Performance information

• Di- and trivalent Bis(stannolediides) of Dysprosium and Terbium: A novel class of High-Performance Single Molecule Magnets　　　　　　　　　　　　　　　
  Peter W. Roesky; Xiaofei Sun; Alexander Hinz; Stefanie Maier; Da Jin; Masaichi Saito; Sören Schlittenhardt; Mario Ruben
  Mar. 2025
  DOI：https://doi.org/10.26434/chemrxiv-2025-dtfmv
  DOI ID：10.26434/chemrxiv-2025-dtfmv, ORCID：179945831
• Synthesis of a dilithiobutadiene bearing extremely bulky silyl substituents and its reactivity toward functionalized silanes　　　　　　　　　　　　　　　
  Katharina Munster; Shunsuke Kudo; Takuya Kuwabara; Eriko Shimamura; Shunsuke Furukawa; Yusuke Yoshida; Shintaro Ishida; Takeaki Iwamoto; Kazuki Tanifuji; Yasuhiro Ohki; Mao Minoura; Masaichi Saito
  DALTON TRANSACTIONS, Volume：54, Number：10, Mar. 2025
  The synthesis and full characterization of 1,4-dilithio-1,4-bis(triisopropylsilyl)-2,3-diphenylbuta-1,3-diene (1b) are reported. This molecule featuring extremely bulky silyl groups at the 1- and 4-positions serves as a precursor for the synthesis of 2,5-bis(triisopropylsilyl)-3,4-diphenyl-1-silacyclopenta-1,3-dienes (siloles) bearing various substituents at the silicon atom (SiR2 = SiH2 (4), SiH(OMe) (5), SiF2 (6), SiBr2 (7), SiBr(OMe) (8)). Importantly, compounds 6 and 7 reacted with lithium to afford 2,5-bis(triisopropylsilyl)-3,4-diphenyldilithiosilole (9). The solid-state molecular structure and solution NMR spectra reveal the formation of an aromatic ring system, as opposed to the precursors 6 and 7, with two Li cations coordinated by the silacycle in eta 5-fashions. The sterically bulky dilithiosilole 9 can be applied as an important starting material in the pursuit of low-valent silicon species without donor stabilization.
  ROYAL SOC CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.1039/d4dt03537b
  DOI ID：10.1039/d4dt03537b, ISSN：1477-9226, eISSN：1477-9234, Web of Science ID：WOS:001416475300001
• Charge Transport through Single-Molecule Junctions with σ-Delocalized Systems　　　　　　　　　　　　　　　
  Shintaro Fujii; Saya Seko; Taichi Tanaka; Yuki Yoshihara; Shunsuke Furukawa; Tomoaki Nishino; Masaichi Saito
  Journal of the American Chemical Society, Jul. 2024
  Scientific journal
  DOI：https://doi.org/10.1021/jacs.4c06732
  DOI ID：10.1021/jacs.4c06732, ORCID：162866972
• Main Group Analogs of Dichalcogeniranes　　　　　　　　　　　　　　　
  Masaichi Saito; Norihiro Tokitoh; Renji Okazaki
  European Journal of Inorganic Chemistry, Apr. 2024
  Scientific journal
  DOI：https://doi.org/10.1002/ejic.202300679
  DOI ID：10.1002/ejic.202300679, ORCID：151016088
• Synthesis of a highly iodinated biphenyl with extension of σ-delocalization　　　　　　　　　　　　　　　
  Yuki Takada; Shunsuke Furukawa; Masaichi Saito
  Chemistry Letters, Mar. 2024
  Scientific journal
  DOI：https://doi.org/10.1093/chemle/upae032
  DOI ID：10.1093/chemle/upae032, ORCID：154102747
• Synthesis of O- and N-substituted pentaiodobenzenes bearing σ-symmetric delocalized orbitals using site-selective nucleophilic aromatic substitution reactions　　　　　　　　　　　　　　　
  Yuki Takada; Mao Minoura; Shunsuke Furukawa; Masaichi Saito
  Chemistry Letters, Feb. 2024
  Scientific journal
  DOI：https://doi.org/10.1093/chemle/upad040
  DOI ID：10.1093/chemle/upad040, ORCID：153818255
• σ-Delocalization between Non-bonded Selenium Atoms on Multiply Se-substituted Benzenes　　　　　　　　　　　　　　　
  Masaichi Saito; Takumi Suzuki; Koki Takahashi; Saya Seko; Shunsuke Furukawa; Kazuya Ishimura
  Chemistry Letters, Volume：52, Number：2, First page：97, Last page：99, Feb. 2023
  The Chemical Society of Japan, English, Scientific journal
  DOI：https://doi.org/10.1246/cl.220489
  DOI ID：10.1246/cl.220489, ISSN：0366-7022, ORCID：139251036
• Activating a [FeFe] Hydrogenase Mimic for Hydrogen Evolution under Visible Light**　　　　　　　　　　　　　　　
  Philipp Buday; Chizuru Kasahara; Elisabeth Hofmeister; Daniel Kowalczyk; Micheal K. Farh; Saskia Riediger; Martin Schulz; Maria Wächtler; Shunsuke Furukawa; Masaichi Saito; Dirk Ziegenbalg; Stefanie Gräfe; Peter Bäuerle; Stephan Kupfer; Benjamin Dietzek‐Ivanšić; Wolfgang Weigand
  Angewandte Chemie International Edition, Volume：61, Number：20, May 2022
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/anie.202202079
  DOI ID：10.1002/anie.202202079, ORCID：110557639
• Ferroelectric columnar assemblies from the bowl-to-bowl inversion of aromatic cores
  Shunsuke Furukawa; Jianyun Wu; Masaya Koyama; Keisuke Hayashi; Norihisa Hoshino; Takashi Takeda; Yasutaka Suzuki; Jun Kawamata; Masaichi Saito; Tomoyuki Akutagawa
  Nature Communications, Volume：12, Number：1, Dec. 2021
  Organic ferroelectrics, in which the constituent molecules retain remanent polarization, represent an important topic in condensed-matter science, and their attractive properties, which include lightness, flexibility, and non-toxicity, are of potential use in state-of-the-art ferroelectric devices. However, the mechanisms for the generation of ferroelectricity in such organic compounds remain limited to a few representative concepts, which has hitherto severely hampered progress in this area. Here, we demonstrate that a bowl-to-bowl inversion of a relatively small organic molecule with a bowl-shaped π-aromatic core generates ferroelectric dipole relaxation. The present results thus reveal an unprecedented concept to produce ferroelectricity in small organic molecules, which can be expected to strongly impact materials science.
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1038/s41467-021-21019-4
  DOI ID：10.1038/s41467-021-21019-4, eISSN：2041-1723, ORCID：88039984
• Transition-Metal Capping to Suppress Back-Donation to Enhance Donor Ability　　　　　　　　　　　　　　　
  Masaichi Saito; Jumpei Hamada; Shunsuke Furukawa; Masahiko Hada; Libor Dostál; Aleš Růžička
  Organometallics, Sep. 2020, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1021/acs.organomet.0c00534
  DOI ID：10.1021/acs.organomet.0c00534, ORCID：80871578
• Hybrid Molecular Junctions Using Au–S and Au−π Bindings　　　　　　　　　　　　　　　
  Shintaro Fujii; Madoka Iwane; Shunsuke Furukawa; Tomofumi Tada; Tomoaki Nishino; Masaichi Saito; Manabu Kiguchi
  The Journal of Physical Chemistry C, Volume：124, Number：17, First page：9261, Last page：9268, Apr. 2020, [Reviewed]
  Electrically conductive molecular junctions are highly desirable components for applications in future molecular-scale electronic circuits. Here, we demonstrate an electrically conductive hybrid molecular junction that consists of Au-S and Au-πbindings using a sumanene derivative with three phosphine-sulfide anchoring groups at the periphery of the sumanene backbone. The molecular junction was prepared between the Au electrodes by the scanning tunneling microscopy-based break junction method. The three anchoring groups and the sumanene backbone in the junction form the Au-S chemical bonds and Au-πdirect bonds, respectively. The Au-S chemical binding immobilized the molecule on the Au electrode and provided the high mechanical stability of the junction, while the direct Au-πbinding led to the large metal-molecule electric coupling and high electronic conductance of the molecular junction. This study analyzes the molecular design of the electrically conductive molecular junctions based on the hybrid binding groups.
  American Chemical Society ({ACS}), Scientific journal
  DOI：https://doi.org/10.1021/acs.jpcc.9b11725
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85085063009&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85085063009&origin=inward
  DOI ID：10.1021/acs.jpcc.9b11725, ISSN：1932-7447, eISSN：1932-7455, ORCID：72294603, SCOPUS ID：85085063009
• Stereoselective thermal isomerization of triphosphasumanenes, utilized for stereocontrolled synthesis　　　　　　　　　　　　　　　
  Yuki Suda; Shunsuke Furukawa; Masaichi Saito
  Chemistry Letters, Volume：49, Number：4, First page：419, Last page：422, Apr. 2020
  We found stereoselective thermal isomerizations at the phosphorous centers of triphosphasumanenes in the solid state. Theoretical calculations and thermal analysis indicate that the isomerization is dominated by the thermodynamic stabilities of crystals depending on the alkoxy groups on their skeleton. The stereoselective isomerization of triphosphasumanene was utilized for the synthesis of a high out-of-plane anisotropic synderivative from a less out-of-plane anisotropic anti-derivative.
