Hydrosilylation of Dihydrosilylium Ion Stabilized by Coordination of a σ‐Donating Ni(0) Ligand
Abstract
Abstract The hydrosilylation reactions of dihydrosilylium ion 2 , stabilized by coordination of a σ‐donating Ni(0) fragment, has been investigated. Complex 2 with two reactive sites, dihydrosilylium and Ni(0) centers, readily reacts with diphenylacetylene via a selective mono‐hydrosilylation reaction to afford the corresponding Ni(0)‐stabilized (hydro)(vinyl)silylium ion 6 . In the case of ethylene, three equivalents of olefin are consumed to give a cationic Ni(II)‐complex 7 featuring a Bu‐Si + ‐Ni II ‐Et moiety with a NHC‐supported Si atom. DFT calculations indicate that the hydrosilylation proceeds by a classical (Chalk‐Harrod type) mechanism with the assistance of NHC ligand moving between Si and Ni centers according to their stabilization requirements.
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SiH2NiNHC_hydrosilylation - Accepted article (1).pdf (757.62 Ko)
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