sodium hydroxide; hydroxylamine hydrochloride in water T=0 - 100°C;

1: T=100°C; 0.5 h; 2: With N,N-dimethyl-formamide; trichlorophosphate in 1,2-dichloro-ethane T=0°C; 16.25 h; Reflux; 3: With sodium acetate in water; 1,2-dichloro-ethane T=100°C; 0.333333 h;