FIELD: organic chemistry. SUBSTANCE: method involves treatment of aminophenyl-4,5-dihydropyridazine-3(2H)-one with nitric acid followed by interaction of prepared diazonium compound with product of activated methylene group. 6-(4)-1,1-Dicyanomethylidenehydrazino-(phenyl)-4,5-dihydropyr- idazine-3(2H)-one is synthesized, m. p. is 283 C. Synthesized compound is used in medicine, in cardiology. EFFECT: improved method of synthesis. 3 tbl
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