1: 97 percent / boron trichloride / CH2Cl2 / 1.) 0 deg C, 30 min; 2.) r.t., 30 min 2: sodium hydroxide / methanol; H2O 3: 78 percent / copper(I) oxide, 2,2'-bipyridyl, N,N-dimethylaniline / 1 h / Heating View Scheme

1: 97 percent / boron trichloride / CH2Cl2 / 1.) 0 deg C, 30 min; 2.) r.t., 30 min 2: sodium hydroxide / methanol; H2O 3: 78 percent / copper(I) oxide, 2,2'-bipyridyl, N,N-dimethylaniline / 1 h / Heating 4: bromine / CCl4 / 0.08 h View Scheme

With  boron trichloride in  dichloromethane  1.) 0 deg C, 30 min; 2.) r.t., 30 min;   

Multi-step reaction with 2 steps 1: 97 percent / boron trichloride / CH2Cl2 / 1.) 0 deg C, 30 min; 2.) r.t., 30 min2: sodium hydroxide / methanol; H2O