N-bromosuccinmide; dibenzoyl peroxide in tetrachloromethane 36 h; HeatingIrradiation;

1: 95 percent / bromine / acetic acid / 0 °C 2: 79 percent / pyridine / 42 h / 230 °C / 1.) dry pyridine, 230 deg C, 42 h, 2.) ice, liquor ammonia, 3 h 3: 77 percent / NBS, dibenzoyl peroxide / CCl4 / 36 h / Heating; Irradiation View Scheme

1: 79 percent / pyridine / 42 h / 230 °C / 1.) dry pyridine, 230 deg C, 42 h, 2.) ice, liquor ammonia, 3 h 2: 77 percent / NBS, dibenzoyl peroxide / CCl4 / 36 h / Heating; Irradiation View Scheme