FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method for preparing 1-phenyl-4-methyl-4-hydroxymethylpyrazolidone-3 (dimezone S) used as developer for photomaterials. Invention proposes to prepare 1-phenyl-4-methyl-4-hydroxypyrazolidone-3 from its salt of 2,2- dihydroxymethylpropionic phenylhydrazine forming in interaction of phenylhydrazine and 2,2- dihydroxymethylpropionic acid in solvent at temperature 80-100 C followed by filtration and washing out with inert solvent on filter. Invention provides the increased yield, reduced consumption coefficient by raw, reduced reaction time and enhanced quality of 1-phenyl-4-methyl-4-hydroxymethylpyrazolidone-3. EFFECT: improved preparing method. 2 ex
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