1: 89 percent / diethyl ether / 1 h 2: 40 percent / KMnO4, MgSO4 / H2O / 1 h / Heating 3: 1.) CH3Li, t-butyllithium, 2.) allyl iodide / 1.) THF, -78 deg C, 1 min, 2.) THF, -78 deg C, 5 min View Scheme

1: 89 percent / diethyl ether / 1 h 2: 40 percent / KMnO4, MgSO4 / H2O / 1 h / Heating 3: 1.) CH3Li, t-butyllithium, 2.) allyl iodide / 1.) THF, -78 deg C, 1 min, 2.) THF, -78 deg C, 5 min View Scheme

1: 40 percent / KMnO4, MgSO4 / H2O / 1 h / Heating 2: 1.) CH3Li, t-butyllithium, 2.) allyl iodide / 1.) THF, -78 deg C, 1 min, 2.) THF, -78 deg C, 5 min View Scheme