FIELD: organic chemistry. SUBSTANCE: product: derivatives of dihydropyran of the formula (I): NHY-Ph-para-NH-C(O)-R hydrochloride where R - 2,4-dichloro-Ph-O-CH-; 2,4-dichloro-Ph-O--(CH2)2-;; 2,4-dichloro-Ph-O--(CH2)3; 4-methyl-2-chloro-Ph-O--(CH2)3-; Y - 4-methyl-5,6-dihydro-2H-pyran. Reaction conditions: compound of the formula (I) is synthesized from 4-methyl-5,6-dihydro-2H-pyran which is large-capacity waste in isoprene production by dioxane method. Synthesized product is used in agriculture, and effectiveness of compounds of the formula (I) exceeds that of atrazin being addition to the soil. EFFECT: increased effectiveness of the end products. 6 tbl
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