1: hydrogenchloride / 20 °C 2: 1H-imidazole / dichloromethane / 25 - 30 °C 3: N-bromosuccinmide / acetone / -10 - 15 °C 4: sodium hydrogencarbonate; sodium hypochlorite; Aliquatreg; 336; potassium bromide; 2,2,6,6-tetramethyl-1-piperidinyloxy, free radical / dichloromethane / -10 - 20 °C 5: potassium carbonate / dichloromethane / -10 - 10 °C View Scheme