Updated on 2026/09/05

写真a

 
YAMAMOTO KOJI
 
Organization
School of Materials and Chemical Technology Associate Professor
Title
Associate Professor
External link

News & Topics

Degree

  • 博士(理学) ( 大阪大学 )

Research History

  • Institute of Science Tokyo   School of Materials and Chemical Technology   Associate Professor

    2026.4

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    Country:Japan

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  • 防衛大学校   応用科学群応用化学科   講師

    2023.4 - 2026.3

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  • 防衛大学校   応用科学群応用化学科   助教

    2021.10 - 2023.3

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  • Tokyo Institute of Technology   School of Materials and Chemical Technology   Assistant Professor

    2017.1 - 2021.9

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  • Institute for Molecular Science   Research Center of Integrative Molecular Systems   Assistant Professor

    2013.4 - 2016.12

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  • The Graduate University for Advanced Studies   School of Physical Sciences

    2012.11 - 2016.12

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  • Institute for Molecular Science   Department of Life and Coordination-Complex Molecular Science   Assistant Professor

    2012.10 - 2013.3

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  • 日本学術振興会   特別研究員(DC1)

    2011.4 - 2012.9

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Professional Memberships

Papers

  • Syntheses and Structures of Dinuclear Copper Complexes with 1,4,7,10,13,16-Hexaazacyclooctadecane Ligands [Cu2(OCOR)2([18]ane-N6)][PF6]2 (R = CF3, tBu, Ph) for Electrochemical CO2 Reduction Reviewed

    Koji Yamamoto, Ryohei Kamiyama, Yasushi Umemura

    European Journal of Inorganic Chemistry   29 ( 6 )   e202500418   2026.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    The synthesis of dinuclear model complexes is important for developing new cooperative catalytic systems. Therefore, a series of dinuclear copper complexes, [Cu 2 (OCOR) 2 ([18]ane‐N 6 )][PF 6 ] 2 (R = CF 3 , t Bu, Ph), featuring two copper metal centers encapsulated within a 1,4,7,10,13,16‐hexaazacyclooctadecane ( 1 ) macrocycle, were synthesized by reacting ligand 1 with the corresponding Cu(II) salts, Cu(OCOR) 2 . The molecular structures of these complexes were elucidated through experimental and theoretical methods. In addition, their potential application in the electrochemical reduction of CO 2 was preliminarily investigated.

    DOI: 10.1002/ejic.202500418

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    Other Link: https://chemistry-europe.onlinelibrary.wiley.com/doi/full-xml/10.1002/ejic.202500418

  • A Family of Helical BN-Nanographenes: Systematic Synthesis, Structures, and Properties of Heterole-Fused Carbazole Azaborine Dimers Reviewed

    Koji Yamamoto, Nanako Kiuchi, Karen Hara, Koji Yamamoto, Yosuke Nakamura

    The Journal of Organic Chemistry   90 ( 41 )   14487 - 14499   2025.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.joc.5c01330

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  • Vacancy‐Induced Atomic Diffusion in a Molecular Metal Cluster Complex Reviewed

    Kosuke Iwata, Koshi Miyazawa, Kenta Kurashima, Hiroshige Yamaura, Bo Zhu, Yu Tian, Yuta Takahira, Koji Yamamoto, Tsubasa Omoda, Daisuke Hashizume, Shigeyoshi Sakaki, Tetsuro Murahashi

    Angewandte Chemie International Edition   64 ( 35 )   e202507444   2025.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    Abstract

    The presence of atomic vacancies in a close‐packed material is believed to allow the migration of atoms adjacent to the vacancies, which induces dynamics of atoms. However, it is not known whether atoms in discrete molecules can undergo vacancy‐induced dynamics. We describe herein the generation of a close‐packed Pd 12 cluster complex [Pd 12 (C 7 H 7 ) 6 ][B(Ar F ) 4 ] n ( n  = 2, 3) with a Pd‐atom vacancy, and the observation of the diffusion of Pd atoms. Variable‐temperature NMR analysis, X‐ray structure analysis, and theoretical calculations indicate that an atomic vacancy is located at the surface sites of the Pd 12 core, and that it migrates rapidly on the NMR timescale. This means that all 11 palladium atoms at the surface undergo self‐diffusion with a low energy barrier. These results demonstrate, for the first time, that atomic diffusion occurs within a molecule through the vacancy mechanism.

