1: C15H16O With Co(3-Me-5-MeO-salen) in acetonitrile T=-20 - 20°C; 0.166667 h; Inert atmosphere; 2: 2,2,6,6-tetramethyl-1-piperidinyloxy, free radical With dihydrogen peroxide in water; acetonitrile T=-20°C; 24 h; Inert atmosphere; 3: With hydrogenchloride in water; acetonitrile T=0 - 20°C; 0.25 h; Inert atmosphere;