  Chemical Society of Japan, English, Scientific journal
  DOI：https://doi.org/10.1246/cl.200032
  DOI ID：10.1246/cl.200032, ISSN：1348-0715, SCOPUS ID：85083728766
• 13C and 207Pb NMR Chemical Shifts of Dirhodio- and Dilithioplumbole Complexes: A Quantum Chemical Assessment　　　　　　　　　　　　　　　
  Radhika Narayanan; Marisa Nakada; Minori Abe; Masaichi Saito; Masahiko Hada
  Inorganic Chemistry, Volume：58, Number：21, First page：14708, Last page：14719, Nov. 2019, [Reviewed]
  Density functional theory (DFT) and zeroth-order regular approximation DFT calculations were performed to investigate the electronic structures and C-13 and Pb-207 nuclear magnetic resonance (NMR) chemical shifts of metal-coordinated plumboles, namely, mono-rhodioplumbole ([Rh-plumbole](-)), dirhodioplumbole (Rh-2-plumbole), and dilithioplumbole (Li-2-plumbole), which have a five-membered ring containing lead. The molecular orbital correlation diagram and extended transition state-natural orbitals for chemical valence analysis of the [Rh-plumbole](-) and Rh-2-plumbole complexes showed that the plumbole is primarily a ir-donor, with Jr-donation being dominant in the Rh-2-plumbole complex. The present calculations show that the Pb-C, internuclear distances are longer in the Rh-2-plumbole complex than in [Rh-plumbole](-)because of the combined effect of strong pi-donation and weak pi-back-donation in the Rh-2-plumbole complex. The calculated Pb-207 and C-13(alpha) NMR chemical shifts agree with the experimental trends reasonably well. The influences of the relativistic effect, role of the functional, effect of the solvent, and dependence of the exact exchange admixture on the calculated Pb-207 and C-13(alpha) NMR chemical shifts were investigated. The NMR chemical shift trend of the Pb-207 atom in the complexes originates from the paramagnetic and spin-orbit contributions. NMR component analysis revealed that the upfield shift of the C-13(alpha) atoms of the [Rh-plumbole](-) and Rh-2-plumbole complexes compared to that of the Li-2-plumbole complex is mainly due to the decrease in the paramagnetic term.
  American Chemical Society ({ACS}), English, Scientific journal
  DOI：https://doi.org/10.1021/acs.inorgchem.9b02367
  DOI ID：10.1021/acs.inorgchem.9b02367, ISSN：0020-1669, eISSN：1520-510X, ORCID：63446599, Web of Science ID：WOS:000494894400046
• Synthesis and properties of perfluoroalkylated TIPS-pentacenes　　　　　　　　　　　　　　　
  Tomohiro Agou; Seima Suzuki; Yasunori Kanno; Takaaki Hosoya; Hiroki Fukumoto; Yoshiyuki Mizuhata; Norihiro Tokitoh; Yuki Suda; Shunsuke Furukawa; Masaichi Saito; Toshio Kubota
  Tetrahedron, First page：130678, Last page：130678, Nov. 2019, [Reviewed]
  Elsevier {BV}, Scientific journal
  DOI：https://doi.org/10.1016/j.tet.2019.130678
  DOI ID：10.1016/j.tet.2019.130678, ORCID：62811686
• Inverted Sandwich Rh Complex Bearing a Plumbole Ligand and Its Catalytic Activity　　　　　　　　　　　　　　　
  Masaichi Saito; Marisa Nakada; Takuya Kuwabara; Ryota Owada; Shunsuke Furukawa; Radhika Narayanan; Minori Abe; Masahiko Hada; Ken Tanaka; Yoshihiko Yamamoto
  Organometallics, Volume：38, Number：16, First page：3099, Last page：3103, Aug. 2019, [Reviewed]
  A new possibility of a Rh(I) complex is demonstrated. An inverted sandwich Rh(I) complex bearing a dianionic plumbole ligand was synthesized by the reaction a dilithioplumbole with [Rh(cod)Cl](2). The plumbole ligand functions as a pi-donor stronger than the cyclopentadienyl ligand, as evidenced by quantum-chemical calculations. The Rh(I)-plumbole complex can be applied as a catalyst for an intramolecular [2+2+2] cycloaddition reaction of a triyne.
  American Chemical Society ({ACS}), English, Scientific journal
  DOI：https://doi.org/10.1021/acs.organomet.9b00339
  DOI ID：10.1021/acs.organomet.9b00339, ISSN：0276-7333, eISSN：1520-6041, ORCID：59307624, Web of Science ID：WOS:000483435900001
• Anionic Ferrocene and its Unique Electronic State　　　　　　　　　　　　　　　
  Masaichi Saito; Naoki Matsunaga; Jumpei Hamada; Shunsuke Furukawa; Tomofumi Tada; and Rolfe H. Herber
  Chem. Lett., Volume：48, First page：163, Last page：165, Jan. 2019, [Reviewed], ［International magazine］
  English
  DOI：https://doi.org/10.1246/cl.180880
  DOI ID：10.1246/cl.180880
• Double aromaticity arising from σ- and π-rings
  Shunsuke Furukawa; Masahiro Fujita; Yoshihiko Kanatomi; Mao Minoura; Miho Hatanaka; Keiji Morokuma; Kazuya Ishimura; Masaichi Saito
  Communications Chemistry, Volume：1, Number：1, Dec. 2018, [Reviewed]
  Springer Nature, Scientific journal
  DOI：https://doi.org/10.1038/s42004-018-0057-4
  DOI ID：10.1038/s42004-018-0057-4, eISSN：2399-3669, ORCID：48482451
• Transition-Metal Complexes Featuring Dianionic Heavy Group 14 Element Aromatic Ligands　　　　　　　　　　　　　　　
  Masaichi Saito
  Accounts of Chemical Research, Volume：51, Number：1, First page：160, Last page：169, Jan. 2018, [Reviewed]
  American Chemical Society ({ACS}), Scientific journal
  DOI：https://doi.org/10.1021/acs.accounts.7b00367
  DOI ID：10.1021/acs.accounts.7b00367, ORCID：39834854
• Heterobimetallic triple-decker complexes derived from a dianionic aromatic stannole ligand　　　　　　　　　　　　　　　
  Masaichi Saito; Naoki Matsunaga; Jumpei Hamada; Shunsuke Furukawa; Mao Minoura; Susann Wegner; Juri Barthel; Christoph Janiak
  Dalton Transactions, Volume：47, Number：27, First page：8892, Last page：8896, 2018, [Reviewed]
  A neutral heterobimetallic triple-decker stannole complex was prepared by the reaction of an anionic ruthenocene bearing a stannole dianionic ligand with [Rh(cod)Cl]2 (cod = 1,5-cyclooctadiene), and the resulting Ru-Rh complex exhibits an electronic property different from those of the corresponding Ru-Ru and Rh-Rh complexes. The Ru-Rh complex can be decomposed in ionic liquids to metal nanoparticles.
  Royal Society of Chemistry ({RSC}), Scientific journal
  DOI：https://doi.org/10.1039/C8DT01455H
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85049339612&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85049339612&origin=inward
  DOI ID：10.1039/C8DT01455H, ISSN：1477-9226, eISSN：1477-9234, ORCID：44839235, PubMed ID：29774331, SCOPUS ID：85049339612
• Synthesis and properties of spiro-type heterasumanenes containing group 14 elements as bridging atoms　　　　　　　　　　　　　　　
  Shunsuke Furukawa; Keisuke Hayashi; Ken Yamagishi; Masaichi Saito
  Materials Chemistry Frontiers, 2018, [Reviewed]
  Royal Society of Chemistry ({RSC}), Scientific journal
  DOI：https://doi.org/10.1039/C7QM00590C
  DOI ID：10.1039/C7QM00590C, ORCID：41948373
• Figuration of bowl-shaped π-conjugated molecules: properties and functions　　　　　　　　　　　　　　　
  Masaichi Saito; Hiroshi Shinokubo; Hidehiro Sakurai
  Materials Chemistry Frontiers, 2018, [Reviewed]
  Royal Society of Chemistry ({RSC}), Scientific journal
  DOI：https://doi.org/10.1039/C7QM00593H
  DOI ID：10.1039/C7QM00593H, ORCID：41776408
• Synthesis and Structures of Sterically Encumbered Group 14 Monolithio Compounds and Unexpected Differences in Their Reactivity　　　　　　　　　　　　　　　
  Lucian-Cristian Pop; Nobuaki Kurokawa; Hiroaki Ebata; Katsuya Tomizawa; Tomoyuki Tajima; Masaichi Saito
  European Journal of Inorganic Chemistry, Nov. 2017, [Reviewed]
  Wiley-Blackwell, Scientific journal
  DOI：https://doi.org/10.1002/ejic.201700945
  DOI ID：10.1002/ejic.201700945, ORCID：38951480
• Relativistic Effect on 1 J (M,C) in Me4 M, Me3 M− , Ph4 M, and Ph3 M− (M=Pb, Sn, Ge, Si, and/or C): Role of s-Type Lone Pair Orbitals in the Distinct Effect for the Anionic Species　　　　　　　　　　　　　　　
  Satoko Hayashi; Taro Nishide; Waro Nakanishi; Masaichi Saito
  ChemPhysChem, Volume：18, Number：18, First page：2466, Last page：2474, Sep. 2017, [Reviewed]
  Wiley-Blackwell, Scientific journal
  DOI：https://doi.org/10.1002/cphc.201700755
  DOI ID：10.1002/cphc.201700755, ORCID：38951479
• Anisotropic Crystals Based on a Main-Group Coordination Polymer with Alignment of Rigid π Skeletons　　　　　　　　　　　　　　　
  Masaichi Saito; Tomoki Akiba; Shunsuke Furukawa; Mao Minoura; Masahiko Hada; Hiroshi Y. Yoshikawa
  Organometallics, Volume：36, Number：14, First page：2487, Last page：2490, Jul. 2017, [Reviewed]
  We succeeded in the alignment of π skeletons, resulting in the formation of anisotropic crystals. The combination of plumbacyclopentadienylidene, which has a divalent lead atom incorporated into the π skeleton, and 1,4-dioxane afforded a coordination polymer, where the π skeletons are completely aligned in the same direction. The resulting plumbylene chains are also aligned in the same direction in the solid state, and therefore the crystals are noncentrosymmetric, showing second-harmonic generation (SHG) properties. Using pyrazine instead of 1,4-dioxane afforded an adduct composed of three plumbole units and two pyrazine molecules, and the crystals are symmetric and exhibit no SHG properties. The solid-state structures and optical properties are highly dependent on the Lewis base utilized. The present findings spotlight the use of group 14 divalent species incorporated into a π skeleton as a novel, useful method for the creation of a π-aligned coordination polymer with NLO properties.
