1: 83 percent / di-isobutylaluminium hydride / benzene / 1 h / Ambient temperature 2: 99 percent / p-TsOH*H2O / benzene / 5 h / Heating 3: 80 percent / osmium tetraoxide, sodium metaperiodate / diethyl ether; H2O / 20 h 4: 75 percent / sodium cyanoborohydride / methanol / 0.67 h / Ambient temperature 5: 75 percent / p-TsOH*H2O / dioxane; H2O / 1.25 h / Heating 6: 47 percent / KOH / aq. ethanol / 0.58 h / Heating View Scheme