hydrogen bromide in acetic acid 0.166667 h; Ambient temperature;

1: 93 percent / TBA(+)Cl(-) / PdCl2 / CH2Cl2; aq. HCl / 5 h / Ambient temperature 2: 95 percent / 37percent HBr / acetic acid / 0.17 h / Ambient temperature View Scheme

sodium hydroxide; hydrogen bromide 1) aq EtOH, R.T., 1 h 2) Et2O; Yield given. Multistep reaction;