1: 82 percent / 15 percent hydrochlorid acid / acetone / 0.25 h 2: 91 percent / NaBH4 / ethanol / 0.5 h / 0 °C 3: 92 percent / p-toluenesulfonic acid / CH2Cl2 / 0.5 h / 0 °C 4: LiAlH4 / diethyl ether / 0.5 h 5: CrO3; pyridine / CH2Cl2 / 0.25 h / 0 °C 6: 71 percent / benzene / 3 h 7: 32 percent / CrO3; water; conc. H2SO4 / acetone / 0.5 h / 0 °C View Scheme