  American Chemical Society ({ACS}), Scientific journal
  DOI：https://doi.org/10.1021/acs.organomet.7b00217
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85025679539&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85025679539&origin=inward
  DOI ID：10.1021/acs.organomet.7b00217, ISSN：0276-7333, eISSN：1520-6041, ORCID：38951478, SCOPUS ID：85025679539, Web of Science ID：WOS:000406435600004
• Triphosphasumanene Trisulfide: High Out-of-Plane Anisotropy and Janus-Type pi-Surfaces　　　　　　　　　　　　　　　
  Furukawa, Shunsuke; Suda, Yuki; Kobayashi, Junji; Kawashima, Takayuki; Tada, Tomofumi; Fujii, Shintaro; Kiguchi, Manabu; Saito, Masaichi
  Journal of the American Chemical Society, Volume：139, Number：16, First page：5787, Last page：5792, 2017, [Reviewed]
  A triphosphasumanene trisulfide was designed and synthesized as an out-of-plane anisotropic π-conjugated molecule. Incorporating three anisotropic phosphine sulfide moieties into a sumanene skeleton induced a cumulative anisotropy with a large dipole moment (12.0 D), which is aligned in perpendicular direction with respect to the π-framework and more than twice as large as those of conventional out-of-plane anisotropic molecules. In the crystal, the molecules align to form columnar structures, in which electron-rich and electron-deficient sides of the π-framework face each other. The interactions between the electron-rich surfaces, which contain three sulfur atoms, and Au(111) were examined by X-ray photoelectron spectroscopy.
  Scientific journal
  DOI：https://doi.org/10.1021/jacs.6b12119
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85018319574&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85018319574&origin=inward
  DOI ID：10.1021/jacs.6b12119, ISSN：0002-7863, eISSN：1520-5126, ORCID：36958863, PubMed ID：28387119, SCOPUS ID：85018319574, Web of Science ID：WOS:000400321500032
• Synthesis and reactivity of a ruthenocene-type complex bearing an aromatic π-ligand with the heaviest group 14 element　　　　　　　　　　　　　　　
  Marisa Nakada; Takuya Kuwabara; Shunsuke Furukawa; Masahiko Hada; Mao Minoura; Masaichi Saito
  Chemical Science, Volume：8, Number：4, First page：3092, Last page：3097, 2017, [Reviewed]
  An anionic ruthenocene derived from a dilithioplumbole complex was prepared. In the complex, the plumbole ligand coordinates a ruthenium atom in an η5-fashion, similar to the cyclopentadienyl ligand in ferrocene. The ruthenocene that has the aromatic π-ligand with the heaviest group 14 element reacted with electrophiles to afford the plumbole complexes wherein the plumbole ligands show deviation from planarity, in contrast to the planar plumbole ring in the anionic ruthenocene. The bent angles of the plumbole ligands are dependent on the substituents on the lead atoms. Cyclic voltammetry measurements revealed that the plumbole complexes are oxidized more easily than the corresponding stannole complexes.
  Royal Society of Chemistry ({RSC}), Scientific journal
  DOI：https://doi.org/10.1039/C6SC04843A
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85016458912&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85016458912&origin=inward
  DOI ID：10.1039/C6SC04843A, ISSN：2041-6520, eISSN：2041-6539, ORCID：38951477, SCOPUS ID：85016458912, Web of Science ID：WOS:000397560500073
• Reactions of Dilithium Dibenzopentalenides with Cr(CO)(3)(CH3CN)(3): Unexpected Formation of a Cubic Tetramer of an Anionic Hydrodibenzopentalenyl Complex　　　　　　　　　　　　　　　
  Kuwabara, Takuya; Kurokawa, Nobuaki; Saito, Masaichi
  Chempluschem, Volume：82, Number：7, 2017, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1002/cplu.201700043
  DOI ID：10.1002/cplu.201700043, ORCID：36958861, Web of Science ID：WOS:000407021400014
• Formation of Dibenzopentalene-linking Polymers under the Two-zone CVD and Wet Conditions　　　　　　　　　　　　　　　
  Saito, Masaichi; Suda, Yuki; Furukawa, Shunsuke; Nakae, Takahiro; Kojima, Takahiro; Sakaguchi, Hiroshi
  Chemistry Letters, Volume：46, Number：8, 2017, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1246/cl.170396
  DOI ID：10.1246/cl.170396, ORCID：36958860, Web of Science ID：WOS:000404524400012
• Efficient Synthesis of 1,4-Bis-heteroatom-substituted Tetraselanylbenzenes via 1,4-Dilithiation of Hexaselanylbenzene and Investigation on Their Electronic Properties　　　　　　　　　　　　　　　
  Fujita, Masahiro; Furukawa, Shunsuke; Saito, Masaichi
  Chemistry-an Asian Journal, Volume：12, Number：9, 2017, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1002/asia.201700164
  DOI ID：10.1002/asia.201700164, ORCID：36958859, Web of Science ID：WOS:000400712400004
• The Chemistry of Heterasumanenes　　　　　　　　　　　　　　　
  Saito, Masaichi; Furukawa, Shunsuke; Kobayashi, Junji; Kawashima, Takayuki
  Chemical Record, Volume：16, Number：1, First page：64, Last page：72, 2016, [Reviewed]
  Our studies on the synthesis of heterasumanenes, where benzylic carbon atoms of the sumanene are replaced by heteroatom functionalities, are summarized. Starting from triphenylene, repetitive lithiation at a bay position followed by introduction of silylene or germylene units provided the first trisila- and trigermasumanenes with no substituents on the skeletal carbon atoms. The synthesis of a trisilasumanene bearing six butoxy groups on the skeletal carbon atoms was also accomplished by our original sila-Friedel-Crafts reaction. A heterasumanene bearing three different heteroatom functionalities was also prepared from triphenylenothiophene by a sequential lithiation method, even though protecting groups were necessary to prevent lithiation at the -carbon atoms of the dibenzothiophene unit. Structural analysis and optical properties of the novel heterasumanenes are also described.
  WILEY-V C H VERLAG GMBH, English, Scientific journal
  DOI：https://doi.org/10.1002/tcr.201500211
  DOI ID：10.1002/tcr.201500211, ISSN：1527-8999, eISSN：1528-0691, ORCID：36958866, Web of Science ID：WOS:000371261600006
• Soft wet-chemical synthesis of Ru-Sn nanoparticles from single-source ruthenocene-stannole precursors in an ionic liquid　　　　　　　　　　　　　　　
  Wegner, Susann; Saito, Masaichi; Barthel, Juni; Janiak, Christoph
  Journal of Organometallic Chemistry, Volume：821, 2016, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1016/j.jorganchem.2016.05.010
  DOI ID：10.1016/j.jorganchem.2016.05.010, ORCID：36958865, Web of Science ID：WOS:000387633400024
• (eta(4)-Butadiene)Sn(0) Complexes: A New Approach for Zero-Valent p-Block Elements Utilizing a Butadiene as a 4 pi-Electron Donor　　　　　　　　　　　　　　　
  Kuwabara, Takuya; Nakada, Marisa; Hamada, Jumpei; Guo, Jing Dong; Nagase, Shigeru; Saito, Masaichi
  Journal of the American Chemical Society, Volume：138, Number：35, 2016, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1021/jacs.6b07304
  DOI ID：10.1021/jacs.6b07304, ORCID：36958864, Web of Science ID：WOS:000382901800051
• Synthesis of a Stannole Dianion Complex Bearing a mu-eta(1);eta(1)-Coordination Mode: Different Electronic State of Stannole Dianion Ligands Depending on Their Hapticity　　　　　　　　　　　　　　　
  Kuwabara, Takuya; Saito, Masaichi
  Organometallics, Volume：34, Number：17, 2015, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1021/acs.organomet.5b00614
  DOI ID：10.1021/acs.organomet.5b00614, ORCID：36958614, Web of Science ID：WOS:000361341800005
• Diverse coordination modes in tin analogues of a cyclopentadienyl anion depending on the substituents on the tin atom　　　　　　　　　　　　　　　
  Kuwabara, T.; Nakada, M.; Guo, J. D.; Nagase, S.; Saito, M.
