Scheme 4. Substrate scope. Isolated yields after flash chromatography. ^a20 mol% B(C₆F₅)₃ was used. ^bPhSiH₃ was added in 5 hours delay after the initial EtMe₂SiH addition. ^cDihydrosilylated by PhSiH₃. ^dStirred at −40 °C for 5 h, and then 24 h at room temperature.