1: 93 percent / pyridinium chlorochromate / CH2Cl2 / 12 h 2: 99 percent / triethylamine / dimethylformamide / Heating 3: 1.) H2O, p-toluenesulfonic acid, 2.) periodic acid / 1.) CH3OH, reflux, 1 h, 2.) CH3OH, RT, 2 h View Scheme