in dimethyl sulfoxide T=140°C; 10 h; Yield given;

1: dimethylsulfoxide / 10 h / 140 °C 2: 64 percent / p-chloroperbenzoic acid, NaHCO3 / CHCl3; H2O 3: 71 percent / 5 percent perchloric acid / dioxane; H2O / 12 h / Ambient temperature 4: 86 percent / hydrogen / 10 percent Pd/C / ethanol / 12 h 5: 37 percent / Sodium periodate / methanol; H2O / 3 h / Ambient temperature View Scheme