1: With boron trichloride in n-heptane; dichloromethane T=0 - 20°C; Inert atmosphere; 2: With dihydrogen peroxide; sodium hydroxide in n-heptane; dichloromethane; water T=20°C; Inert atmosphere; 3: With potassium hydroxide in ethanol T=20°C; 0.5 h;

methanol; silver fluoride T=20°C; DarknessInert atmosphere;