1: 97 percent / thionyl chloride / 5 h / Heating 2: 90 percent / diethyl ether; benzene / 12 h / 20 °C 3: 85 percent / 67percent hydriodic acid / CHCl3 / 0.33 h / -5 °C 4: 81 percent / boron trifluoride-ether / diethyl ether / 1.) -10 deg C, 1 h, 2.) room temperature, 3 days 5: 85 percent / Raney nickel (W-1 activity) / acetone / 6 h / Heating 6: 65 percent / conc. HCl / acetic acid / 6 h / Heating View Scheme