    DOI: 10.1002/anie.202507444

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  • Metal-Translocation-Coupled Ligand-Binding/Release by Dinuclear Rhodium Sandwich Complexes Reviewed

    Iori Inoue, Yukiho Aida, Koji Yamamoto, Tsubasa Omoda, Shigeyoshi Sakaki, Tetsuro Murahashi

    Chemistry – A European Journal   31 ( 19 )   e202404205   2025.2

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    Abstract

    Switching the location of metal atoms or ions in a molecule has been of great interest as a behavior of molecular machines. We describe herein that the reversible metal translocation can be coupled with the ligand‐binding/release of organometallic complexes. The two rhodium moieties sandwiched between arylpolyene ligands exhibit metal‐assembly and disassembly through reversible migration between the arene site and the olefin site, in response to the association and dissociation of additional ligands. This occurs either with bridging or even non‐bridging ligands, where the latter involves oxidative π‐addition of the unsaturated hydrocarbon binder to the metal moieties. The assembling‐ and disassembling states were characterized by NMR and X‐ray diffraction analysis.

    DOI: 10.1002/chem.202404205

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    Other Link: https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/chem.202404205

  • Furano- and Thieno-Fused Carbazole-Containing Azaborines and Their π-Extension: Synthesis, Structures, and Properties Reviewed

    Koji Yamamoto, Koji Yamamoto

    European Journal of Organic Chemistry   27 ( 46 )   e202400838   2024.10

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    Abstract

    A series of carbazole‐containing azaborines, furano‐fused 1–2F and 1–3F and thieno‐fused 1–2T and 1–3T, were efficiently synthesized from a common carbazole boronic acid ester in two steps. The structural effects of the fused ring moieties and the patterns of the ring fusion were clarified. According to X‐ray crystal structure analysis, the furano‐ and thieno‐fused carbazole azaborines had planar structures and generally formed 1D columns. UV–vis analysis revealed that their absorption properties were significantly affected by the fused ring moieties. In contrast, the fluorescence properties were affected by the ring fusion patterns. π‐Extended derivatives of 1–2T and 1–3T, benzothieno‐fused 1–2BT and 1–3BT and phenyl‐substituted 1–2T‐Ph2 and 1–3T‐Ph2 were synthesized, and the effects of π‐extension on physical properties were also investigated. All the π‐extended compounds showed red‐shifts in absorption and fluorescence spectra compared with the pristine 1–2T and 1–3T. The color of solid‐state emission of the synthesized azaborines was tuned from purple to green without electron‐rich or ‐deficient substituents. The structural effects on the electronic structures were also discussed based on theoretical calculations.

    DOI: 10.1002/ejoc.202400838

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  • Phenothiazine cyclic hexamers: synthesis, properties, and complexation behavior with C60 Reviewed

    Koji Yamamoto, Kanta Tsutsui, Miho Tanuma, Kaname Ito, Kan Wakamatsu, Koji Yamamoto, Yosuke Nakamura

    Chemical Communications   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    Phenothiazine cyclic hexamers linked at the 3,7-positions were synthesized. Effects of the cyclic structure as well as substituent effects of the nitrogen atom were disclosed. Furthermore, the cyclic hexamer encapsulated...

