Reactions of 3-Arylhydrazono-2,4-dioxobutanoates with Hydrazine Hydrate

摘要

4-Substituted 3-arylhydrazono-2,4-dioxobutanoates acids esters undergo cyclization under the action of hydrazine hydrate to form 4-arylazo-3-pyrazolecarboxylic acids derivatives. The structure of the compounds obtained was determined from spectral methods.