1: 60 percent / potassium hydroxide / H2O / 48 h / Heating 2: 81 percent / hydrobromic acid, acetic anhydride / 24 h / Heating 3: 100 percent / diethyl ether 4: 85 percent / sulfur tetrafluoride 5: 90 percent / potassium hydroxide / H2O; ethanol 6: 68 percent View Scheme

1: 60 percent / potassium hydroxide / H2O / 48 h / Heating 2: 81 percent / hydrobromic acid, acetic anhydride / 24 h / Heating 3: 100 percent / diethyl ether 4: 85 percent / sulfur tetrafluoride 5: 90 percent / potassium hydroxide / H2O; ethanol 6: 72 percent / tert-butyl hypoiodite / Irradiation 7: 38 percent / 96 h / Irradiation View Scheme

1: 60 percent / potassium hydroxide / H2O / 48 h / Heating 2: 81 percent / hydrobromic acid, acetic anhydride / 24 h / Heating 3: 100 percent / diethyl ether 4: 85 percent / sulfur tetrafluoride 5: 90 percent / potassium hydroxide / H2O; ethanol 6: 75 percent / borane-methyl sulfide 7: 90 percent 8: lithium triethylborohydride / tetrahydrofuran / 3 h / 65 °C View Scheme