Performance information

• Synthesis and characterization of a diarylstannylene bearing (MeO)EPind groups and its oxidation reactions
  Yuto Ueno; Mizuki Imai; Yuki Maehara; Kotomi Matsui; Yuria Kawase; Kei Ota; Daisuke Hashizume; Tsukasa Matsuo
  Bulletin of the Chemical Society of Japan, Volume：98, Number：11, Oct. 2025, [Reviewed]
  Abstract
  
  A new diarylstannylene, [(MeO)EPind]2Sn: (1), has been synthesized and isolated using a novel protecting group, (MeO)EPind, which incorporates an electron-donating methoxy chain at the para position of the EPind group. The structure and electronic properties of 1 were investigated using crystallographic and spectroscopic methods as well as DFT calculations. The reaction of 1 with N2O gas produced a diarylstannanone, [(MeO)EPind]2Sn=O (2), which subsequently reacted with H2O to afford a stannanediol, [(MeO)EPind]2Sn(OH)2 (3). We also examined the reaction of 1 with elemental sulfur (S8), which resulted in the formation of a mixture containing diarylstannanethione, [(MeO)EPind]2Sn=S (4) and 1,2,3,4,5-tetrathiastannolane, [(MeO)EPind]2SnS4 (5). The structural features and bonding nature of these Sn(IV) compounds have been both experimentally and theoretically characterized.
  Oxford University Press (OUP), Scientific journal
  DOI：https://doi.org/10.1093/bulcsj/uoaf104
  DOI ID：10.1093/bulcsj/uoaf104, ISSN：0009-2673, eISSN：1348-0634
• Organoantimony(I) Compounds Incorporating the Bulky Rind Groups: Selective Synthesis and Characterization of Distibene and Cyclotetrastibane
  Yuria Kawase; Kei Ota; Shotaro Ikoma; Kiyoto Sugahara; Tsukasa Nakahodo; Yoshiyuki Mizuhata; Tsukasa Matsuo
  Organometallics, Volume：44, Number：19, First page：2240, Last page：2249, Sep. 2025, [Reviewed]
  American Chemical Society (ACS), Scientific journal
  DOI：https://doi.org/10.1021/acs.organomet.5c00264
  DOI ID：10.1021/acs.organomet.5c00264, ISSN：0276-7333, eISSN：1520-6041
• Flash Communication: Exocyclic Alkenyl Tuning of Cyclic (Amino)carbene: Enhancing π-Acceptor Property without Ring Unsaturation
  Masaru Tanaka; Shota Kamiyama; Kei Ota; Norio Nakata
  Organometallics, Volume：44, Number：14, First page：1510, Last page：1514, Jul. 2025, [Reviewed]
  American Chemical Society (ACS), Scientific journal
  DOI：https://doi.org/10.1021/acs.organomet.5c00200
  DOI ID：10.1021/acs.organomet.5c00200, ISSN：0276-7333, eISSN：1520-6041
• A Monomeric Diarylstannanone with a Sn=O Double Bond: Synthesis and Characterization　　　　　　　　　　　　　　　
  Tomoharu Tanikawa; Yuto Ueno; Shigeaki Konaka; Yasuyuki Numata; Mizuki Imai; Kei Ota; Hiroyuki Fueno; Kazuyoshi Tanaka; Daisuke Hashizume; Tsukasa Matsuo
  Chemistry – An Asian Journal, May 2025, [Reviewed]
  Scientific journal
  DOI：https://doi.org/10.1002/asia.202401847
  DOI ID：10.1002/asia.202401847, ORCID：179740010
• Reactions of Halogermylenes with N‐Heterocyclic Carbenes: Selective Formation of Low Valent Ge(II) Species　　　　　　　　　　　　　　　
  Kei Ota; Shotaro Ikoma; Tomohisa Okuda; Taisei Itakura; Tsukasa Nakahodo; Daisuke Hashizume; Tsukasa Matsuo
  European Journal of Organic Chemistry, Apr. 2025, [Reviewed], [Lead, Corresponding]
