FIELD: chemistry.
SUBSTANCE: invention relates to an improved method of producing S-phosphorylated dinitriles of malonic acid of formula (I), which can be used to produce biologically active compounds for medical and agricultural purposes. In formula 
where R=CH3,C2H5,C4H9. The method involves obtaining a sodium derivative of malonic acid dinitrile by reacting malonic acid dinitrile with sodium ethylate, followed by phosphorylation of the obtained sodium derivative with dialkyl chlorophosphate, selected from dimethyl chlorophosphate, diethyl chlorophosphate or dibutyl chlorophosphate, in the medium of diethyl ether with molar ratio malonic acid dinitrile: sodium ethylate: dialkyl chlorophosphate=1:1:1-1.1, respectively, and temperature 20-34°C.
EFFECT: simple process of obtaining end products with high output and wider range of chemical compounds.
3 ex
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