Pyridine-iminophosphorane Earth-abundant metal complexes: synthesis and application in catalytic ketone hydrosilylation.

Abstract

A series of FeII, CoII, and NiII complexes, supported by a pyridine-iminophosphorane ligand, has been synthesised and characterised. Two different ligand structures labeled L1R and L2R were employed. Most complexes were analysed by X-ray diffraction and show a tetrahedral geometry. The activity of these complexes was compared for the hydrosilylation of acetophenone upon activation with KHBEt3. Under the initial conditions, CoII and FeII complexes performed moderately and NiII derivatives were almost inactive. The reaction was then optimised with an easily accessible Co complex which catalyses at 1 mol% the hydrosilylation of a range of aromatic and aliphatic ketones at room temperature in toluene in the presence of 1 mol% KHBEt3 and one equivalent of SiH2Ph2.

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