    DOI: 10.1039/d3cc06206f

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  • Spontaneous multilayer formation of an amphiphilic alkylammonium cation with a long hydrocarbon chain at an air-clay dispersion interface Reviewed

    Koji Yamamoto, Yoshihiro Miyauchi, Masanari Hirahara, Yasushi Umemura

    Thin Solid Films   780   139960 - 139960   2023.9

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.tsf.2023.139960

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  • Isolation and Structures of Polyarene Palladium Nanoclusters Reviewed

    Ayaka Hatano, Tsuyoshi Sugawa, Rei Mimura, Shunichi Kataoka, Koji Yamamoto, Tsubasa Omoda, Bo Zhu, Yu Tian, Shigeyoshi Sakaki, Tetsuro Murahashi

    Journal of the American Chemical Society   145 ( 28 )   15030 - 15035   2023.6

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/jacs.3c02849

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  • Phenothiazine-, Dihydroacridine-, and Acridone-Based Boron Difluoride Complexes: Synthesis and Structure–Property Relationships Reviewed

    Koji Yamamoto, Wakana Imai, Satoki Kanamori, Koji Yamamoto, Yosuke Nakamura

    The Journal of Organic Chemistry   88 ( 6 )   4003 - 4007   2023.2

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    DOI: 10.1021/acs.joc.3c00088

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  • Di- and trinuclear sandwich complexes of a cross-conjugated fulvene Reviewed

    Eiji Kudo, Yuki Oba, Koji Yamamoto, Tetsuro Murahashi

    Dalton Transactions   52 ( 6 )   1568 - 1573   2023

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    We report di- and trinuclear sandwich complexes of cross-π-conjugated fulvenes. The reversible extrusion of a Pd atom from inside to outside the sandwich framework occurs due to the cross-π-conjugation of fulvene.

    DOI: 10.1039/d2dt03521a

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  • Multinuclear coordination of fused benzene ring hydrocarbons Reviewed

    Koji Yamamoto, Tsuyoshi Sugawa, Tetsuro Murahashi

    Coordination Chemistry Reviews   466   214575 - 214575   2022.9

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.ccr.2022.214575

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  • Bridging coordination of acenaphthylene to a Pd3 chain or a Pd4 sheet cluster Reviewed

    Koji Yamamoto, Tsuyoshi Sugawa, Mio Kondo, Shigeyuki Masaoka, Tetsuro Murahashi

    Dalton Transactions   51 ( 5 )   1901 - 1906   2022

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry ({RSC})  

    DOI: 10.1039/D1DT04071E

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  • Selective E to Z isomerization of 1,3-Dienes Enabled by A Dinuclear Mechanism Reviewed

    Eiji Kudo, Kota Sasaki, Shiori Kawamata, Koji Yamamoto, Tetsuro Murahashi

    Nature Communications   12 ( 1 )   1473   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>The<italic>E</italic>/<italic>Z</italic>stereocontrol in a C=C bond is a fundamental issue in olefin synthesis. Although the thermodynamically more stable<italic>E</italic>geometry is readily addressable by thermal<italic>Z</italic>to<italic>E</italic>geometric isomerization through equilibrium, it has remained difficult to undergo thermal geometric isomerization to the reverse<italic>E</italic>to<italic>Z</italic>direction in a selective manner, because it requires kinetic trapping of<italic>Z</italic>-isomer with injection of chemical energy. Here we report that a dinuclear PdI−PdIcomplex mediates selective isomerization of<italic>E</italic>-1,3-diene to its<italic>Z</italic>-isomer without photoirradiation, where kinetic trapping is achieved through rational sequences of dinuclear elementary steps. The chemical energy required for the<italic>E</italic>to<italic>Z</italic>isomerization can be injected from an organic conjugate reaction through sharing of common Pd species.

    DOI: 10.1038/s41467-021-21720-4

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    Other Link: http://www.nature.com/articles/s41467-021-21720-4

  • Selective dimerization of a trinuclear mixed-metal sandwich complex: construction of an axially chiral metal skeleton Reviewed

    Hiroshige Yamaura, Koji Yamamoto, Tetsuro Murahashi

    Chemical Communications   57 ( 72 )   9120 - 9123   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    We report reductive dimerization of mixed metal Pd2Pt or PdPt2 sandwich complexes. The dimerization occurs through selective Pt–Pt bond formation, and the PdPt2 dimer has a unique axially chiral structure derived from the heterometal arrangement.

