Regio- and Stereoselective Hydrosilylation of Alkynes Catalyzed by Three-Coordinate Cobalt(I) Alkyl and Silyl Complexes
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https://figshare.com/articles/dataset/Regio_and_Stereoselective_Hydrosilylation_of_Alkynes_Catalyzed_by_Three_Coordinate_Cobalt_I_Alkyl_and_Silyl_Complexes/2224570
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资源简介：
A three-coordinate cobalt(I) complex
exhibits high catalytic efficiency
and selectivity as well as good functional group compatibility in
alkyne hydrosilylation. [Co(IAd)(PPh3)(CH2TMS)] (1) (IAd = 1,3-diadamantylimidazol-2-ylidene)
facilitates regio- and stereoselective hydrosilylation
of terminal, symmetrical internal, and trimethylsilyl-substituted
unsymmetrical internal alkynes to produce single hydrosilylation
products in the forms of β-(E)-silylalkenes,
(E)-silylalkenes, and (Z)-α,α-disilylalkenes,
respectively, in high yields. The comparable catalytic efficiency
and selectivity of the Co(I) silyl complex [Co(IAd)(PPh3)(SiHPh2)] that was prepared from the reaction
of 1 with H2SiPh2, and the isolation
of an alkyne Co(I) complex [Co(IAd)(η2-PhCCPh)(CH2TMS)] from the reaction of 1 with the acetylene,
point out a modified Chalk–Harrod catalytic cycle for these
hydrosilylation reactions. The high selectivity is thought
to be governed by steric factors.
创建时间：
2016-02-16