  Dalton Transactions, Volume：44, Number：37, 2015, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1039/c5dt02202a
  DOI ID：10.1039/c5dt02202a, ORCID：36958613, Web of Science ID：WOS:000361544500011
• A reversible two-electron redox system involving a divalent lead species　　　　　　　　　　　　　　　
  Saito, Masaichi; Nakada, Marisa; Kuwabara, Takuya; Minoura, Mao
  Chemical Communications, Volume：51, Number：22, First page：4674, Last page：4676, 2015, [Reviewed]
  Reduction of THF-stabilized plumbacyclopentadienylidene with lithium afforded dilithioplumbole. On the other hand, oxidation of the dilithioplumbole provided the starting plumbacyclopentadienylidene. This is the unprecedented example of a reversible interconversion between group 14 M(ii) and its dianionic species bearing organic substituents. This journal is
  Scientific journal
  DOI：https://doi.org/10.1039/c4cc09856k
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84929377916&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84929377916&origin=inward
  DOI ID：10.1039/c4cc09856k, ISSN：1359-7345, eISSN：1364-548X, ORCID：36958612, SCOPUS ID：84929377916, Web of Science ID：WOS:000350486300031
• Unexpected Dehalogenation Reactions of Dichloroborane Bearing a NCN-Pincer Ligand: Formation of a Borenium Salt　　　　　　　　　　　　　　　
  Saito, Masaichi; Matsumoto, Kaori; Fujita, Masahiro; Minoura, Mao
  Heteroatom Chemistry, Volume：25, Number：5, First page：354, Last page：360, 2014, [Reviewed]
  2,6-Bis, has two 1stannacyclopentadiene skeletons related by inversion symmetry located at the mid-point of the Sn-Sn bond [2.7682 (2) angstrom]. Thus, the asymmetric unit comprises one half-molecule. The planarity of the stannacyclopentadiene ring is illustrated by the dihedral angle of 0.3 (1)degrees, defined by the C(4) and C-Sn-C planes. To avoid steric repulsion, the two stannole rings are oriented in an anti fashion through the Sn-Sn bond. These structural features are similar to those of other bistannoles.
  WILEY-BLACKWELL, English, Scientific journal
  DOI：https://doi.org/10.1107/S1600536811022951
  DOI ID：10.1107/S1600536811022951, ISSN：1600-5368, Web of Science ID：WOS:000294663000099
• 1,5-Bis[2,6-bis(2,4,6-triisopropylphenyl)phenyl]-2,3,4,6,7-pentatellura-1,5-distannabicyclo[3.1.1]heptane　　　　　　　　　　　　　　　
  Masaichi Saito; Hizuru Hashimoto; Tomoyuki Tajima
  ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, Volume：66, Number：Pt 8, First page：M885, Last page：U273, Aug. 2010, [Reviewed]
  The title compound, [Sn(2)(C(72)H(98))Te(2)(Te(3))], has a cage-like structure with bulky aryl substituents on the Sn atoms. The molecule sits over a crystallographic twofold axis, and hence the asymmetric unit consists of one half-molecule. Due to the twofold axis, the tritelluride part has a 1:1 disorder. One of the six-membered rings has a boat conformation, whereas the other has a chair conformation. The ditelluradistannane ring has a bent structure, with a dihedral angle of 32.89 (2)degrees between the two Te-Sn-Te planes.
  WILEY-BLACKWELL PUBLISHING, INC, English, Scientific journal
  DOI：https://doi.org/10.1107/S1600536810025729
  DOI ID：10.1107/S1600536810025729, ISSN：1600-5368, PubMed ID：21588131, Web of Science ID：WOS:000282468400024
• Synthesis and Structures of Lithium Salts of Stannole Anions　　　　　　　　　　　　　　　
  Masaichi Saito; Takuya Kuwabara; Kazuya Ishimura; Shigeru Nagase
  Bulletin of the Chemical Society of Japan, Volume：83, Number：7, First page：825, Last page：827, Jul. 2010
  The Chemical Society of Japan, Scientific journal
  DOI：https://doi.org/10.1246/bcsj.20100057
  DOI ID：10.1246/bcsj.20100057, ISSN：0009-2673, eISSN：1348-0634
• Synthesis, Structure, and Reaction of Tetraethyldilithiostannole　　　　　　　　　　　　　　　
  Masaichi Saito; Takuya Kuwabara; Chika Kambayashi; Michikazu Yoshioka; Kazuya Ishimura; Shigeru Nagase
  Chemistry Letters, Volume：39, Number：7, First page：700, Last page：701, Jul. 2010
  The Chemical Society of Japan, Scientific journal
  DOI：https://doi.org/10.1246/cl.2010.700
  DOI ID：10.1246/cl.2010.700, ISSN：0366-7022, eISSN：1348-0715
• Synthesis, Structures, and Properties of Plumboles
  Masaichi Saito; Masafumi Sakaguchi; Tomoyuki Tajima; Kazuya Ishimura; Shigeru Nagase
  Phosphorus, Sulfur, and Silicon and the Related Elements, Volume：185, Number：5-6, First page：1068, Last page：1076, May 2010
  Informa UK Limited, Scientific journal
  DOI：https://doi.org/10.1080/10426501003773399
  DOI ID：10.1080/10426501003773399, ISSN：1042-6507, eISSN：1563-5325
• Formation of Pentaorganostannates from Bis(2-bromo-2 '-biphenyl)stannanes and tert-Butyllithium upon Substitution of Alkyl and Aryl Groups on Tin Atoms　　　　　　　　　　　　　　　
  Masaichi Saito; Sanae Imaizumi; Tomoyuki Tajima
  EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Number：14, First page：2153, Last page：2157, May 2010, [Reviewed]
  The reaction of bis(2-bromo-2'-biphenyl)stannanes 1 with tert-butyllithium in the presence of diaryl- and dialkyldichlorostannanes leads to the extrusion of aryl and alkyl groups on the tin atom, affording 9-stannafluorene derivatives bearing biphenyl groups. The intermediates of the reactions were assigned to the corresponding pentaorganostannates, which were characterized by NMR spectroscopy. Unexpectedly, the dissociation of the aryl and alkyl groups from the tin atoms in intramolecular nucleophilic substitution reactions was preferable to that of chloride ions in intermolecular nucleophilic substitution reactions.
  WILEY-BLACKWELL, English, Scientific journal
  DOI：https://doi.org/10.1002/ejic.201000089
  DOI ID：10.1002/ejic.201000089, ISSN：1434-1948, Web of Science ID：WOS:000278343400007
• Arching a bay area of triphenyleno[1,12-bcd]thiophene with group 14 functionalities: Synthesis of the first triphenylene derivatives having thiophene and metallafluorene moieties　　　　　　　　　　　　　　　
  Masaichi Saito; Tomoharu Tanikawa; Tomoyuki Tajima; Jing Dong Guo; Shigeru Nagase
  JOURNAL OF ORGANOMETALLIC CHEMISTRY, Volume：695, Number：7, First page：1035, Last page：1041, Apr. 2010, [Reviewed]
  Arching a bay area of triphenyleno[1,12-bcd]thiophene with group 14 functionalities gave the first triphenylene derivatives whose two pairs of bay carbons are connected by two different heteroatom functionalities. Triphenyleno[1,12-bcd:4,5-b'c'd']dithiophene, which had been only accessible through the very severe reaction conditions, was synthesized under the mild reaction conditions. Photophysical properties of newly-obtained heterolotriphenylene derivatives are discussed with theoretical calculations. (C) 2009 Elsevier B. V. All rights reserved.
  ELSEVIER SCIENCE SA, English, Scientific journal
  DOI：https://doi.org/10.1016/j.jorganchem.2009.11.039
  DOI ID：10.1016/j.jorganchem.2009.11.039, ISSN：0022-328X, Web of Science ID：WOS:000275619800022
• Dilithioplumbole: A Lead-Bearing Aromatic Cyclopentadienyl Analog　　　　　　　　　　　　　　　
  Masaichi Saito; Masafumi Sakaguchi; Tomoyuki Tajima; Kazuya Ishimura; Shigeru Nagase; Masahiko Hada
  SCIENCE, Volume：328, Number：5976, First page：339, Last page：342, Apr. 2010
  Although the concept of aromaticity has long played an important role in carbon chemistry, it has been unclear how applicable the stabilizing framework is to the heaviest elements. Here we report the synthesis of dilithiotetraphenylplumbole by reduction of hexaphenylplumbole. X-ray crystallography revealed a planar structure with no alternation of carbon-carbon bond lengths in the five-membered ring core. Nuclear magnetic resonance spectra and relativistic theoretical calculations show considerable aromatic character in the molecule, thus extending aromaticity to carbon's heaviest congener.
