1: 84 percent / CHCl3; pyridine / 25 °C 2: 100 percent / KIO4 / Osmium tetraoxide / ethyl acetate; H2O / 7.5 h 3: Jones reagent / acetone / 0.33 h 4: 99 percent / 1 N HCl / dioxane / 100 °C View Scheme

acetic anhydride in chloroform

in pyridine; chloroform T=25°C;