    DOI: 10.1039/d1cc03719f

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  • Heterometallic d8–d10 Coupling of Rh(I) and M(0) (M=Pd, Pt) in a Sandwich Framework of pπ‐Conjugated Ligands Reviewed

    Iori Inoue, Koji Yamamoto, Shigeyoshi Sakaki, Tetsuro Murahashi

    Chemistry – A European Journal   27 ( 41 )   10558 - 10562   2021.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/chem.202101133

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.202101133

  • Thiophene and Selenophene Binding at a Pd3 Cluster Site Reviewed

    Koji Yamamoto, Junya Sawada, Tetsuro Murahashi

    Chemistry – A European Journal   26 ( 38 )   8388 - 8392   2020.7

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/chem.202001796

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.202001796

  • Exceeding Metal Capacity in Sandwich Complexes: Ligand‐Unsupported Docking of Extra Metal Moieties at Edges of a Metal Sheet Sandwich Complex Reviewed

    Tomoko Ishikawa, Akino Kawamura, Tsuyoshi Sugawa, Risako Moridaira, Koji Yamamoto, Tetsuro Murahashi

    Angewandte Chemie International Edition   58 ( 43 )   15318 - 15323   2019.10

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    DOI: 10.1002/anie.201908850

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.201908850

  • Photo-induced translocation of a Pdn moiety (n = 2, 7) on a conjugated polyene ligand Reviewed

    Mitsuki Yamashita, Shinnosuke Horiuchi, Koji Yamamoto, Tetsuro Murahashi

    Dalton Transactions   48 ( 35 )   13149 - 13153   2019.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/C9DT03073E

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  • Extended Open‐Chain Polyenides as Versatile Delocalized Anion Ligands for Metal Chain Clusters Reviewed

    M. Yamashita, Y. Kawasumi, Y. Tachibana, S. Horiuchi, K. Yamamoto, T. Murahashi

    Chem. Eur. J   25 ( 5 )   1212 - 1216   2019.1

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    DOI: 10.1002/chem.201805800

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  • Three-Dimensional Sandwich Nanocubes Composed of 13-Atom Palladium Core and Hexakis-Carbocycle Shell Reviewed

    Teramoto, M, Iwata, K, Yamaura, H, Kurashima, K, Miyazawa, K, Kurashige, Y, Yamamoto, K, Murahashi, T

    Journal of the American Chemical Society   140 ( 40 )   12682 - 12686   2018.9

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  • Bimodal coordination of fused arenes to a Pd3 cluster site Reviewed

    Tsuyoshi Sugawa, Koji Yamamoto, Tetsuro Murahashi

    Chemical Communications   54 ( 46 )   5875 - 5878   2018

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    DOI: 10.1039/c8cc02880j

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  • Contiguous multiple π-coordination of π-conjugated polyenes: Bonding nature and charge delocalization behaviour of polyene-(palladium chain) sandwich clusters Reviewed

    Mariko Yamane, Mitsuki Yamashita, Koji Yamamoto, Tetsuro Murahashi

    Physical Chemistry Chemical Physics   20 ( 6 )   4287 - 4296   2018

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry  

    DOI: 10.1039/c7cp06735f

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  • Bridging Coordination of Vinylarenes to Pd-3- or Pd-4 Cluster Sites Reviewed

    Yuki Ishikawa, Seita Kimura, Koji Yamamoto, Tetsuro Murahashi

    CHEMISTRY-A EUROPEAN JOURNAL   23 ( 57 )   14149 - 14152   2017.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/chem.201703023

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  • Substrate Binding by a Parallel Metal Sheet Sandwich Complex: A Unique Role of an Additional Metal Atom Reviewed

    Yuki Ishikawa, Koji Yamamoto, Tetsuro Murahashi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   56 ( 5 )   1346 - 1350   2017.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/anie.201610784

