1: With ozone in dichloromethane T=-78°C; 0.25 h; 2: With formic acid; dihydrogen peroxide in dichloromethane T=20°C; 0.25 h;

1: With ozone in dichloromethane T=-78°C; 0.25 h; 2: With formic acid; dihydrogen peroxide in dichloromethane T=20°C; 0.25 h;