1: With dimethylsulfide borane complex in dichloromethane T=20°C; 10 h; 2: With boron trichloride T=110°C; 2.75 h;

in dichloromethane (N2); silane/CH2Cl2 added dropwise to Me2S*BH3/CH2Cl2 at room temp. over40 min; stirred at room temp. for 10 h; evapd. (vac.); BCl3 added with stirring at 110°C; stirred at 110°C for 2 h; stirred at 11 0°C in 1-hexene for 30 min; cooled to room temp.; evapd. (vac.); distd. (79-93°C/15 mmHg);

-78 to 25°C, educts ratio 1:1; elem. anal.;