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  • C(sp(3))-H Alkenylation Catalyzed by Cationic Alkylhafnium Complexes: Stereoselective Synthesis of Trisubstituted Alkenes from 2,6-Dimethylpyridines and Internal Alkynes Reviewed

    Michael J. Lopez, Ai Kondo, Haruki Nagae, Koji Yamamoto, Hayato Tsurugi, Kazushi Mashima

    ORGANOMETALLICS   35 ( 22 )   3816 - 3827   2016.11

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    DOI: 10.1021/acs.organomet.6b00655

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  • sigma- Continuum in Indole-Palladium(II) Complexes Reviewed

    Koji Yamamoto, Seita Kimura, Tetsuro Murahashi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   55 ( 17 )   5322 - 5326   2016.4

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    DOI: 10.1002/anie.201601992

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  • A mechanistic insight into metal-cluster pi-envelopment: a dual binding mode involving bent and planar ligand-conformers Reviewed

    Kohei Masai, Katsunori Shirato, Koji Yamamoto, Yuki Kurashige, Tetsuro Murahashi

    CHEMICAL COMMUNICATIONS   52 ( 38 )   6427 - 6430   2016

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    DOI: 10.1039/c6cc01536k

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  • Hydroalkylation of internal alkynes via C(sp3)-H bond activation of 2,6-dimethyl-N-heterocycles by cationic alkylhafnium complexes supported by dianionic multidentate ligands Reviewed

    Lopez M, Kondo A, Yamamoto K, Tsurugi H, Mashima K

    Abstracts of Papers of the American Chemical Society   251   2016

  • Dinuclear palladium(I) sandwich complexes of furan and toluene Reviewed

    Koji Yamamoto, Yuki Ishikawa, Seita Kimura, Kohei Takase, Tetsuro Murahashi

    COMPTES RENDUS CHIMIE   18 ( 7 )   785 - 789   2015.7

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.crci.2015.04.007

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  • Anti dinuclear adducts of cycloheptatriene and cycloheptatrienyl ligands: Anti-[Pd-2(mu-C7H8)(PPh3)(4)][BF4](2) and anti-[M-2(mu-C7H7)(PPh3)(4)] [BF4] (M = Pd, Pt) Reviewed

    Koji Yamamoto, Masahiro Teramoto, Kentaro Usui, Tetsuro Murahashi

    JOURNAL OF ORGANOMETALLIC CHEMISTRY   784   97 - 102   2015.5

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    DOI: 10.1016/j.jorganchem.2014.10.036

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  • Organomagnesium-Catalyzed Isomerization of Terminal Alkynes to Allenes and Internal Alkynes Reviewed

    Raphael Rochat, Koji Yamamoto, Michael J. Lopez, Haruki Nagae, Hayato Tsurugi, Kazushi Mashima

    CHEMISTRY-A EUROPEAN JOURNAL   21 ( 22 )   8112 - 8120   2015.5

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    DOI: 10.1002/chem.201500179

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  • Multinuclear metal-binding ability of a carotene Reviewed

    Shinnosuke Horiuchi, Yuki Tachibana, Mitsuki Yamashita, Koji Yamamoto, Kohei Masai, Kohei Takase, Teruo Matsutani, Shiori Kawamata, Yuki Kurashige, Takeshi Yanai, Tetsuro Murahashi

    NATURE COMMUNICATIONS   6   6742   2015.4

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    DOI: 10.1038/ncomms7742

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  • Modulation of Benzene or Naphthalene Binding to Palladium Cluster Sites by the Backside-Ligand Effect Reviewed

    Yuki Ishikawa, Seita Kimura, Kohei Takase, Koji Yamamoto, Yuki Kurashige, Takeshi Yanai, Tetsuro Murahashi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   54 ( 8 )   2482 - 2486   2015.2

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    DOI: 10.1002/anie.201409499

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  • Hydroalkylation of alkynes via C(sp3)-H bond activation of 2,6-lutidine by alkylhafnium complexes with tridentate nitrogen-based ligands Reviewed

