History and Types of Catalyst

Rhodium complexes also catalyze the hydrosilylation of olefins, and one of the earliest soluble catalysts used for hydrosilylation was Wilkinson s catalyst. - As is described in more detail below, the mechanisms for hydrosilylation catalyzed by rhodium complexes differ from those catalyzed by platinum complexes. Olefin insertion occurs into different ligands in the two mechanisms. The rhodium-catalyzed processes occiu by a so-called modified Chalk-Harrod mechanism. Rhodium complexes were also among tlie first complexes used for the asymmetric hydrosilylation of ketones.  

Palladium complexes also catalyze hydrosilylation, and particular emphasis has been placed on the use palladium catalysts for asymmetric hydrosilylation. The most selective of these catalysts contains a binaphthyl monophosphine ligand. - Finally, lanthanides have also been used for hydrosilylation. Lanthanide-metallocene catalysts can be highly active for the hydrosilylation of olefins, and lanthanides bearing chiral ligands catalyze asymmetric hydrosilylation with measurable enantiomeric excess.  

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