1: N-(2,4-dinitrophenyl)benzeneamine With hydrogen; palladium 10 on activated carbon in ethyl acetate 52 h; 2: formic acid With hydrogenchloride in water T=78 - 80°C; 22 h; Inert atmosphere; 3: With sodium hydroxide in water T=20°C; pH=12;

1: With hydrogenchloride in water T=100°C; 1.5 h; 2: With sodium hydroxide in water T=20°C; pH=~ 13;

hydrogenchloride; tin(ll) chloride

2: tin; concentrated hydrochloric acid View Scheme

hydrogenchloride; formic acid

1: alcohol; Na2S 3: tin; concentrated hydrochloric acid View Scheme