  AMER ASSOC ADVANCEMENT SCIENCE, English, Scientific journal
  DOI：https://doi.org/10.1126/science.1183648
  DOI ID：10.1126/science.1183648, ISSN：0036-8075, Web of Science ID：WOS:000276685000032
• Synthesis and structures of heterasumanenes having different heteroatom functionalities　　　　　　　　　　　　　　　
  Masaichi Saito; Tomoharu Tanikawa; Tomoyuki Tajima; Jing Dong Guo; Shigeru Nagase
  TETRAHEDRON LETTERS, Volume：51, Number：4, First page：672, Last page：675, Jan. 2010, [Reviewed]
  After the protection of two alpha-carbons of the dibenzothiophene moiety in triphenylenothiophene 1 by trimethylsilyl groups, the resulting compound 4 reacted with butyllithium followed by dichlorodimethylsilane to afford 10H-silolo[2',3',4',5':4,5]triphenyleno[1,12-bcd]thiophene 8, which reacted with butyllithium followed by dichlorodimethylsilane to afford novel heterasumanene 11. Using dichlorodimethylstannane instead of dichlorodimethylsilane afforded heterasumanene 12, which is the first example of a heterasumanene having three different heteroatom functionalities. (C) 2009 Elsevier Ltd. All rights reserved.
  PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
  DOI：https://doi.org/10.1016/j.tetlet.2009.11.102
  DOI ID：10.1016/j.tetlet.2009.11.102, ISSN：0040-4039, Web of Science ID：WOS:000274885600027
• Synthesis and structure of the dithienostannole anion　　　　　　　　　　　　　　　
  Masaichi Saito; Munenori Shiratake; Tomoyuki Tajima; Jing Dong Guo; Shigeru Nagase
  JOURNAL OF ORGANOMETALLIC CHEMISTRY, Volume：694, Number：25, First page：4056, Last page：4061, Dec. 2009, [Reviewed]
  Novel dithienostannoles were synthesized by the reactions of the corresponding dilithiobithiophenes with dichlorodiphenylstannane. A unique byproduct, 10-membered ring compound was also obtained. Reduction of type A dithienostannole with lithium afforded 2,2'-dilithio-3,3'-bithiophene, while reduction of type B dithienostannole with lithium afforded the corresponding dithienostannole anion. The structure and aromaticity of the dithienostannole anion are also discussed. (C) 2009 Elsevier B. V. All rights reserved.
  ELSEVIER SCIENCE SA, English, Scientific journal
  DOI：https://doi.org/10.1016/j.jorganchem.2009.08.026
  DOI ID：10.1016/j.jorganchem.2009.08.026, ISSN：0022-328X, Web of Science ID：WOS:000271099500011
• New reactions of a dibenzo[a,e]pentalene　　　　　　　　　　　　　　　
  Masaichi Saito; Michio Nakamura; Tomoyuki Tajima
  CHEMISTRY-A EUROPEAN JOURNAL, Volume：14, Number：20, First page：6062, Last page：6068, 2008, [Reviewed]
  Reduction of dibenzo[a,e]pentalene 3 (denoted as dibenzopentalene hereafter) with excess lithium gave dilithium dibenzopentalenide 1. Since oxidation of I with iodine gave 3, redox behavior between 1 and 3 is controllable and reversible. Reaction of 3 with methyllithium gave lithium 5-methyldibenzopehtalenide 5, the formation of which was evidenced by some trapping experiments and X-ray crystallographic analysis. Reactions of 3 with halogens gave 5,10-dihalodibenzopentalenes, 8 and 9. Some optical properties of novel dibenzopentalene derivatives are also demonstrated.
  WILEY-BLACKWELL, English, Scientific journal
  DOI：https://doi.org/10.1002/chem.200800451
  DOI ID：10.1002/chem.200800451, ISSN：0947-6539, Web of Science ID：WOS:000257822500008
• Synthesis, structure and reactions of a trianion equivalent, trilithiostannane
  Tomoyuki Tajima; Masatoshi Ikeda; Masaichi Saito; Kazuya Ishimura; Shigeru Nagase
  Chemical Communications, Number：48, First page：6495, Last page：6495, 2008
  Royal Society of Chemistry (RSC), Scientific journal
  DOI：https://doi.org/10.1039/b815371j
  DOI ID：10.1039/b815371j, ISSN：1359-7345, eISSN：1364-548X
• Synthesis and Structure of Pentaorganostannate Having Five Carbon Substituents
  Masaichi Saito; Sanae Imaizumi; Tomoyuki Tajima; Kazuya Ishimura; Shigeru Nagase
  Journal of the American Chemical Society, Volume：129, Number：36, First page：10974, Last page：10975, Sep. 2007
  American Chemical Society (ACS), Scientific journal
  DOI：https://doi.org/10.1021/ja072478+
  DOI ID：10.1021/ja072478+, ISSN：0002-7863, eISSN：1520-5126
• Synthesis and reactions of a novel bulky aryllithium　　　　　　　　　　　　　　　
  Masaichi Saito; Yuta Okuyama; Tomoyuki Tajima; Daichi Kato; Michikazu Yoshioka
  APPLIED ORGANOMETALLIC CHEMISTRY, Volume：21, Number：7, First page：604, Last page：611, Jul. 2007, [Reviewed]
  A novel bulky aryllithium, 2,6-bis{2,5-bis[bis(trimethylsilyl)methyl]phenyl}phenyllithium (BbspLi), was synthesized. Reactions of BbspLi 5 with Group 14 electrophiles, such as stannous chloride, with carbon tetrachloride or tetrachlorometallanes gave fluorene 6. Reaction of BbspLi with carbon tetrachloride gave benzyl chloride 8, which converted to 6 under acidic conditions. BbspLi 5 isomerized to the corresponding benzyl anion 10, which underwent halophilic reactions with Group 14 electrophiles to give fluorene 6 via the benzyl chloride intermediate 8. Copyright (c) 2007 John Wiley & Sons, Ltd.
  JOHN WILEY & SONS LTD, English, Scientific journal
  DOI：https://doi.org/10.1002/aoc.1268
  DOI ID：10.1002/aoc.1268, ISSN：0268-2605, Web of Science ID：WOS:000247974400016
• 3,5-Bis(trimethylsilyl)triphenyleno[1,12bcd]thiophene　　　　　　　　　　　　　　　
  Masaichi Saito; Tomoharu Tanikawa; Tomoyuki Tajima
  ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, Volume：63, First page：O2923, Last page：U2631, Jun. 2007, [Reviewed]
  In the title compound, C24H26SSi2, the fused ring system plus the two Si atoms are coplanar, consistent with planar triphenylene but contrary to bowl-shaped triphenyleno[1,12-bcd:4,5-b'c'd':8,9-b '' c '' d '']-trithiophene. The bond alternation pattern of the C-C bonds in the title compound is similar to that found in triphenyleno[1,12-bcd:4,5-b'c'd':8,9-b '' c '' d '']-trithiophene, although the lengths of the C-C bonds around the central and thiophene rings of the title compound are slightly different from the corresponding bonds of triphenyleno[1,12-bcd:4,5-b'c'd':8,9-b '' c '' d '']-trithiophene.
  BLACKWELL PUBLISHING, English, Scientific journal
  DOI：https://doi.org/10.1107/S1600536807022337
  DOI ID：10.1107/S1600536807022337, ISSN：1600-5368, Web of Science ID：WOS:000248118400271
• Synthesis and structures of polychalcogenadistannabicyclo[k.l.m]alkanes　　　　　　　　　　　　　　　
  Masaichi Saito; Hizuru Hashimoto; Tomoyuki Tajima; Masatoshi Ikeda
  JOURNAL OF ORGANOMETALLIC CHEMISTRY, Volume：692, Number：13, First page：2729, Last page：2735, Jun. 2007, [Reviewed]
  Reaction of steric encumbered trichlorostannane with disodium sulfide or dilithium selenide gave 2,4-dimercapto-1,3,2,4-dithiadistannetane or tetraselenadistannabicyclo[2.1.1]hexane, respectively. Reactions of steric encumbered trihydrostannane with elemental chalcogens gave pentachalcogenadistannabicyclo[k.1.1]heptanes (k = 2 and 3). The two bridgehead tin atoms of the first polychalcogenadistannabicyclo[k.l.m]alkanes are concluded to have no significant bonding interaction, judging from the longer bond distances than those of the normal tin-tin single bonds. (c) 2007 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE SA, English, Scientific journal
  DOI：https://doi.org/10.1016/j.jorganchem.2007.02.004
  DOI ID：10.1016/j.jorganchem.2007.02.004, ISSN：0022-328X, Web of Science ID：WOS:000247420200014
• Reduction of phenyl silyl acetylenes with lithium: Unexpected formation of a dilithium dibenzopentalenide　　　　　　　　　　　　　　　
  Masaichi Saito; Michio Nakamura; Tomoyuki Tajima; Michikazu Yoshioka
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Volume：46, Number：9, First page：1504, Last page：1507, 2007, [Reviewed]
  WILEY-V C H VERLAG GMBH, English, Scientific journal
  DOI：https://doi.org/10.1002/anie.200604067
  DOI ID：10.1002/anie.200604067, ISSN：1433-7851, PubMed ID：17387657, Web of Science ID：WOS:000244507100029
• Synthesis and Characterization of Dimetallostannafluorenes　　　　　　　　　　　　　　　
  Masaichi Saito; Masakazu Shimosawa; Michikazu Yoshioka; Kazuya Ishimura; Shigeru Nagase
  Chemistry Letters, Volume：35, Number：8, First page：940, Last page：941, Aug. 2006
  The Chemical Society of Japan, Scientific journal
  DOI：https://doi.org/10.1246/cl.2006.940
  DOI ID：10.1246/cl.2006.940, ISSN：0366-7022, eISSN：1348-0715
• Synthesis of Stannaindenyl Anions and a Dianion
  Masaichi Saito; Masakazu Shimosawa; Michikazu Yoshioka; Kazuya Ishimura; Shigeru Nagase
  Organometallics, Volume：25, Number：12, First page：2967, Last page：2971, Jun. 2006
  American Chemical Society (ACS), Scientific journal
  DOI：https://doi.org/10.1021/om050879x
  DOI ID：10.1021/om050879x, ISSN：0276-7333, eISSN：1520-6041
• The Aromaticity of the Stannole Dianion
  Masaichi Saito; Ryuta Haga; Michikazu Yoshioka; Kazuya Ishimura; Shigeru Nagase
  Angewandte Chemie International Edition, Volume：44, Number：40, First page：6553, Last page：6556, Oct. 2005, [Reviewed]
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/anie.200501632
  DOI ID：10.1002/anie.200501632, ISSN：1433-7851, eISSN：1521-3773, ORCID：80220519
• Formation of the Dianion and the Dimer of 9, 10-Distannaanthracene　　　　　　　　　　　　　　　
  SAITO Masaichi; HENZAN Natsumi; YOSHIOKA Michikazu
  Chemistry Letters, Volume：34, Number：7, First page：1018, Last page：1019, Jul. 2005
  The reaction of 9,10-diiodo-9,10-dihydro-9,10-distannaanthracene with lithium naphthalenide (2.5 equiv.) or excess lithium gave the 9,10-distannaanthracene dimer or the 9,10-distannaanthracene dianion. The formation of the latter was evidenced by NMR spectral analysis and a trapping experiment.
