FIELD: organic chemistry, insecticides.
SUBSTANCE: invention relates to compounds of the formula (I): 
wherein Ar1 and Ar2 mean independently of one another unsubstituted phenyl of mono- or multi-substituted phenyl wherein its substitutes are chosen from group comprising halogen atom, (C1-C6)-alkyl, halide-(C1-C6)-alkyl or halide-(C1-C6)-alkoxy-group; R4, R5 and R6 mean independently of one another hydrogen atom or (C1-C6)-alkyl; W mean oxygen atom (O); X means -N(R10) wherein R10 means hydrogen atom; a = 1; b = 0. Also, invention relates to a method for synthesis of compounds of the formula (I). Method involves interaction of compound of the formula (II): 
with compound of the formula Ar1-NCO optionally in the presence of a basic catalyst. Except for, invention comprises a composition designated for control of parasites chosen from group including helminthes, mites, parasite-like mites and insects wherein this composition contains at least one compound of the formula (I) as an active substance and carriers and/or dispersing agents also. Also, invention relates to using compounds of the formula (I) for control of indicated parasites and to a method for control of parasites that involves effect on parasites with the effective dose of at least one compound of the formula (I). Also, invention relates to using compound of the formula (I) for control of parasites and for preparing pharmaceutical composition with effect directed against parasites chosen from group including helminthes, mites, parasite-like mites and insects in worm-blood animals.
EFFECT: improved method of synthesis, valuable insecticide properties of compounds and composition.
8 cl, 1 tbl, 3 ex
