FIELD: chemical industry. SUBSTANCE: claimed method comprises contacting aliphatic amine or substituted derivative of aliphatic amine and nitrobenzene in the presence of suitable solvent system and reacting aliphatic amine or substituted derivative of aliphatic amine and nitrobenzene in the presence of suitable base and controllable amount of protonic material at suitable temperature in restrictive reaction zone. EFFECT: more efficient preparation method. 14 cl, 1 tbl
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