1: 72 percent / ZnBr2 / CH2Cl2 / 3 h / Ambient temperature 2: 96 percent / aq. NaOH / propan-2-ol / 0.5 h / 60 °C 3: 48 percent / benzenesulfonyl chloride, pyridine 4: 44 percent / Zn, dibromoethane / tetrahydrofuran / 1.12 h / Heating 5: 30 percent / SOCl2, pyridine / CH2Cl2 / 0.08 h / Heating 6: 76 percent / 50percent aq. HF / tetrahydrofuran / 18 h / Ambient temperature View Scheme