1: With urea hydrogen peroxide addition compound; trifluoroacetic anhydride in chloroform T=0 - 20°C; 1 h; 2: With sodium thiosulfate in chloroform; water T=20°C; 0.666667 h;

trifluoroacetic anhydride in chloroform; ethyl acetate

triethylamine in acetonitrile T=100°C;