A. S. Fokin, Ya. V. Burgart, V. I. Saloutin, O. N. Chupakhin, “Unexpected formation of pyridazine-5,6-dione derivatives in the reactions of 3-arylhydrazono-2,4-dioxo-4-pentafluorophenylbutanoates with hydrazines”, Mendeleev Commun., 15:6 (2005), 252

Abstract: The reactions of 3-arylhydrazono-2,4-dioxo-4-pentafluorophenylbutanoates with hydrazine hydrate and phenylhydrazine resulted in the formation of 4-arylazo-3-pentafluorophenyl-1,2-dihydro-5H,6H-pyridazine-5,6-diones or 6-aryl-2-phenyl-7,8,9,10-tetrafluoro-2,3,4,6-tetrahydropyridazino[4,3-c]cinnoline-3,4-dione.

This publication is cited in the following 4 articles:

Pardis Hafez Taghva, Hassan Kabirifard, “Ring-chain transformation of 4-aroyl-5-phenylamino-2,3-dihydrothiophene-2,3-diones: Facile and efficient synthesis of novel pyrrolo[2,3-c]pyrazol-3(2H)-ones and 1,2-dihydro-5H,6H-pyridazine-5,6-diones”, Journal of Sulfur Chemistry, 41:2 (2020), 200
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Andrei S. Fokin, Yanina V. Burgart, Viktor I. Saloutin, Oleg N. Chupakhin, “Unexpected Formation of Pyridazine‐5,6‐dione Derivatives in the Reactions of 3‐Arylhydrazono‐2,4‐dioxo‐4‐pentafluorophenylbutanoates with Hydrazines.”, ChemInform, 37:15 (2006)