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Title
Japanese:Scope and reaction mechanism of an aerobic oxidative alkyne homocoupling catalyzed by a di-copper-substituted silicotungstate. 
English:Scope and reaction mechanism of an aerobic oxidative alkyne homocoupling catalyzed by a di-copper-substituted silicotungstate. 
Author
Japanese: Noritaka Mizuno, Keigo Kamata, Yoshinao Nakagawa, Takamichi Oishi, Kazuya. Yamaguchi.  
English: Noritaka Mizuno, Keigo Kamata, Yoshinao Nakagawa, Takamichi Oishi, Kazuya. Yamaguchi.  
Language English 
Journal/Book name
Japanese:Catalysis Today 
English:Catalysis Today 
Volume, Number, Page Vol. 157    No. 1-4    pp. 359-363
Published date 2010 
Publisher
Japanese:Elsevier B.V. 
English:Elsevier B.V. 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.cattod.2010.02.073
Abstract The di-copper-substituted ﾎｳ-Keggin-type silicotungstate TBA4[ﾎｳ-H2SiW10O36Cu2(ﾎｼ-1,1-N3)2] (I, TBA = tetra-n-butylammonium) could act as an efficient reusable homogeneous catalyst for the aerobic oxidative alkyne homocoupling. Various kinds of structurally diverse terminal alkynes including arom., heteroarom., aliph., double bond-contg., silylacetylene, propargylic alc., and propargylic amine derivs. could selectively be converted into the corresponding diynes in the presence of I. The catalytic activity of I was much higher than those of the mono-copper-substituted silicotungstate, monomeric copper complexes, and simple copper salts, showing that the di-copper core in I plays an important role in the present alkyne homocoupling. The reaction mechanism involving the formation of the di-copper(II)-alkynyl intermediate, reductive elimination of a diyne, and re-oxidn. of reduced copper species by O2 has been proposed. [on SciFinder(R)]

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