1: 99 percent / n-Bu4NF / dimethylformamide 2: 99 percent / CH2Cl2 3: 92 percent / Zn / benzene / Heating 4: 83 percent / Dess-Martin periodinane / CH2Cl2 5: 96 percent / toluene / Heating 6: 99 percent / HF / acetonitrile 7: NaH / CH2Cl2 View Scheme