T
Tamotsu Takahashi
Researcher at Hokkaido University
Publications - 492
Citations - 10757
Tamotsu Takahashi is an academic researcher from Hokkaido University. The author has contributed to research in topics: Catalysis & Enantioselective synthesis. The author has an hindex of 51, co-authored 490 publications receiving 10362 citations. Previous affiliations of Tamotsu Takahashi include Purdue University & Peking University.
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Reaction of zirconocene dichloride with alkyllithiums or alkyl grignard reagents as a convenient method for generating a “zirconocene” equivalant and its use in zirconium-promoted cyclization of alkenes, alkynes, dienes, enynes, and diynes☆
TL;DR: In this paper, the treatment of Cl2ZrCp2 with 2 equiv of alkylmetals (RM) containing Li or Mg, e.g., n-BuLi, in THF produces organozirconium species that act as sources of ZrC p2, the latter product being a convenient reagent for preparing zirconacycles.
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Metal-promoted cyclization. 19. Novel bicyclization of enynes and diynes promoted by zirconocene derivatives and conversion of zirconabicycles into bicyclic enones via carbonylation
Ei-ichi Negishi,Steven J. Holmes,James M. Tour,Joseph A. Miller,Fredrik E. Cederbaum,Douglas R. Swanson,Tamotsu Takahashi +6 more
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Patterns of Stoichiometric and Catalytic Reactions of Organozirconium and Related Complexes of Synthetic Interest
TL;DR: In this paper, the reactions of organometallic zirconium compounds are reviewed and a specific interest is placed on reactions where C-C bonds are formed, where the authors focus on the reactions where the C-c bond is formed.
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Palladium- or nickel-catalyzed reactions of alkenylmetals with unsaturated organic halides as a selective route to arylated alkenes and conjugated dienes: scope, limitations, and mechanism
TL;DR: In this article, the turnover numbers for the palladium-catalyzed reactions of PhI with (E)-1-octenylmetals containing Al, Zr, and Zn were 2, 3, and > 2000 mmol of Pd(PPh/sub 3/)/sub 4/ per hour at room temperature, respectively.
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Selective preparation of pyridines, pyridones, and iminopyridines from two different alkynes via azazirconacycles.
Tamotsu Takahashi,Fu-Yu Tsai,Yanzhong Li,Hui Wang,Yoshihiko Kondo,Masamichi Yamanaka,Kiyohiko Nakajima,Martin Kotora +7 more
TL;DR: This method was applied for the formation of pyridones and iminopyridines using isocyanate and carbodiimide derivatives instead of nitriles, respectively and gave tetrasubstituted pyridine derivatives as single products.