Ruthenium-catalyzed hydrosilylation of alkynes with preservation of the Si–Si bond of hydrooligosilanes: Regio- and stereoselective synthesis of (Z)-alkenyloligosilanes and carbonyl-functionalized alkenyldisilanes

Abstract

Ruthenium-catalyzed Z-selective hydrosilylation of alkynes afforded alkenyloligosilanes with high regio- and stereoselectivity without Si–Si bond cleavage. Among examined catalysts, RuHCl(CO)(PPh3)(dppp) was found to be the most suitable for the Z-selective hydrosilylation. A deuterium labeling experiment suggests the existence of a vinylideneruthenium species which is the key intermediate for the Z-selectivity. By using this method as well as previously reported E- and α-selective hydrosilylation, (E)-, (Z)- and α-alkenyldisilanes bearing carbonyl functionality were selectively synthesized.