1: diethyl ether / 1.5 h / 0 °C 2: 17 percent / N-bromosuccinimide / aq. acetic acid / 1 h / 25 °C 3: 1.) H2, 2.) potassium carbonate / 1.) 5percent Pd-C / 1.) acetone 4: 80 percent / copper(II) nitrate / acetic anhydride / -20 °C View Scheme