FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing an aromatic amide derivative of carboxylic acid of formula (2) 
and a novel intermediate compound for use in said method, represented by formula (1). The method includes a step for reaction of a halide derivative of an aromatic amide of formula (1) 
with carbon monoxide. In formulae (1) and (2) R1 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; X1 is a fluorine atom; X2 is a chlorine atom; and n is equal to 0 or 1.
EFFECT: obtaining an aromatic amide derivative of carboxylic acid with fewer process steps.
5 cl, 1 tbl, 18 ex
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