| Abstract: | 1-Acetyl-5-hydroxyl-2-isopropyl(phenyl)pyrazolidines, as well as 1-hydroxyperhydropyrazolo[1,2-a]-4H-pyridazine-5,8-dione, react readily with alkyl-, aryl-, and acylhydrazines and hydroxylamine to give the corresponding products of substitution of the OH group, which, depending on the nature of the hydrazine, exist in the linear  -hydrazidohydrazone (oxime) form or in the form of a cyclic tautomer, viz., the corresponding 1-acetyl-5-hydrazinopyrazolidine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1238–1241, September, 1985. |