  The reactions of the Rind‐based 1,2‐dihalodigermenes, (Eind)BrGe=GeBr(Eind) (1a), and (EMind)ClGe=GeCl(EMind) (1b), with two types of N‐heterocyclic carbenes (NHCs) (Im‐ⁱPr₂Me₂ and Im‐Me₄) result in the formation of the halogermylene mono‐NHC adducts, (Im‐ⁱPr₂Me₂)(Eind)GeBr (2a') and (Im‐ⁱPr₂Me₂)(EMind)GeCl (2b'), and the germyliumylidene cation bis‐NHC adducts, [(Im‐Me₄)₂(Eind)Ge]⁺[Br⁻] (3a) and [(Im‐Me₄)₂(EMind)Ge]⁺[Cl⁻] (3b). The resulting Ge(II) species are stabilized by the bulky Rind groups and the strongly σ‐donating NHC ligands, whose structures are confirmed by a single‐crystal X‐ray diffraction (SC‐XRD) analysis. Based on density functional theory (DFT) and quantum theory of atoms in molecules (QTAIM) calculations of 2a’ and the cationic part of 3a, it is concluded that while the GeC(Eind) and GeC(NHC) bonds exhibit distinct differences in their degrees of polarization, all the GeC bonds display a partially polarized covalent character. Both reaction energy calculations and experimental studies suggested the potential liberation of an NHC ligand from the germyliumylidene cation bis‐NHC adducts, leading to the exchange of the NHC ligands. The formation mechanism of 3a from 1a and two NHC molecules via (Im‐Me₄)(Eind)GeBr (2a) is discussed based on DFT calculations.
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/ejoc.202500112
  DOI ID：10.1002/ejoc.202500112, ISSN：1434-193X, eISSN：1099-0690, ORCID：181809941
• Silicon Analogues of Cyclopropyl Radical Derived from a Highly Stable Cyclic Disilene Compound Featuring a Si–Br Bond
  Ryoma Ohno; Kei Ota; Nagisa Nishimura; Kanta Taniguchi; Shuma Kurokawa; Tomonari Wakabayashi; Miho Hatanaka; Alfredo Rosas-Sánchez; Daisuke Hashizume; Tsukasa Matsuo
  Journal of the American Chemical Society, Volume：146, Number：36, First page：24911, Last page：24924, Aug. 2024, [Reviewed], [Corresponding]
  American Chemical Society (ACS), Scientific journal
  DOI：https://doi.org/10.1021/jacs.4c06111
  DOI ID：10.1021/jacs.4c06111, ISSN：0002-7863, eISSN：1520-5126
• Approach to the “Missing” Diarylsilylene: Formation, Characterization, and Intramolecular C–H Bond Activation of Blue Diarylsilylenes with Bulky Rind Groups
  Kazuki Mochihara; Tatsuto Morimoto; Kei Ota; Shinsuke Marumoto; Daisuke Hashizume; Tsukasa Matsuo
  International Journal of Molecular Sciences, Volume：25, Number：7, First page：3761, Last page：3761, Mar. 2024, [Reviewed]
  The treatment of the bulky Rind-based dibromosilanes, (Rind)2SiBr2 (2) [Rind = 1,1,7,7-tetra-R1-3,3,5,5-tetra-R2-s-hydrindacen-4-yl: EMind (a: R1 = Et, R2 = Me) and Eind (b: R1 = R2 = Et)], with two equivalents of tBuLi in Et2O at low temperatures resulted in the formation of blue solutions derived from the diarylsilylenes, (Rind)2Si: (3). Upon warming the solutions above −20 °C, the blue color gradually faded, accompanying the decomposition of 3 and yielding cyclic hydrosilanes (4) via intramolecular C–H bond insertion at the Si(II) center. The molecular structures of the bulky Eind-based 3b and 4b were confirmed by X-ray crystallography. Thus, at −20 °C, blue crystals were formed (Crystal-A), which were identified as mixed crystals of 3b and 4b. Additionally, colorless crystals of 4b as a singular component were isolated (Crystal-B), whose structure was also determined by an X-ray diffraction analysis. Although the isolation of 3 was difficult due to their thermally labile nature, their structural characteristics and electronic properties were discussed based on the experimental findings complemented by computational results. We also examined the hydrolysis of 3b to afford the silanol, (Eind)2SiH(OH) (5b).
