1: 100 percent / diethyl ether 2: 85 percent / sulfur tetrafluoride 3: 90 percent / potassium hydroxide / H2O; ethanol 4: 1.) thionyl chloride, 2.) NH3 / 2.) ether, 0 deg C, 20-30 min View Scheme

1: 81 percent / hydrobromic acid, acetic anhydride / 24 h / Heating 2: 100 percent / diethyl ether 3: 85 percent / sulfur tetrafluoride 4: 90 percent / potassium hydroxide / H2O; ethanol 5: 1.) thionyl chloride, 2.) NH3 / 2.) ether, 0 deg C, 20-30 min 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: 1.) thionyl chloride, 2.) NH3 / 2.) ether, 0 deg C, 20-30 min View Scheme

1: 85 percent / sulfur tetrafluoride 2: 90 percent / potassium hydroxide / H2O; ethanol 3: 1.) thionyl chloride, 2.) NH3 / 2.) ether, 0 deg C, 20-30 min View Scheme

thionyl chloride; ammonia 2.) ether, 0 deg C, 20-30 min; Yield given. Multistep reaction;

pyridine; trifluoroacetic anhydride in 1,4-dioxane T=10°C;