1: sodium hydroxide / 1,4-dioxane; water / 2 h / 60 °C 2: sodium periodate / methanol / 0.75 h / Cooling with ice 3: carbon tetrabromide; potassium carbonate; triphenylphosphine / dichloromethane / 0.25 h / 10 °C / Inert atmosphere 4: palladium 10 on activated carbon; hydrogen / methanol / 2 h / 20 °C / 3102.97 Torr / Inert atmosphere View Scheme