hydrogen bromide in dichloromethane 6 h; Ambient temperature;

1: 100 percent / bis(triphenylphosphine)palladium dichloride, copper(I) iodide, diethylamine / 17 h / Heating 2: 99 percent / sodium hydroxide / toluene / 17 h / Heating 3: 97 percent / hydrogen bromide (gas) / CH2Cl2 / 6 h / Ambient temperature View Scheme

1: 99 percent / sodium hydroxide / toluene / 17 h / Heating 2: 97 percent / hydrogen bromide (gas) / CH2Cl2 / 6 h / Ambient temperature View Scheme