1: With [N-(trifluoromethylsulfonyl)imino][4-(trifluoromethyl)phenyl]-λ3-bromane T=20°C; 1 h; Inert atmosphere; 2: With hydrogenchloride in water 2 h; Inert atmosphere;

oxygen; Titanium(IV) oxide; silver sulphate in acetonitrile T=20°C; 3 h; UV-irradiation;