1: 95 percent / methanol / 4 h / Heating 2: 90 percent / lead(IV)-acetate / benzene / 12 h / 25 °C 3: 50 percent / 1. NaHMDS / tetrahydrofuran / 1. 1h reflux 2. -78 deg C, 1h 3. 25 deg C, 20h View Scheme

1: 95 percent / methanol / 4 h / Heating 2: 90 percent / lead(IV)-acetate / benzene / 12 h / 25 °C 3: 50 percent / 1. NaHMDS / tetrahydrofuran / 1. 1h reflux 2. -78 deg C, 1h 3. 25 deg C, 20h 4: LiAlH4 / diethyl ether / 3 h / 25 °C 5: 80 percent / PBr3 / 1 h / 85 °C View Scheme

1: 98 percent / conc. sulfuric acid / 24 h / Heating 2: 70 percent / lead tetraacetate / benzene 3: n-BuLi / toluene / 2 h / 25 °C 4: lithium aluminium hydride / tetrahydrofuran / 4 h / Heating 5: PBr3 6: 98 percent / acetonitrile / 24 h / Heating 7: NaOEt / tetrahydrofuran / 1 h / 25 °C 8: n-BuLi / toluene / 2 h / 25 °C View Scheme

1: 52.5 g / 5percent methanolic HCl / 48 h / Ambient temperature 2: 38 g / NaIO4 / ethanol; H2O / 1 h / 35 °C 3: 101 g / pyridine / 1.) RT, 24 h, 2.) reflux, 4 h 4: 40 g / 10percent aq. NaOH / 4 h / Heating 5: 55 percent / 60percent H2SO4 / 2.5 h / 130 °C 6: 70 percent / polyphosphoric acid / 2.5 h / 100 °C 7: 22.5 g / 15percent methanolic HCl / 30 h / Ambient temperature 8: 9.62 g / NaBH4 / methanol / 2 h / Ambient temperature 9: 35 percent / t-butyl chromate / CCl4 / 24 h / Heating 10: 3.25 g / aluminium isopropoxide / propan-2-ol / 6 h / Heating 11: 3.2 g / POCl3 / benzene / 2.5 h / Ambient temperature 12: 1.86 g / NaOH / methanol; H2O / 2 h / Heating 13: 1.6 g / Jones' reagent / acetone / 0.17 h / -10 °C 14: 0.96 g / diethyl ether 15: 0.28 g / AcOH-water-THF (60:25:15) / 8 h / Ambient temperature View Scheme

1: 52.5 g / 5percent methanolic HCl / 48 h / Ambient temperature 2: 38 g / NaIO4 / ethanol; H2O / 1 h / 35 °C 3: 101 g / pyridine / 1.) RT, 24 h, 2.) reflux, 4 h 4: 40 g / 10percent aq. NaOH / 4 h / Heating 5: 55 percent / 60percent H2SO4 / 2.5 h / 130 °C 6: 70 percent / polyphosphoric acid / 2.5 h / 100 °C 7: 22.5 g / 15percent methanolic HCl / 30 h / Ambient temperature 8: 9.62 g / NaBH4 / methanol / 2 h / Ambient temperature 9: 35 percent / t-butyl chromate / CCl4 / 24 h / Heating 10: 3.25 g / aluminium isopropoxide / propan-2-ol / 6 h / Heating 11: 3.2 g / POCl3 / benzene / 2.5 h / Ambient temperature 12: 1.86 g / NaOH / methanol; H2O / 2 h / Heating 13: 1.6 g / Jones' reagent / acetone / 0.17 h / -10 °C 14: 0.96 g / diethyl ether View Scheme

1: 52.5 g / 5percent methanolic HCl / 48 h / Ambient temperature 2: 38 g / NaIO4 / ethanol; H2O / 1 h / 35 °C 3: 101 g / pyridine / 1.) RT, 24 h, 2.) reflux, 4 h 4: 40 g / 10percent aq. NaOH / 4 h / Heating 5: 55 percent / 60percent H2SO4 / 2.5 h / 130 °C View Scheme

sodium periodate in 1,4-dioxane; water T=20°C; 1.33333 h;

1: 52.5 g / 5percent methanolic HCl / 48 h / Ambient temperature 2: 38 g / NaIO4 / ethanol; H2O / 1 h / 35 °C 3: 101 g / pyridine / 1.) RT, 24 h, 2.) reflux, 4 h 4: 40 g / 10percent aq. NaOH / 4 h / Heating 5: 55 percent / 60percent H2SO4 / 2.5 h / 130 °C 6: 70 percent / polyphosphoric acid / 2.5 h / 100 °C View Scheme