  MDPI AG, Scientific journal
  DOI：https://doi.org/10.3390/ijms25073761
  DOI ID：10.3390/ijms25073761, eISSN：1422-0067, ORCID：156724167
• Selective monooxygenation of diphosphenes with molecular oxygen
  Yuria Kawase; Shota Tsujimoto; Tomohiro Obayashi; Satoshi Kimura; Kanta Ito; Shotaro Ikoma; Kei Ota; Daisuke Hashizume; Tsukasa Matsuo
  Dalton Transactions, Volume：53, Number：5, First page：1956, Last page：1960, 2024, [Reviewed]
  The O₂ splitting mediated by the bulky Rind-based diphosphenes leads to the clean formation of the diphosphene oxides with (O)PP moieties.
  Royal Society of Chemistry (RSC), Scientific journal
  DOI：https://doi.org/10.1039/d3dt04348g
  DOI ID：10.1039/d3dt04348g, ISSN：1477-9226, eISSN：1477-9234, ORCID：151003817
• A Series of Lithium Complexes of Bulky Rind-based Arylthiolate Ligands: Synthesis, Characterization, and Crystal Structures
  Masahiro Hamura; Kohei Sugano; Ryo Matsukura; Kei Ota; Tsukasa Nakahodo; Daisuke Hashizume; Tsukasa Matsuo
  Chemistry Letters, Volume：52, Number：3, First page：140, Last page：143, Mar. 2023, [Reviewed]
  The bulky Rind-based thiols, (Rind)SH (1) [Rind = 1,1,7,7-tetra-R1-3,3,5,5-tetra-R2-s-hydrindacen-4-yl: EMind (a: R1 = Et, R2 = Me), Eind (b: R1 = R2 = Et), and MPhind (c: R1 = Me, R2 = Ph)], reacted with nBuLi in THF to afford a series of lithium arylthiolates, [(Rind)SLi]n(THF)m (2), whose structures were confirmed by an X-ray diffraction analysis. In the solid state, while the less bulky EMind-based lithium thiolate exhibited a linear dimer, [(EMind)SLi]2(THF)4 (2a), or trimer, [(EMind)SLi]3(THF)5 (2a′), the monomeric structures of (Eind)SLi(THF)3 (2b) and (MPhind)SLi(THF)2 (2c) were found for the bulky Eind- and the bulkier MPhind-based systems. The salt metathesis reaction between 2a and FeCl2(THF)1.5 in THF produced the anionic three-coordinate planar Fe(II) thiolate complex, [Li(THF)3][{(EMind)S}3Fe] (3a).
  The Chemical Society of Japan, Scientific journal
  DOI：https://doi.org/10.1246/cl.220532
  DOI ID：10.1246/cl.220532, ISSN：0366-7022, eISSN：1348-0715, ORCID：139996761
• A series of (E)-1,2-diaryldigermenes incorporating bulky Eind groups: structural characteristics and absorption properties
  Shogo Yagura; Naoki Hayakawa; Airi Kuroda; Kei Ota; Rhota Tanishita; Genya Urasaki; Tsukasa Nakahodo; Hidetaka Nakai; Manabu Hoshino; Daisuke Hashizume; Tsukasa Matsuo
  Dalton Transactions, Volume：51, Number：48, First page：18633, Last page：18641, Nov. 2022, [Reviewed]
  We present the synthesis, structural features and absorption properties of a series of (E)-1,2-diaryldigermenes supported by the fused-ring bulky Eind groups.
