1: 8.5 percent / potassium acetate / acetic acid / 0.25 h / Heating 2: 96 percent / aq. 48percent HF / acetonitrile / 1.5 h / Ambient temperature 3: 70 percent / pyridinium chlorochromate / CH2Cl2 / 2.5 h 4: KHCO3 / methanol; H2O / Ambient temperature; further reagents View Scheme