water; silica gel; zinc(II) chloride in chloroform Heating;

bromo-dimethylsulfonium bromide; triethylamine in dichloromethane 1 h; Ambient temperature;

1: triethylamine, cyanuric chloride / CCl4 / 1.) reflux, 2.) room temp. 2: 89 percent / SO2Cl2 / CH2Cl2 / -10 °C 3: 47 percent / water, silica gel, zinc chloride / CHCl3 / Heating View Scheme