    Lopez M, Kondo A, Yamamoto K, Tsurugi H, Mashima K

    Abstracts of Papers of the American Chemical Society   249   2015

  • Direct functionalization of unactivated C-H bonds catalyzed by group 3-5 metal alkyl complexes Reviewed

    Hayato Tsurugi, Koji Yamamoto, Haruki Nagae, Hiroshi Kaneko, Kazushi Mashima

    DALTON TRANSACTIONS   43 ( 6 )   2331 - 2343   2014

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    DOI: 10.1039/c3dt52758a

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  • Bis-cyclooctatetraene tripalladium sandwich complexes Reviewed

    Tetsuro Murahashi, Seita Kimura, Kohei Takase, Tomohito Uemura, Sensuke Ogoshi, Koji Yamamoto

    CHEMICAL COMMUNICATIONS   50 ( 7 )   820 - 822   2014

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    DOI: 10.1039/c3cc47515h

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  • C-H Metalation Reaction of Diarylamine and Carbazole by Alkylaluminum Complexes at the Heteroatom-Bridged Dimeric Aluminum Core Reviewed

    Koji Yamamoto, Yu Shibata, Yuki Kashiwa, Ai Kondo, Hayato Tsurugi, Kazushi Mashima

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   2013 ( 22-23 )   3821 - 3825   2013.8

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    DOI: 10.1002/ejic.201300210

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  • Bridging π-coordination of pyrrole and indole over a Pd I-PdI bond Reviewed

    Tetsuro Murahashi, Seita Kimura, Kohei Takase, Sensuke Ogoshi, Koji Yamamoto

    Chemical Communications   49 ( 39 )   4310 - 4312   2013.5

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    DOI: 10.1039/c2cc37554k

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  • Trinuclear palladium addition to unsaturated carbocycles Reviewed

    Tetsuro Murahashi, Kohei Takase, Kentaro Usui, Seita Kimura, Mayu Fujimoto, Tomohito Uemura, Sensuke Ogoshi, Koji Yamamoto

    DALTON TRANSACTIONS   42 ( 29 )   10626 - 10632   2013

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    DOI: 10.1039/c3dt51018b

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  • Preparation and Structure of Iminopyrrolyl and Amidopyrrolyl Complexes of Group 2 Metals Reviewed

    Tarun K. Panda, Keishi Yamamoto, Koji Yamamoto, Hiroshi Kaneko, Yi Yang, Hayato Tsurugi, Kazushi Mashima

    ORGANOMETALLICS   31 ( 6 )   2268 - 2274   2012.3

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    DOI: 10.1021/om201210y

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  • Diene Dissolution of the Heavier Alkaline Earth Metals Reviewed

    Olaf Michel, Hiroshi Kaneko, Hayato Tsurugi, Koji Yamamoto, Karl W. Tornroos, Reiner Anwander, Kazushi Mashima

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   ( 6 )   998 - 1003   2012.2

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    DOI: 10.1002/ejic.201101342

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  • Synthesis and Reaction of Neutral and Cationic Alkyltantalum Complexes with a Linked Cyclopentadienyl-Carboranyl Ligand Reviewed

    Hayato Tsurugi, Zaozao Qiu, Koji Yamamoto, Rocio Arteaga-Mueller, Kazushi Mashima, Zuowei Xie

    ORGANOMETALLICS   30 ( 21 )   5960 - 5964   2011.11

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    DOI: 10.1021/om200773m

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  • Reactivity of Permethylated Magnesium Complexes toward beta-Diimines Reviewed

    Olaf Michel, Koji Yamamoto, Hayato Tsurugi, Caecilia Maichle-Moessmer, Karl W. Toernroos, Kazushi Mashima, Reiner Anwander

    ORGANOMETALLICS   30 ( 14 )   3818 - 3825   2011.7

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    DOI: 10.1021/om200361m

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  • Coupling reaction of 2-alkylpyridine with alkynes catalyzed by alkylhafnium complexes Reviewed

