Volume 132, Issue 4 pp. 1568-1572
Zuschrift

Cobalt-Catalyzed E-Selective Cross-Dimerization of Terminal Alkynes: A Mechanism Involving Cobalt(0/II) Redox Cycles

Yohei Ueda

Yohei Ueda

Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan

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Prof. Dr. Hayato Tsurugi

Corresponding Author

Prof. Dr. Hayato Tsurugi

Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan

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Prof. Dr. Kazushi Mashima

Corresponding Author

Prof. Dr. Kazushi Mashima

Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan

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First published: 11 November 2019
Citations: 5

Abstract

A highly E-selective cross-dimerization of terminal alkynes with either terminal silylacetylenes, tert-butylacetylene, or 1-trimethylsilyloxy-1,1-diphenyl-2-propyne in the presence of a dichlorocobalt(II) complex bearing a sterically demanding 2,9-bis(2,4,6-triisopropylphenyl)-1,10-phenanthroline, activated with two equivalents of EtMgBr, gives a variety of (E)-1,3-enynes. A well-characterized diolefin/cobalt(0) complex, with divinyltetramethyldisiloxane, acted as a catalytically active species without any activation, clearly indicating that a cobalt(0) species is involved in the catalytic cycle.

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