1: KF / methanol 2: KI / acetone 3: H2 / Lindlar catalyst 4: (i) aq. HClO4, THF, (ii) piperidine, AcOH 5: NaBH4 6: aq. CrO3 7: H2O / dimethylsulfoxide / 4 h / 176 °C View Scheme

potassium carbonate in cyclohexane T=60°C; Horner-Wadsworth-Emmons reaction; 1 h;

118 h; electrochemical oxidation: Pt electrodes, Et4NClO4, 1.5 amps;

sulfuric acid T=25°C; 18 h;