1: With ozone in methanol; dichloromethane T=-78°C; 0.0833333 h; Inert atmosphere; 2: With dimethylsulfide in methanol; dichloromethane T=-78 - 22°C; 4 h; Inert atmosphere;

sodium hydrogencarbonate in 1,4-dioxane T=0 - 20°C; 23 h; Inert atmosphere;