    Hayato Tsurugi, Koji Yamamoto, Kazushi Mashima

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   241   2011.3

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  • Oxidant-Free Direct Coupling of Internal Alkynes and 2-Alkylpyridine via Double C-H Activations by Alkylhafnium Complexes Reviewed

    Hayato Tsurugi, Koji Yamamoto, Kazushi Mashima

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   133 ( 4 )   732 - 735   2011.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ja1100118

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Research Projects

  • 環状多座アミン配位子を用いた遷移金属クラスターの合成

    Grant number:22K05140  2022.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    山本 浩二

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

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  • サンドイッチ骨格に基づく非対称構造の構築

    Grant number:19H04565  2019.4 - 2021.3

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    山本 浩二

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    Authorship:Principal investigator 

    Grant amount:\4940000 ( Direct Cost: \3800000 、 Indirect Cost:\1140000 )

    メタロセン型錯体は有機金属化学における重要な化合物群であり、メタロセン骨格に基づく触媒や材料開発が精力的に行われている。これまで、メタロセン型単核錯体は前周期遷移金属のみに対して触媒設計に採用されてきた。一方、後周期遷移金属における単核サンドイッチ錯体群は18電子則の制約が足かせとなり、基質を金属中心上で受容する能力がないため、金属中心を反応場や分子認識場などの物性発現のプラットフォームとすることが困難であった。本研究では、配位子受容能を有するサンドイッチ錯体による非対称配位圏を構築する事を目的としている。本年度は5員環複素芳香環化合物を用いた二核サンドイッチ錯体の構造骨格に基づいたキラル構造の構築に取り組んだ。まず、パラジウム二核錯体に対して5員環複素芳香環化合物を架橋配位させることによって、チオフェンやセレノフェン二核サンドイッチ錯体およびセレノフェン五核サンドイッチ錯体の合成を行った。チオフェン二核サンドイッチ錯体およびセレノフェン五核サンドイッチ錯体についてはX線結晶構造解析によってその構造を明らかにした。

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  • Control of transition state based on addition and elimination of M-M bonds

    Grant number:17KT0102  2017.7 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Yamamoto Koji

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    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    Olefin isomerization is useful in controlling the E/Z configuration of olefinic substrates. In thermal reaction conditions, thermodynamically more stable E-olefins are usually formed. Herein, we developed the thermal E to Z isomerization of 1,3-diene using dicationic Pd(I)-Pd(I) dinuclear complexes.

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  • 三核サンドイッチクラスターを構造ユニットとする非対称配位圏の構築

    Grant number:17H05392  2017.4 - 2019.3

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    山本 浩二

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    Authorship:Principal investigator 

    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

    金属周りのキラル環境場の構築は、不斉分子認識や不斉触媒反応等キラル構造に基づく特異な性質を示すため、活発に研究がなされている。一方で、後周期遷移金属におけるサンドイッチ錯体群は18電子則の制約が足かせとなり、基質を金属中心上で受容する能力がないため、金属中心を不斉分子認識や不斉反応場などの物性発現のプラットフォームとする不斉反応にはほとんど用いられてこなかった。本研究では、後周期遷移金属三核サンドイッチクラスターの構造に着目し、これを用いて非対称配位圏の設計・構築法を確立することを目的とする。
    平成30年度は、これまで明らかにした白金-パラジウム異種混合金属サンドイッチ構造の一電子還元反応によって生成する6核錯体の単離および構造解明、反応性について取り組んだ。また、金属-金属結合形成による軸キラリティーの発現および物性探索に取り組むとともに、三核サンドイッチクラスターのトロピリウム配位子間をリンカーで連結した環状オリゴマーの合成を試みた。その結果、環状二量体錯体が形成することが明らかになった。この、リンカー部位に不斉中心を導入することにより、キラルな分子認識場が構築できると期待される。

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  • Sigma/Pi Coordination of Heteroarenes to a Transition Metal Center

    Grant number:16K17884  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    Yamamoto Koji

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    Authorship:Principal investigator 

    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    The coordination behavior of heteroarenes to a palladium center has attracted much attention since their coordination has been thought to be involved in Pd-catalyzed transformations of heteroarenes. While the eta1-sigma-coordinating heteroarenes complexes have been proposed in the Pd-catalyzed processes, the coordination behavior of heteroarenes has been still elusive. We demonstrated that there is a sigma-pi continuum for eta1-indole-Pd complexes through successful isolation, systematic structure analysis and theoretical calculation analysis of a series of non-anchored indole-Pd(II) complexes.

