in hydrogen bromide

1: 78 percent / pyridine / 2 h / Ambient temperature 2: diethyl ether; tetrahydrofuran / 12 h / Ambient temperature 3: phenol, 48percent aq. HBr / 7 h / Heating View Scheme

1: diethyl ether; tetrahydrofuran / 12 h / Ambient temperature 2: phenol, 48percent aq. HBr / 7 h / Heating View Scheme

hydrogen bromide; phenol 7 h; Heating;