1: H2 / Adams' platinum oxide / methanol 2: 63.7 percent / pyridinium chlorochromate, sodium acetate / CH2Cl2 / 1 h / Ambient temperature 3: 27.3 percent / n-BuLi / hexane; tetrahydrofuran / 1.) -20 deg C, 1 h, 2.) -20 deg C, 1 h; r.t., 1 h 4: 58.1 percent / H2 / palladium-charcoal / ethanol; hexane View Scheme