1: 100 percent / dimethylformamide / 4 h / Heating 2: 99 percent / 20percent aqueous sodium hydroxide / 1 h / Heating 3: 1.) trichlorosilane, triethylamine 2.) 50percent aqueous sodium hydroxide / 1.) toluene, 5 min then reflux, 2 h 2.) toluene, ice cooling, 1 h View Scheme

1: 66 percent / toluene / 5 h / Heating 2: 100 percent / dimethylformamide / 4 h / Heating 3: 99 percent / 20percent aqueous sodium hydroxide / 1 h / Heating 4: 1.) trichlorosilane, triethylamine 2.) 50percent aqueous sodium hydroxide / 1.) toluene, 5 min then reflux, 2 h 2.) toluene, ice cooling, 1 h View Scheme

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

1: 99 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