N-Heterocyclic Carbene Complexes of Nickel as Efficient Catalysts for Hydrosilylation of Carbonyl Derivatives

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Abstract

Well-defined nickel(II) complexes bearing bidentate tetramethylcyclopentadienyl-functionalised N-heterocyclic carbene ligands (Cp*-NHCMe)NiX (X=Cl, O-t-Bu) have been prepared and applied as efficient catalysts for the hydrosilylation of carbonyl groups. The nickel-alkoxide (Cp*-NHCMe)Ni(O-t-Bu) complex displayed remarkable catalytic activity in the reduction of aldehydes, affording quantitative conversion to the corresponding alcohols in 5 min at 25 degrees C. Mechanistic studies, based on stoichiometric reactions, revealed that the transient nickel hydride (Cp*-NHCMe)NiH complex is the active species in the hydrosilylation of carbonyls.
Original languageUnknown
Pages (from-to)2613-2618
JournalAdvanced Synthesis & Catalysis
Volume354
Issue number14-15
DOIs
Publication statusPublished - 1 Jan 2012

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