Reactions of 4-alkylidene(arylidene)-1-phenylpyrazolidine-3,5-dione with oxidizing (chromium trioxide/acetic acid) as well as with reducing (sodium borohydride/methanol) agents were carried out. Phenylhydrazine reacted with 4-arylidene-1-phenylpyrazolidine-3,5-diones via fission of exo C=C bond to give 1-phenylpyrazolidine-3,5-dione and the corresponding aryl hydrazones.Condensation of 1-phenyl-3,5-pyrazolidinedione (1) with carbonyl compounds readily give 4-alkylidene(arylidene)-1-phenyl-3,5-pyrazolidinediones 2 which were subjected to several investigations [1][2][3][4]. The purpose of this paper is to develop and study new products derived from 2 by oxidation, reduction, and reaction with phenylhydrazine.

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