1: 1.) lithium diisopropylamide, hexamethylphosphoramide / 1.) -78 deg C 2: 83 percent / 20percent sulphuric acid / tetrahydrofuran / 1 h 3: acetic anhydride / 52 h / 25 °C 4: 2.) 5percent sodium hydroxide / 1.) hexane, irradiation, 10 h, 2.) ethanol, 0 deg C, 2 h View Scheme

1: 80 percent / toluene-p-sulphonic acid 2: 1.) lithium diisopropylamide, hexamethylphosphoramide / 1.) -78 deg C 3: 83 percent / 20percent sulphuric acid / tetrahydrofuran / 1 h 4: acetic anhydride / 52 h / 25 °C 5: 2.) 5percent sodium hydroxide / 1.) hexane, irradiation, 10 h, 2.) ethanol, 0 deg C, 2 h View Scheme

1: acetic anhydride / 52 h / 25 °C 2: 2.) 5percent sodium hydroxide / 1.) hexane, irradiation, 10 h, 2.) ethanol, 0 deg C, 2 h View Scheme

1: 83 percent / 20percent sulphuric acid / tetrahydrofuran / 1 h 2: acetic anhydride / 52 h / 25 °C 3: 2.) 5percent sodium hydroxide / 1.) hexane, irradiation, 10 h, 2.) ethanol, 0 deg C, 2 h View Scheme

sodium hydroxide 1.) hexane, irradiation, 10 h, 2.) ethanol, 0 deg C, 2 h; Yield given. Multistep reaction. Yields of byproduct given;

sodium hydroxide 1.) hexane, irradiation, 2.) ethanol; Yield given. Multistep reaction. Yields of byproduct given;