sodium hydroxide; ozone in dichloromethane T=-70°C;

1: 70 percent / ozone, methanolic NaOH / CH2Cl2 / -70 °C 2: 60 percent / NaBH4, Na2HPO4*12H2O / methanol / 1.) 0 deg C, 5 min, 2.) RT, 24 h View Scheme