  The Chemical Society of Japan, English
  DOI：https://doi.org/10.1246/cl.2005.1018
  DOI ID：10.1246/cl.2005.1018, ISSN：0366-7022, CiNii Articles ID：10016469338, CiNii Books ID：AA00603318
• Tin-chalcogen double-bond compounds, stannanethione and stannaneselone: Synthesis, structure, and reactivities　　　　　　　　　　　　　　　
  M Saito; N Tokitoh; R Okazaki
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Volume：126, Number：47, First page：15572, Last page：15582, Dec. 2004, [Reviewed]
  The first isolation of diarylstannanethione (tin-sulfur double-bond compound) and diarylstannaneselone (tin-selenium double-bond compound), Tbt(Ditp)Sn=X (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl; Ditp = 2,2"-diisopropyl-m-terphenyl-2'-yl; X = S and Se) was accomplished by dechalcogenation of the corresponding highly hindered tetrachalcogenastannolanes, Tbt(Ditp)SnX4. The Sn-119 NMR of stannanethione, Tbt(Ditp)Sn=S, and stannaneselone, Tbt(Ditp)Sn=Se, showed only one low-field broad signal at 531 and 440 ppm, respectively, characteristic of a tricoordinated tin, and hence, the stannanethione and stannaneselone display an intrinsic nature of tin-chalcogen double-bond compounds. The X-ray crystallographic analysis of the isolated stannaneselone, Tbt(Ditp)Sn=Se 5a, revealed a completely trigonal geometry around the central tin with a remarkably short Sn-Se bond length, indicative of structural similarity to a ketone.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ja048453h
  DOI ID：10.1021/ja048453h, ISSN：0002-7863, Web of Science ID：WOS:000225349800063
• Synthesis of Stannole Anion by Alkylation of Stannole Dianion　　　　　　　　　　　　　　　
  SAITO Masaichi; HAGA Ryuta; YOSHIOKA Michikazu
  Chemistry Letters, Volume：32, Number：10, First page：912, Last page：913, Oct. 2003
  Reaction of tert-butylchloride with the stannole dianion first and simply prepared by the reduction of 1,1,2,3,4,5-hexaphenylstannole with lithium in ether gave 1-tert-butylstannole anion which was characterized by ¹H, ¹³C, ¹¹⁹Sn, and ⁷Li NMR spectra and whose reactivities were investigated.
  The Chemical Society of Japan, English
  DOI：https://doi.org/10.1246/cl.2003.912
  DOI ID：10.1246/cl.2003.912, ISSN：0366-7022, CiNii Articles ID：10012819966, CiNii Books ID：AA00603318
• The first kinetically stabilized stannaneselone and diselenastannirane: Synthesis by deselenation of a tetraselenastannolane and structures　　　　　　　　　　　　　　　
  M Saito; N Tokitoh; R Okazaki
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Volume：119, Number：45, First page：11124, Last page：11125, Nov. 1997, [Reviewed]
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ja972221j
  DOI ID：10.1021/ja972221j, ISSN：0002-7863, Web of Science ID：WOS:A1997YG27300045
• Stable stannaneselone and diselena-stannirane: Novel organotin compounds derived from an extremely hindered tetraselenastannolane　　　　　　　　　　　　　　　
  Renji Okazaki; Masaichi Saito; Norihiro Tokitoh
  Phosphorus, Sulfur and Silicon and Related Elements, Volume：124, First page：363, Last page：370, 1997
  The first kinetically stabilized stannaneselone, Tbt(Ditp)Sn=Se (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl
  Ditp = 2,2″-diisopropyl-m-terphenyl-2′-yl), with a tin-selenium double bond and a stable diselenastannirane, Tbt(Ditp)SnSe2 were synthesized by deselenation of the corresponding tetraselenastannolane, Tbt(Ditp)SnSe4 with 3 equiv. and 2 equiv. triphenylphosphine, respectively. The X-ray structural analysis of the stannaneselone revealed that it has a trigonal planar structure with the Sn-Se bond length of 2.375(3) Å, which is approximately 9% shorter than that of the corresponding single bond and the shortest among Sn-Se bond lengths so far reported. The molecular structure of diselenastannirane determined by X-ray analysis shows that it has an unusually long Se-Se bond (2.524 Å), about 0.2 Å longer than a typical Se-Se single bond.
  Taylor and Francis Ltd., English, Scientific journal
  DOI：https://doi.org/10.1080/10426509708046793
  DOI ID：10.1080/10426509708046793, ISSN：1042-6507, SCOPUS ID：0346443515
• Synthesis and reactions of a stannanethione derived from a kinetically stabilized diarylstannylene　　　　　　　　　　　　　　　
  M Saito; N Tokitoh; R Okazaki
  ORGANOMETALLICS, Volume：15, Number：21, First page：4531, Last page：4536, Oct. 1996, [Reviewed]
  Stannanethione Tbt(Tip)Sn=S (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl; Tip = 2,4,6-triisopropylphenyl), containing a novel tin-sulfur double bond, was synthesized by the reactions of the corresponding kinetically stabilized diarylstannylene Tbt(Tip)Sn: with styrene episulfide or elemental sulfur. An absorption maximum due to the n-pi* transition of the tin-sulfur double bond appeared at 473 nm in hexane. It reacted with thiocumulenes such as carbon disulfide and phenyl isothiocyanate and with styrene oxide and mesitonitrile oxide to give the corresponding cycloadducts. The structure of the [2 + 2] cycloadduct of a stannanethione with carbon disulfide was determined by X-ray structural analysis. In contrast to Tbt(Tip)Sn=S, the less hindered stannanethione Tbt(Mes)Sn=S (Mes = mesityl) dimerized at room temperature to afford the corresponding 1,3,2,4-dithiadistannetane.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/om960449u
  DOI ID：10.1021/om960449u, ISSN：0276-7333, Web of Science ID：WOS:A1996VM85200031
• Synthesis and reactions of stanneneselone　　　　　　　　　　　　　　　
  Masaichi Saito; Norihiro Tokitoh; Renji Okazaki
  Journal of Organometallic Chemistry, Volume：499, Number：1-2, First page：43, Last page：48, Sep. 1995, [Reviewed]
  Stannaneselone Tbt(TipSnSe (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl
  Tip = 2,4,6-triisopropylphenyl), a novel compound containing a tin-selenium double bond was synthesized by the reaction of the corresponding stannylene Tbt(Tip)Sn with elemental selenium. It reacted with phenyl isothiocyanate, mesitonitrile oxide and styrene oxide to afford cycloadducts. In the reaction with phenyl isothiocyanate, 1,3,2-dithia- and diselenastannetanes were obtained instead of the expected 1,3,2-thiaselenastannetane. Another approach to the stannaneselone by deselenation of the corresponding 1,2,3,4,5-tetraselenastannolane with triphenylphosphine is also described. © 1995.
  English, Scientific journal
  DOI：https://doi.org/10.1016/0022-328X(95)00334-M
  DOI ID：10.1016/0022-328X(95)00334-M, ISSN：0022-328X, SCOPUS ID：0001797294
• REACTION OF A STANNYLENE WITH CARBON-DISULFIDE - FORMATION OF A NOVEL TIN-CONTAINING 1,3-DIPOLE AND ITS REACTIVITY　　　　　　　　　　　　　　　
  M SAITO; N TOKITOH; R OKAZAKI
  ORGANOMETALLICS, Volume：14, Number：8, First page：3620, Last page：3622, Aug. 1995, [Reviewed]
  The reaction of the stannylene Tbt(Tip)Sn: (1; Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Tip = 2,4,6-triisopropylphenyl), synthesized by reduction of Tbt(Tip)SnBr2 with lithium naphthalenide, with carbon disulfide in the presence of electron-deficient olefins, such as methyl acrylate, acrylonitrile, and methyl methacrylate, gave cycloadducts of the intermediary 1,3-dipole Tbt(TipSn--S-C+=S (4). In the absence of the olefins, there was formed the unsymmetrical olefin Tbt(Tip)-SnS2C=CS2C(=S)SSnTbt(Tip) (8), the structure for which was established by X-ray crystallography. Upon thermolysis, the olefin 8 underwent CS2 extrusion to afford the symmetrical olefin Tbt(Tip)SnS2C=CS(2)SnTbt-(Tip) (9). The intermediary 1,3-dipole 4 showed lambda(max) at 608 nm and was stable up to ca. -30 degrees C.
