1: With hydrazine T=-78 - 80°C; 2: With potassium hydroxide T=20 - 100°C; 18 h; 3: With hydrogenchloride in n-heptane; water T=0 - 20°C; 3.5 h;

1: With sodium hydroxide; water in toluene T=50 - 60°C; 4 h; 2: With hydrogenchloride in water; toluene T=20°C; pH=7; 18 h;