in tetrahydrofuran T=-80 - 20°C; 1 h;

in tetrahydrofuran T=20°C; Grignard reaction; 3 h;

sodium hydroxide; trichlorosilane; triethylamine 1.) toluene, 5 min then reflux, 2 h 2.) toluene, ice cooling, 1 h; Yield given. Multistep reaction;

1: 82 percent / 20percent aqueous sodium hydroxide / 1 h / Heating 2: 1.) trichlorosilane, triethylamine 2.) 50percent aqueous sodium hydroxide / 1.) toluene, 5 min then reflux, 2 h 2.) toluene, ice cooling, 1 h View Scheme