  Royal Society of Chemistry (RSC), Scientific journal
  DOI：https://doi.org/10.1039/d2dt03427a
  DOI ID：10.1039/d2dt03427a, ISSN：1477-9226, eISSN：1477-9234, ORCID：123829486
• Formation and Reactions of Ge=O Double-bonded Species Bearing EMind Groups　　　　　　　　　　　　　　　
  Airi Kuroda; Naoko Fujita; Tomomi Horita; Kei Ota; Alfredo Rosas-S{\'{a } }nchez; Manabu Hoshino; Daisuke Hashizume; Tsukasa Matsuo
  Chemistry Letters, Volume：51, Number：8, First page：828, Last page：831, Aug. 2022, [Reviewed]
  The Chemical Society of Japan, English, Scientific journal
  DOI：https://doi.org/10.1246/cl.220222
  DOI ID：10.1246/cl.220222, ISSN：0366-7022, ORCID：120876564
• Zero-valent species of group 13–15 elements　　　　　　　　　　　　　　　
  Kei Ota; Rei Kinjo
  Chem, Volume：8, Number：2, First page：340, Last page：350, Feb. 2022, [Reviewed], [Lead]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/j.chempr.2022.01.010
  DOI ID：10.1016/j.chempr.2022.01.010, ISSN：2451-9294, ORCID：111475828
• A Crystalline B₄N₂ Dewar Benzene as a Building Block for Conjugated B,N-Chains
  Kei Ota; Rei Kinjo
  Journal of the American Chemical Society, Volume：143, Number：29, First page：11152, Last page：11159, Jul. 2021, [Reviewed], [Lead]
  American Chemical Society (ACS), Scientific journal
  DOI：https://doi.org/10.1021/jacs.1c04860
  DOI ID：10.1021/jacs.1c04860, ISSN：0002-7863, eISSN：1520-5126, ORCID：97045281
• Open questions in boron species with globally 4n π systems
  Kei Ota; Rei Kinjo
  Communications Chemistry, Volume：4, Number：1, Jul. 2021, [Reviewed], [Lead]
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1038/s42004-021-00542-x
  DOI ID：10.1038/s42004-021-00542-x, eISSN：2399-3669, ORCID：96913538
• Heavier element-containing aromatics of [4n+2]-electron systems
  Kei Ota; Rei Kinjo
  Chemical Society Reviews, Volume：50, Number：18, First page：10594, Last page：10673, 2021, [Reviewed], [Lead]
  This review focuses on the heavier group 13–15 element-containing heterocycles of [4n+2]-electron systems featuring classical and advanced aromatics.
  Royal Society of Chemistry (RSC), Scientific journal
  DOI：https://doi.org/10.1039/d0cs01354d
  DOI ID：10.1039/d0cs01354d, ISSN：0306-0012, eISSN：1460-4744, ORCID：98235239
• Aromatic nature of neutral and dianionic 1,4-diaza-2,3,5,6-tetraborinine derivatives　　　　　　　　　　　　　　　
  Kei Ota; Rei Kinjo
  RSC Advances, Volume：11, Number：1, First page：592, Last page：598, 2021, [Reviewed], [Lead]
  Royal Society of Chemistry ({RSC}), Scientific journal
  DOI：https://doi.org/10.1039/D0RA09040A
  DOI ID：10.1039/D0RA09040A, ORCID：86185630
• Inorganic Benzene Valence Isomers　　　　　　　　　　　　　　　
  Kei Ota; Rei Kinjo
  Chemistry – An Asian Journal, Volume：15, Number：17, First page：2558, Last page：2574, Sep. 2020, [Reviewed], [Lead]
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/asia.202000535
  DOI ID：10.1002/asia.202000535, ORCID：78491316
• A Neutral and Aromatic Boron‐Rich Inorganic Benzene　　　　　　　　　　　　　　　
  Kei Ota; Rei Kinjo
  Angewandte Chemie International Edition, Volume：59, Number：16, First page：6572, Last page：6575, Apr. 2020, [Reviewed], [Lead]
  Wiley, English, Scientific journal
  DOI：https://doi.org/10.1002/anie.201915790
  DOI ID：10.1002/anie.201915790, ISSN：1433-7851, ORCID：96101383
• Germylone-bridged bimetallic Ir and Rh complexes　　　　　　　　　　　　　　　
  Bochao Su; Kei Ota; Yongxin Li; Rei Kinjo
  Dalton Transactions, Volume：48, Number：11, First page：3555, Last page：3559, 2019, [Reviewed]
  

  The reactions of germylone 1 with one equivalent of [M(COD)Cl]₂ (M = Ir, Rh) afforded the germylone-bridged bimetallic complexes 2 and 3, which have been spectroscopically and structurally characterized.