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  • Synthesis of Metal Sheet Sandwich Clusters

    Grant number:15H03789  2015.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Murahashi Tetsuro

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    Authorship:Coinvestigator(s) 

    Grant amount:\17160000 ( Direct Cost: \13200000 、 Indirect Cost:\3960000 )

    The sandwich structures is one of the most important molecular designs for transition metal compounds. In this project, we aimed at developing the structural concept of sandwich compounds containing metal sheet clusters. We found that an eight-membered carbocylce, cyclooctatetraene, has the ability to stabilize the metal sheet sandwich clusters with cyclopentadienyl- or vinylarene counter-ligands. Furthermore, we also elucidated the coordination behavior of hetero-arenes to transition metals.

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  • Organo-transition Metal Clusters: Synthesis and Elucidation of Dynamic Structures

    Grant number:25104010  2014.4 - 2016.3

    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)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Murahashi Tetsuro, Yamamoto Koji

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    Authorship:Coinvestigator(s) 

    Grant amount:\57070000 ( Direct Cost: \43900000 、 Indirect Cost:\13170000 )

    In this project, we focused on the contiguous π-coordination bonds which are formed at the molecular interface between the pπ-conjugated unsaturated hydrocarbons and the metal assemblies. We developed a synthetic method to construct the extended contiguous π-coordination bonds, that enabled construction of one-dimensional metal chain sandwich compounds having ten metal atoms. We also studied the two-dimensional contiguous multiple π-coordination bonds. Several aromatic ligands were successfully introduced on a trinuclear cluster face, and the ligand substitution mechanism was elucidated. Furthermore, we elucidated the bonding nature of the contiguous π-coordination bonds through experimental and theoretical analyses.

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  • シグマ結合メタセシス反応を利用した脱水素を伴う触媒的炭素-炭素結合形成反応の開発

    Grant number:11J01572  2011.4 - 2012.9

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    山本 浩二

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    Grant amount:\1300000 ( Direct Cost: \1300000 )

    本研究は、前周期遷移金属をはじめとして、2族、13族金属が示すシグマ結合メタセシス反応を利用することで、後周期遷移金属では達成されなかった反応開発を行うことを目的としている。研究従事者はこれまでに、4族遷移金属であるハフニウムを中心金属とする有機金属錯体を用いることによって、形式的に水素分子の脱離を伴う触媒的炭素一炭素結合形成反応を達成している。本反応はシグマ結合メタセシス反応による炭素一水素結合の活性化が鍵である。シグマ結合メタセシス反応を起こしうる2族や13族金属アルキル錯体を用いて炭素-水素結合の官能基化を展開することを目的として、その素反応研究を計画していた。当該年度において、研究従事者はマグネシウムアルキル錯体とアルミニウムアルキル錯体の合成を行い、これらの錯体を用いた炭素一水素結合活性化の検討を行った。
    研究の成果として、アミノ-イミン配位子とジアルキルマグネシウムとを反応させることで、イミン部位のアルキル化が進行した錯体の合成に成功した。また、この錯体を用いて、炭素-水素結合直接メタル化反応を検討したところ、C(sp3)-H結合のメタル化反応が進行することを明らかにした。また、トリアルキルアルミニウムに含窒素配位子を導入し、これを用いて炭素一水素結合の活性化の検討を行ったところ、C(sp2)-H結合の活性化が進行することを明らかにした。これらの素反応研究は触媒反応開発において重要な知見となることから意義ある研究である。さらなる素反応研究が求められる。

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