Multiple mechanistic pathways for zirconium-catalyzed carboalumination of alkynes. Requirements for cyclic carbometalation processes involving CH activation

E Negishi, DY Kondakov, D Choueiry…

文献索引：Negishi, Ei-Ichi; Kondakov, Denis Y.; Choueiry, Daniele; Kasai, Kayoko; Takahashi, Tamotsu Journal of the American Chemical Society, 1996 , vol. 118, # 40 p. 9577 - 9588

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被引用次数: 144

摘要

The reactions of internal and terminal alkynes with organoalanes containing Et, n-Pr, and i- Bu groups in the presence of Cp2ZrCl2 and MeZrCp2Cl were investigated with the goal of clarifying mechanistic details of some representative cases. Three fundamentally different processes, ie,(i) CM bond addition without CH activation in the alkyl group,(ii) cyclic CM bond addition via CH activation, and (iii) hydrometalation, have been observed, and the ...