1: With sodium hydroxide; hydroxylamine hydrochloride in water T=15 - 20°C; pH=7.5; 2: chloroformic acid allyl ester With sodium hydroxide in water T=15 - 25°C; pH=7 - 8; 3: diethyl sulphate With sodium hydroxide in H20 T=30 - 35°C; pH=11; 5 h;