1: 60 percent / sodium ethylate / ethanol / 4 h / Heating 2: 1.) N-bromosuccinimide, water, 2.) 1N NaOH / 1.) ether, 5 d, 20 deg C, 2.) water, 4h, 20 deg C 3: methanol / 48 h / Heating 4: 27 percent / 1N hydrochloric acid / H2O / 1.) 24 h, 20 deg C, 2.) 3 h, 80 deg C View Scheme