  AMER CHEMICAL SOC, English
  DOI：https://doi.org/10.1021/om00008a005
  DOI ID：10.1021/om00008a005, ISSN：0276-7333, Web of Science ID：WOS:A1995RQ47100005
• New aspects in the chemistry of low-coordinate compounds of group 14 elements　　　　　　　　　　　　　　　
  Norihiro Tokitoh; Yasusuke Matsuhashi; Kazusato Shibata; Tsuyoshi Matsumoto; Hiroyuki Suzuki; Masaichi Saito; Kyoko Manmaru; Renji Okazaki
  Main Group Metal Chemistry, Volume：17, Number：1-4, First page：55, Last page：66, 1994, [Reviewed]
  : Introduction of a new steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (denoted as Tb in this article) onto heavier group 14 elements together with other bulky aryl groups such as mesityl (Mes) or 2,4,6-triisopropylphenyl (Tip) enabled us to synthesize unprecedented, stable diaryl substituted tetrachalcogenametallolanes, Tb(Ar)MY4 (M = Si, Ge, and Sn
  Y = S and Se), as well as the heavier group 14 element carbene analogues, Tb(Ar)M: (M = Ge and Sn), stable in solution. Furthermore, the first examples of kinetically stabilized metallathiones and metallaselones of group 14 metals Tb(Ar)M=Y were obtained by taking advantage of the following two different approaches, i) the reactions of the overcrowded divalent metal species with some epichal-cogenides or elemental chalcogen, and ii) the dechalcogenation of the 1,2,3,4,5-tetrachalcogenametallolanes with phosphine reagents. Of these Tb(Ar)M=Y germanethione Tb(Tip)Ge=S was isolated as orange crystals, the molecular geometry of which was established by X-ray structural analysis. © 1994, Walter de Gruyter. All rights reserved.
  English, Scientific journal
  DOI：https://doi.org/10.1515/MGMC.1994.17.1-4.55
  DOI ID：10.1515/MGMC.1994.17.1-4.55, ISSN：2191-0219, SCOPUS ID：21344491344
• THE 1ST STABLE STANNANETHIONE IN SOLUTION DERIVED FROM A KINETICALLY STABILIZED DIARYLSTANNYLENE　　　　　　　　　　　　　　　
  N TOKITOH; M SAITO; R OKAZAKI
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Volume：115, Number：5, First page：2065, Last page：2066, Mar. 1993, [Reviewed]
  AMER CHEMICAL SOC, English
  DOI：https://doi.org/10.1021/ja00058a078
  DOI ID：10.1021/ja00058a078, ISSN：0002-7863, Web of Science ID：WOS:A1993KR82500078
• Synthesis of small-ring sulfur compounds containing germanium and tin　　　　　　　　　　　　　　　
  Renji Okazaki; Yasusuke Matsuhashi; Tsuyoshi Matsumoto; Masaichi Saito; Kyoko Manmaru; Norihiro Tokitoh
  Phosphorus, Sulfur, and Silicon and the Related Elements, Volume：74, Number：1-4, First page：397, Last page：398, Jan. 1993, [Reviewed]
  Synthesis of some novel types of four-membered organosulfur compounds containing germanium and tin by [2+2]cycloaddition of germanethione (R1R2Ge=S) and stannanethione (R1R2Sn = S) intermediates is reported. © 1993, Taylor &
  Francis Group, LLC. All rights reserved.
  English, Scientific journal
  DOI：https://doi.org/10.1080/10426509308038133
  DOI ID：10.1080/10426509308038133, ISSN：1563-5325, SCOPUS ID：84959954104

• ジベンゾペンタレンの新しい反応　　　　　　　　　　　　　　　
  斎藤雅一; 桑原拓也; 橋本陽子; 田嶋智之; 石村和也; 永瀬茂; 箕浦真生
  Volume：39th, 2012
  J-Global ID：201302268628019972
• ベンゼンの骨格炭素を鉛に換えてもベンゼンの性質は保持されるのか?(レーダー)　　　　　　　　　　　　　　　
  斎藤 雅一
  Volume：59, Number：9, First page：456, Last page：457, 20 Sep. 2011
  Japanese
  DOI：https://doi.org/10.20665/kakyoshi.59.9_456
  DOI ID：10.20665/kakyoshi.59.9_456, ISSN：0386-2151, CiNii Articles ID：110008898474, CiNii Books ID：AN10033386
• Novel reactions of steric encumbered 1,4-dilithio-1,3-butadiene with group 14 electrophiles: formation and structure of stable dihydroxygermole　　　　　　　　　　　　　　　
  Saito Masaichi; Nakamura Michio; Tajima Tomoyuki
  Heterocycles, Volume：78, Number：3, First page：657, Last page：668, 01 Mar. 2009
  English
  ISSN：0385-5414, CiNii Articles ID：40016463157, CiNii Books ID：AA00663739
• Dechalcogenation of pentachalcogenadistanna-bicyclo〔3.1.1〕heptanes　　　　　　　　　　　　　　　
  Saito Masaichi; Hashimoto Hizuru; Tajima Tomoyuki
  Heterocycles, Volume：76, Number：1, First page：515, Last page：520, 03 Sep. 2008
  English
  ISSN：0385-5414, CiNii Articles ID：40016208589, CiNii Books ID：AA00663739
• トリリチオゲルマン,およびトリリチオスタンナンの合成　　　　　　　　　　　　　　　
  田嶋智之; 池田正俊; 斎藤雅一
  Volume：87th, Number：1, 2007
  ISSN：0285-7626, J-Global ID：200902279390605443
• スズを骨格に有する特異なπ電子系の創製 : 芳香族系拡張への挑戦　　　　　　　　　　　　　　　
  斎藤 雅一
  Volume：59, Number：2, First page：140, Last page：143, 01 Feb. 2006
  Japanese
  ISSN：0022-7684, CiNii Articles ID：10017245949, CiNii Books ID：AN00037562
• Synthesis, structures, and reactions of anions and dianions of group 14 metalloles　　　　　　　　　　　　　　　
  M Saito; M Yoshioka
  JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN, Volume：62, Number：8, First page：790, Last page：798, Aug. 2004
  The synthesis, structures and physical and chemical properties of mono- and dianions of group 14 metalloles (1-metallacyclopentadiene), heavier congeners of the cyclopentadienyl anion, are described. The silole anion shows aromaticity with different extent by its substituent, while the germole anion does not show aromaticity. On the contrary, dianions of metalloles have a great extent of aromatic character owing to strong participation of divalent resonance forms. Theorefical calculation suggests that the coordination of lithium to the metallole 5 dianions should promote their aromaticity. The synthesis and characterization of eta(5)-silolyl and eta(5)-germolyl metal complexes, analogs of ferrocene, are also described.
  SOC SYNTHETIC ORGANIC CHEM JPN, Japanese
  DOI：https://doi.org/10.5059/yukigoseikyokaishi.62.790
  DOI ID：10.5059/yukigoseikyokaishi.62.790, ISSN：0037-9980, CiNii Articles ID：130000928732, Web of Science ID：WOS:000223438500004
• Chemistry of benzocyclobutenols　　　　　　　　　　　　　　　
  M. Yoshioka; M. Saito
  Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry, Volume：59, Number：7, First page：689, Last page：696, 2001
  Photochemical cyclization of substituted o-alkylphenyl ketones and the thermal and acid-catalyzed reactions of the resulting benzocyclobutenols are described. The selective thermal ring opening of the benzocyclobutenol to the E-dienol was elucidated using the deuterated benzocyclobutenol and by thermal interconversion between two diastereomeric benzocyclobutenols. The 2, 2-dimethylbenzocyclobutenols having a hydroxy group on the β-carbon of the quaternary C1-alkyl group underwent stereospecific thermal isomerization by a 1, 5-sigmatropic hydrogen shift to give the 2-isopropenylphenyl alcohol through a twisted E-dienol. The benzocyclobutenols having a keto group on the β-carbon of the quaternary C1-alkyl group underwent thermal retro-aldol cleavage to give benzocyclobutenones. Acid-catalyzed reaction of benzocyclobutenols having α, α-dimethyl and β-hydroxy or β-acetoxy groups in their C1-alkyl chain gave isopropylidenebenzocyclobutene.
