1: N-Chlorosuccinimide, HCl / dimethylformamide / 0.25 h / 35 °C 2: Triethylamine / diethyl ether / 20 h / 20 °C 3: 39 percent / N-Bromosuccinmide, benzoyl peroxide / CCl4 / 1.17 h / Heating 4: 95 percent / Concentrated hydrochloric acid / acetic acid / 4 h / Heating View Scheme

hydrogenchloride; N-chloro-succinimide in N,N-dimethyl-formamide T=35°C; 0.25 h; Yield given;