Scheme 7. Comparison of the influence of hydrosilanes on alkyne hydrosilylation and vinylsilane hydrosilylation. aHydrosilylation of phenylacetylene 1a: performed at −40 °C with 10 mol% B(C6F5)3 in 0.4 mmol scale. bHydrosilylation of vinylsilane 3aa: performed at −20 °C with 5 mol% B(C6F5)3 in 0.2 mmol scale. cDihydrosilylated product formed with Et2SiH2, see Table S1† for details.
