bis(trimethylsilyl) chromate on montmorillonite K-10 in dichloromethane T=25°C; 0.166667 h;

1: 1-amino-2-nitro-4-methylbenzene With hydrogenchloride; sodium acetate; copper(II) sulfate; sodium sulfite; sodium nitrite in water T=0°C; 2: formaldehyd With hydroxylamine hydrochloride; sodium acetate in water 3: With hydrogenchloride in water Reflux;

sulfuric acid; nitric acid T=0°C; 1 h; Further byproducts given;

1: 1.) NaNO2, conc. aq. HCl / 1.) H2O, 30 min, 2.) H2O, 1.5 h 2: aq. HCl / Heating View Scheme

sulfuric acid; nitric acid T=0°C; 1 h; Further byproducts given;

sodium acetate; copper(II) sulfate; sodium sulfite in wss. Loesung und anschl. mit wss. HCl;

ammonium hydroxide; iron(II) sulfate in ethanol Heating;