  Society of Synthetic Organic Chemistry, Japanese
  DOI：https://doi.org/10.5059/yukigoseikyokaishi.59.689
  DOI ID：10.5059/yukigoseikyokaishi.59.689, ISSN：0037-9980, CiNii Articles ID：10012288117, SCOPUS ID：0034818756
• A New Method for the Synthesis of Stannylenes : Exhaustive Desulfurization of Tetrathiastannolanes　　　　　　　　　　　　　　　
  SAITO Masaichi; TOKITOH Norihiro; OKAZAKI Renji
  Volume：1996, Number：4, First page：265, Last page：266, 05 Apr. 1996
  English
  ISSN：0366-7022, CiNii Articles ID：10003739422, CiNii Books ID：AA00603318

• Creation of the chemistry of sigma-delocalized radicals　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2024 - 31 Mar. 2027
  Saitama University
  Grant amount(Total)：18590000, Direct funding：14300000, Indirect funding：4290000
  Grant number：24K01464
• Creation of a New Mechanism for Electron Delocalization by Taking Advantage of Non-bonded Interactions between Heavy Atoms　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory), 30 Jun. 2022 - 31 Mar. 2025
  Saitama University
  Grant amount(Total)：6500000, Direct funding：5000000, Indirect funding：1500000
  Grant number：22K19019
• Creation and Development of (sigma + pi) Double Aromatic and Double Delocalized Systems　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), 01 Apr. 2018 - 31 Mar. 2021
  Saito Masaichi, Saitama University
  Grant amount(Total)：44980000, Direct funding：34600000, Indirect funding：10380000
  The authors have already reported on an originally designed (sigma+pi)-double aromatic compound that has a sigma-aromatic moiety on the periphery of a benzene platform. In this study, to generalize the concept of (sigma+pi)-double aromaticity, we have synthesized a variety of (sigma+pi)-double aromatic compounds that bear heavy atoms on the periphery of a central benzene ring. We have newly designed and synthesized compounds bearing (sigma+pi)-mixed conjugation systems, where a sigma-delocalized system can interact with a coplanar pi-delocalized system. We have found that non-bonded interactions between heavy chalcogen atoms on the periphery of a benzene ring can regulate properties of the compounds.
  Grant number：18H03908
• pi-HUB: An international research network for promoting the "pi-Figuration" project　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), 06 Nov. 2015 - 31 Mar. 2020
  Fukushima Takanori, Tokyo Institute of Technology
  Grant amount(Total)：57330000, Direct funding：44100000, Indirect funding：13230000
  This research project focused on the construction of international joint research network, "π-Hub", as a part of the Grant-in-Aid for Scientific Research on Innovative Areas "π-Figuration". To promote active international research exchanges, we supported the invitations of overseas researchers as well as the short-term stays of domestic researchers in overseas research groups. We also organized and supported international symposiums, which were held in overseas research organizations. Through these efforts, joint researches with a total of 40 overseas research institutes with researchers from 17 countries were carried out, and thus, we have formed a tight and strong π-Hub network.
  Grant number：15K21721
• Creation of Main Group Compounds Behaving Like Transition-metal Compounds and Their Reactivity　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory), 30 Jun. 2017 - 31 Mar. 2019
  Saito Masaichi; Furukawa Shunsuke, Saitama University
  Grant amount(Total)：6500000, Direct funding：5000000, Indirect funding：1500000
  We have focused on the reactivity of a zero-valent main group compounds stabilized by a butadiene as a 4pi electron donor that we have already synthesized and is still the only one example of a zero-valent main group compounds stabilized by a butadiene ligand. We have found a unique ligand exchange reaction in the zero-valent tin compound, which is normally observed in the zero-valent transition-metal compounds. The stability of the zero-valent tin compounds is highly dependent on substituents on the carbon atoms. We have also succeeded in the synthesis of the first example of a zero-valent lead compound stabilized by a butadiene ligand.
  Grant number：17K19113
• Main Group pi-Figuration　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), 10 Jul. 2014 - 31 Mar. 2019
  Saito Masaichi; Furukawa Shunsuke, Saitama University
  Grant amount(Total)：38090000, Direct funding：29300000, Indirect funding：8790000
  We have accomplished the creation of pi-systems that cannot be accessed by the use of only carbon atoms but can be synthesized by taking advantage of heavy main group atoms, which adopt a wide variety of structures and exhibit a wide variety of reactivities. We have succeeded in the creation of a out-of-plane anisotropic pi-conjugated compound by the introduction of phosphorus functionalities. We have demonstrated a bowl-to-bowl inversion of a pi-conjugated compound bearing long C-main group atom bonds as a new strategy for the creation of organoferroelectric compounds. We have succeeded in the synthesis of a coordination polymer by the use of a vacant orbital of a divalent tin compound and a wide variety of transition-metal complexes that bear unique electronic structures derived from an aromatic dianionic tin compound.
  Grant number：26102006
• Creation of Transition-metal Complexes with Anionic Aromatic Ligands Bearing Heavy Atoms in the Skeletons　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2015 - 31 Mar. 2018
  Saito Masaichi; TANAKA Ken; NAGASE Shigeru, Saitama University
  Grant amount(Total)：17030000, Direct funding：13100000, Indirect funding：3930000
  The reactions of dilithio-stannoles and a -plumbole, which are dianionic aromatic compounds, with transition-metal reagents afforded transition-metal complexes bearing stannole and plumbole ligands. The structures of thus obtained complexes were determined by X-ray diffraction analysis and their unique electronic characteristics and properties were evaluated. The reaction using the plumbole complex as a catalyst was found.
  Grant number：15H03774
• Activation of Dinitrogen Molecule by Main Group Compounds　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, 01 Apr. 2015 - 31 Mar. 2017
  SAITO Masaichi; NAGASE Shigeru; OKANO Ippei; TODA Mizuki, Saitama University
  Grant amount(Total)：3900000, Direct funding：3000000, Indirect funding：900000
  To activate dinitrogen molecule by main group compounds, an unprecedented main group element-dinitrogen complex should be necessary. In this work, we targeted a lithiostannylene and a silacyclopentadienylidene that were predicted to form stable complexes with dinitrogen molecules. Reduction of Cp*SnCl with lithium did not afford the targeted Cp*SnLi, which was thought to be thermally unstable. We nest chose 3,5-dimesitylphenyl group as a steric protection group succeeded in the synthesis of a dichlorosilole, which is stable under air. The generation of a silacyclopentadienylidene was achieved by the reduction of thus-obtained dichlorosilole with potassium graphite.
  Grant number：15K13636
• 含高周期元素反芳香族化合物の創製と新反応の開拓への展開　　　　　　　　　　　　　　　
  01 Apr. 2013 - 31 Mar. 2015
  Grant amount(Total)：7800000, Direct funding：6000000, Indirect funding：1800000
  Grant number：25109510
• Synthesis of Bowl-shaped Molecules with Silole Units and Investigation on their Innovative Properties　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, 01 Apr. 2013 - 31 Mar. 2015
  SAITO Masaichi, Saitama University
  Grant amount(Total)：4160000, Direct funding：3200000, Indirect funding：960000
  We designed hexasila[6]circulene, which is composed of six annulated siloles of importance in the field of materials science, and hexathia[6]circulene, which has a bowl-shaped structure with six annulated thiophenes. According to theoretical calculations, they are predicted to have low-lying LUMOs and small HOMO-LUMO gaps, compared to those of trisilasumanenes that we have already reported, being envisioned to be useful building blocks for important functional molecules. We tried to prepare the designed molecules and succeeded in the synthesis of their promising precursors.
  Grant number：25620023
• Investigation on σ-Aromatic and σ-Antiaromatic Compounds　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, 2011 - 2012
  SAITO Masaichi, Saitama University
  Grant amount(Total)：3900000, Direct funding：3000000, Indirect funding：900000
  Reduction of aluminum trichloride-N-heterocyclic carbene adduct with lithium naphthalenide afforded dichloroaluminum radical, the formation of which was evidenced by a trapping experiment. Reduction of N-heterocyclic carbene adduct of dichloroalumane bearing a bulky silyl substituent provided an unexpected compound through migration of an aluminum moiety and elimination of a substituent on the nitrogen atom. Debrominative reactions of1,2-bis(phenylseleno)benzene dibromide with tribromoborane and Ag reagents gave bromoselenonium cation and unexpected selenanthrenium cations, respectively.
  Grant number：23655029
• Synthesis of Triple-bonded Compounds Derived from Trianion Species of Heavier Group 14 Elements and their Application to Polymers　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 2010 - 2012
  SAITO Masaichi; NAGASE Shigeru, Saitama University
  Grant amount(Total)：19760000, Direct funding：15200000, Indirect funding：4560000
  Transmetalation reactions of tritellurosilane, trisilylsilane and trisilylgermane afforded the corresponding monolithio species. Reinvestigation on the transmetalation reaction of trisilylstannane provided lithiostannane, which surprisingly reacted as a trianion equivalent. Germyldichlorophosphine derived from lithiogermane reacted with potassium t-butoxide to afford phosphagermavinylidene dimer, suggesting that formation of an intermediary germanium-phosphorus triple-bonded compound.
  Grant number：22350015
• 新しい芳香族性の概念であるσ芳香族化学の創成　　　　　　　　　　　　　　　
  2009 - 2010
  Grant amount(Total)：3200000, Direct funding：3200000
  Grant number：21655012
• トリアニオン化学の創成と高周期異核三重結合化合物への展開　　　　　　　　　　　　　　　
  2008 - 2009
  Grant amount(Total)：3000000, Direct funding：3000000
  Grant number：20038010
• 含スズ芳香族系の創製とその機能化　　　　　　　　　　　　　　　
  2005 - 2006
  Grant amount(Total)：3600000, Direct funding：3600000
  Grant number：17750032
• スズを含む特異なπ電子系の合成とその反応、構造及び物性　　　　　　　　　　　　　　　
  2001 - 2002
  Grant amount(Total)：2200000, Direct funding：2200000
  Grant number：13740349
• 高周期14族-16族元素二重結合化合物の新規な発生法の開発とその光化学　　　　　　　　　　　　　　　
  1998 - 1999
  Grant amount(Total)：2100000, Direct funding：2100000
  Grant number：10740288