  
  Royal Society of Chemistry ({RSC}), English, Scientific journal
  DOI：https://doi.org/10.1039/c9dt00145j
  DOI ID：10.1039/c9dt00145j, ISSN：1477-9226, ORCID：96101384
• Zwitterionic Inorganic Benzene Valence Isomer with σ-Bonding between Two π-Orbitals　　　　　　　　　　　　　　　
  Bochao Su; Kei Ota; Kai Xu; Hajime Hirao; Rei Kinjo
  Journal of the American Chemical Society, Volume：140, Number：38, First page：11921, Last page：11925, Sep. 2018, [Reviewed]
  American Chemical Society ({ACS}), English, Scientific journal
  DOI：https://doi.org/10.1021/jacs.8b08025
  DOI ID：10.1021/jacs.8b08025, ISSN：0002-7863, ORCID：96101379
• Bis(stibahousene)　　　　　　　　　　　　　　　
  Vladimir Ya. Lee; Kei Ota; Yuki Ito; Olga A. Gapurenko; Akira Sekiguchi; Ruslan M. Minyaev; Vladimir I. Minkin; Heinz Gornitzka
  Journal of the American Chemical Society, Volume：139, Number：39, First page：13897, Last page：13902, Oct. 2017, [Reviewed]
  American Chemical Society ({ACS}), English, Scientific journal
  DOI：https://doi.org/10.1021/jacs.7b07712
  DOI ID：10.1021/jacs.7b07712, ISSN：0002-7863, ORCID：96101376

• Synthesis of Heavier Group 14 Element Cations　　　　　　　　　　　　　　　
  Kei Ota; Shotaro Ikoma; Tomohisa Okuda; Tsukasa Matsuo
  Sep. 2024
• Reaction of arylhalogermylenes with NHCs　　　　　　　　　　　　　　　
  Kei Ota; Shotaro Ikoma; Tsukasa Matsuo
  The 14th International Conference on Heteroatom Chemistry (ICHAC-14), Jul. 2024, [Invited]
• Synthesis and reduction of aryl cyclotrisilenylium ion　　　　　　　　　　　　　　　
  K. Ota; R. Ohno; N. Nishimura; T. Matsuo
  20th International Symposium on Silicon Chemistry (ISOS-20), May 2024
• アリール基を有する シクロトリシレニルカチオンの合成　　　　　　　　　　　　　　　
  太田圭; 大野稜真; 松尾司
  Dec. 2022
• Synthesis and Characterization of Boron-Rich Inorganic Benzene　　　　　　　　　　　　　　　
  太田圭; 金城玲
  Dec. 2020
• Synthesis, Characterization and Reactivities of Boron-Rich Dewar Benzene　　　　　　　　　　　　　　　
  Kei Ota; Rei Kinjo
  Dec. 2020
• Unexpected σ-bonding between two π-orbitals on the boron rich inorganic benzene valence isomer　　　　　　　　　　　　　　　
  Kei Ota
  PhD Student Workshop in Organic Chemistry, Nov. 2019
• Zwitterionic Inorganic Benzene Valence Isomer with sigma-Bonding between Two pai-Orbitals　　　　　　　　　　　　　　　
  Kei Ota; Bochao Su; Kai Xu; Hajime Hirao; Rei Kinjo
  Chemistry National Meeting Singapore (ChnmSG 2019), May 2019

• Apr. 2023 - Mar. 2024
  科学技術英語２
• Apr. 2023 - Mar. 2024
  アドバンスト有機化学
• Apr. 2022 - Mar. 2024
  基礎ゼミI・II
• Apr. 2022 - Mar. 2024
  応用化学実験IV
• Apr. 2022 - Mar. 2023
  応用化学実験II

• 2023 - Present
• 2016 - Present

• ホウ素０価単原子の創出とホウ素トランスファー反応への展開　　　　　　　　　　　　　　　
  01 Apr. 2024 - 31 Mar. 2026
  Grant amount(Total)：4680000, Direct funding：3600000, Indirect funding：1080000
  Grant number：24K17700
• 13族元素0価化学種の創出と元素トランスファー反応への展開　　　　　　　　　　　　　　　
  Aug. 2022 - Mar. 2024
  Grant amount(Total)：2860000, Direct funding：2200000, Indirect funding：660000
  Grant number：22K20561