1: 1.) 80percent H2O2 / 1.) -30 deg C to 25 deg C; 25 deg C, 10 min, 2.) CH2Cl2, -30 deg C to 25 deg C; 25 deg C, 4 h 2: 65 percent / CF3COOH / CH2Cl2 / 12 h / Ambient temperature 3: 80 percent Spectr. / CH2Cl2 / 3 h / Ambient temperature View Scheme

in dichloromethane 3 h; Ambient temperature;