1: 1) NaoH, 2) HCl / ethanol / 24 h / Heating 2: 1.42 h / 160 °C 3: 69 percent / 0.38 N HCl / 1 h / Ambient temperature 4: 1) Ag2O, MeOH, 2) Br2, 3) Zn / 2) CCl4, 3) HOAc, reflux, 2 h 5: alkalin View Scheme