FIELD: organic chemistry, chemical technology. SUBSTANCE: invention describes method of synthesis of derivatives of pyrazole of the formula (I) 
performing by interaction of carbonyl compound of the formula (II) 
with hydrazine, its hydrate or its salts in 30-100 wt.-% sulfuric acid in the presence of catalytic amount of iodine or iodine compound. Synthesis is carried out for a single stage. EFFECT: improved and simplified method of synthesis. 9 cl
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