Selective hydrosilylation of 1-alkynes with alkylsilanes catalyzed by rhodium in a carbon monoxide atmosphere

Hydrosilylation of 1-alkynes with PhMeSiH₂ andPh₂SiH₂ catalyzed by a highly active rhodiumspecies, generated in situ from rhodium under an atmospheric ofcarbon monoxide gave only (E)-vinylsilanes in excellent yield(>90%). In the absence of carbon monoxide, no reaction wasobserved under the same reaction conditions. Our Rh/CO catalytic systemleads to the (E)-stereoselectivity exclusively, while theRh₄(CO)₁₂ complex system produces only isomericproducts.