Tokyo Institute of Technology · Materials Science
Professor Kohtaro Osakada's research lab specializes in organometallic chemistry and catalysis, with a strong focus on transition-metal complexes for sustainable polymerization and carbon-carbon bond formation. The lab investigates nickel, palladium, gold, and ruthenium complexes that enable selective transformations such as ethylene copolymerization, carboxylation of haloarenes, and alkyne cross-coupling reactions. A key theme is the design of molecular structures—especially metal-metal interactions and ligand frameworks—that control reactivity and selectivity. The lab also explores the synthesis of complex organic architectures, such as cycloparaphenylenes, through tailored metal-ligand interactions.
Figures are computed from collected data and may differ slightly.
A dinuclear Ni complex with a double-decker structure (see scheme) and a short Ni–Ni distance promotes the copolymerization of ethylene with functional monomers. Matching of the Ni–Ni distance with the co-monomer structure resulted in polymers containing a high density of the co-monomer unit. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel-Complex-Promoted Carboxylation of Haloarenes Involving Insertion of CO2 into NiII-C BondsKohtaro Osakada, Rei Sato, and Takakazu YamamotoCite this: Organometallics 1994, 13, 11, 4645–4647Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/doi/10.1021/om00023a078https://doi.org/10.1021/om00023a078research-articleACS PublicationsRequest reuse permissionsArticl
The digold(I) complex [Au<sub>2</sub> Cl<sub>2</sub> (Cy<sub>2</sub> PCH<sub>2</sub> PCy<sub>2</sub> )] reacts with 4,4'-diphenylene diboronic acid to form a triangular macrocyclic complex with twisted Au-P-C-P-Au groups at the three corners. The synthesis of the complex and its chemical oxidation produced [6]cycloparaphenylene ([6]CPP) in 59 % overall yield.
trans-Pd(C6H4Me-p)(I)(PEt3)2 (2a) reacts with [Cu(C⋮CPh)(PPh3)]4 (Pd:Cu = 1:1) at room temperature to give the cross-coupling product PhC⋮CC6H4Me-p (3a) in 74% yield. Reactions of 2a with [Cu(C⋮CPh)(PPh3)]4 at −30 °C as well as of trans-Pd(C6H4X-p)(I)(PEt3)2 (2a, X = Me; 2b, X = OMe; 2c, X = F) with the alkynylcopper complex and additional PPh3 (2 mol/mol of Cu) at room temperature give mixtures of PhC⋮CC6H4X-p (3a, X = Me; 3b, X = OMe; 3c, X = F) and trans-Pd(C6H4X-p)(C⋮CPh)(PEt3)2 (4a, X = Me;
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structure, and formation mechanism of ruthenium aryloxide complexes cis-RuH(OAr)(PMe3)4 (Ar = C6H5, C6H4-p-Me) and cis-RuH(OC6H4-p-CN)(PMe3)4(HOC6H4-p-CN)Kohtaro Osakada, Kimitaka Ohshiro, and Akio YamamotoCite this: Organometallics 1991, 10, 2, 404–410Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February 1991https://pubs.acs.org/doi/10.1021/om00048a014https://doi.org/10.1021/om
Ethylene polymerization initiated by early-late transition-metal complexes afforded a polymer with different branched structures and properties depending on the type of late transition-metal.
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