FIELD: chemical industry. SUBSTANCE: described is new method of preparing compound of general formula I: 
wherein Ar is optionally substituted heteroaromatic group. Compound of general formula II: Ar-C(L′)2Cl /II/ wherein each of L′ substituents independently from each other is halogen atom, is reacted with water is the presence of Lewis acid and chlorohydrocarbon solvent which contains at least two chlorine atoms. EFFECT: simplified process. 6 cl, 5 ex, 1 tbl
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