1: 1-amino-2-nitro-4-methylbenzene With hydrogenchloride; C25H20N6O6S2; sodium nitrite in water T=10°C; 1 h; 2: 1-(N-phenylcarbamyl)propan-2-one With sodium acetate; acetic acid in water T=25 - 90°C; pH=6; 2.5 h;

1: o-tolidine-6,6'-disulfonic acid; 1-amino-2-nitro-4-methylbenzene With hydrogenchloride; sodium nitrite in water T=10°C; 1 h; 2: 1-(N-phenylcarbamyl)propan-2-one With sodium hydroxide; sodium acetate; acetic acid in water T=25 - 90°C; pH=6; 2.5 h;