Formation of allylsilanes from Cl2[P(C6H11)3]2RuC(R)H and vinylsilanes—β-SiR′3 elimination from ruthenacyclobutanes as a terminating step in olefin cross-metathesis

Stoichiometric reactions of the Grubbs carbene complex [Cl2{P(C6H11)3} 2RuC(Ph)H] with vinylsilanes, H2CC(SiMenR3−n )H (R = Ph, OEt; n = 1, 2, 3), afford metathesis products and allylsilanes formed by β-SiR3 elimination followed by reductive elimination; the formation of allylsilanes constitutes a terminating step in the Ru-catalysed cross-metathesis of olefins with methylsubstituted vinylsilanes.