METHOD OF PREPARING PYRAZOLIDONES-3

摘要

FIELD: developers for pholographic materials. SUBSTANCE: method comprises isolating intermediate pyrazolidone-3 salt resulting from reaction of phenyl hydrazine with acrylic or methacrylic acid esters in the presence of alkali metal alcoholate is isolated by addition of water or aqueous aldehyde solution during synthesis and washed with inert solvent. EFFECT: increased yield and improved quality of the resulting product due to more perfect technology. 2 cl, 4 ex