hydrogenchloride; potassium permanganate; sulfuric acid; sodium carbonate 1.) (pH=7), 30 deg C, water, 2 h; 2.) (pH=5-6), T < 20 deg C, CH2Cl2;

1: Na2CO3 / acetonitrile / 8 h / Heating 2: 84.6 percent / acetonitrile / 68 h / Ambient temperature View Scheme