FIELD: synthesis of heterocyclic compounds. SUBSTANCE: process for preparing 1,2,4-triazol-5-one is characterized by reacting of semicarbazide with mixture of hydrochloric and formic acids used in their molar ratio of 0.5 to 0.75: 2, respectively, under refluxing the resulting reaction mixture for 2-3 hours, with molar ratio of semicarbazide to acid mixture being of 1: 2.5 to 2.75. EFFECT: increased yield and quality of the end product. 1 tbl
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