FIELD: organic synthesis. SUBSTANCE: described are new 5-acyl derivatives of N-alkylbenzomonoagacrown compounds of general formula I: 
wherein R2 is lower alkyl; R2 is H or lower alkyl; n is 1,2,3 or 4, and also method of preparing thereof. Invention is useful in synthesis of selective reagent into metal cations and ammonium cations. EFFECT: more efficient preparation method. 3 cl, 12 ex
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