Abstract
Trisubstituted silanes, e.g., Me n (EtO) 3− n SiH (where n=0–2) and Me 2PhSiH in the presence of nickel complexes, e.g., [Ni(acac) 2] and [Ni(cod) 2], undergo two reactions of dehydrogenative silylation of styrene to yield in both cases an unsaturated product— E-1-phenyl-2-silyl-ethene as well as products of styrene hydrogenation—ethylbenzene DS-1 and of hydrogenative dimerization of styrene—1,3-diphenylbutane—DS-2. The two reactions are accompanied by the hydrosilylation products H as well as redistribution of the silanes containing at least one ethoxy substituent. The catalytic examinations and identification of nickel square planar complexes suggest that the intermediates containing Ni–Si (I), Ni–H (II) and Ni–C (III) bonds are responsible for the catalysis.
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