FIELD: chemistry.
SUBSTANCE: invention relates to an improved method for alkylating a phenyl ring of diphenylamine. The method involves reaction of diphenylamine with an alkylating agent selected from straight of branched olefin in an inert atmosphere in the presence of an ionic liquid which contains a Lewis acid, selected from a metal halide, a quaternary cation selected from a quaternary ammonium cation, an alkylimidazolium cation, an alkyltriazolium cation and an alkylpyridinium cation, to obtain an alkylated derivative of diphenylamine.
EFFECT: method simplifies extraction of the end product from the reaction mass.
11 cl
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