in benzene 0.5 h; Irradiation;

bromine in acetic acid

1: 67 percent / Bromine / acetic acid 2: 1.) sodium ethoxide, 2.) potassium tert-butoxide / 1.) reflux, 1 h, dimethyl sulfoxide, ethanol, 2.) 80 deg C, 30 min, tert-butyl alcohol View Scheme