potassium tert-butylate in dimethyl sulfoxide T=50°C; 12 h;

phenyl(tribromomethyl)mercury in benzene T=75 - 80°C; 4 h;

1: 80 percent / PBr3/PBr5 / 19 h / Ambient temperature 2: 30 g / ZnBr2 / pentane / 168 h / Ambient temperature 3: 14.2 g / t-BuOK / dimethylsulfoxide / 24 h / Ambient temperature View Scheme

1: 30 g / ZnBr2 / pentane / 168 h / Ambient temperature 2: 14.2 g / t-BuOK / dimethylsulfoxide / 24 h / Ambient temperature View Scheme