sodium hydroxide; bromine 2 h; steam bath;

1: 1.a) POCl3, 2.) saturated aq. K2CO3 / 1.a) < 10 deg C, 15 min, b) 2 h, 2.) ethanol, benzene, overnight 2: 46 percent / NaOMe / methanol / 2 h / Heating 3: 70 percent / aq. NaOH, Br2 / 2 h / steam bath View Scheme