FIELD: organic chemistry. SUBSTANCE: products: derivatives of uracil of the formula (I) where R1 - trifluoromethyl or pentafluoroethyl group; R2 - methyl, amino-group; Q represents one of the following group Q1-Q3 where R3 - hydrogen atom, methyl; R4, R5 and R6 each independently means C1-C4-alkyl unsubstituted or substituted with halogen, C3-C4-alkenyl unsubstituted or substituted with halogen, C3-C4-alkynyl, C1-4-alkoxy, C1-C3-alkyl; X - hydrogen or fluorine; Y - oxygen or sulfur atom. Condition: Q means Q3 then R2 - methyl, and also intermediate products for synthesis of uracil derivative. Herbicide composition has uracil derivatives at concentration 0.05-5.0 kg/ha, special additions, weed plants were treated with uracil derivatives at the dose 0.002-1 kg/ha. Synthesized compounds were used for chemical protection of plants. EFFECT: increased effectiveness of herbicides. 28 tbl
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