1: lithium aluminium tetrahydride / tetrahydrofuran / 24 h / 20 °C 2: carbon tetrabromide; triphenylphosphine / dichloromethane / 0.75 h / 0 °C 3: sodium methylate / methanol / 12 h / Reflux 4: sodium amalgam; disodium hydrogenphosphate / methanol / 24 h / Inert atmosphere View Scheme