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Communication | Regular issue | Vol 12, No. 4, 1979, pp.457-460
Published online, 1st January, 1970
DOI: 10.3987/R-1979-04-0457
Ring Contraction of 4-Diazo-1-phenyl-5,6-dioxo-1,4,5,6-tetrahydropyridazine in the Solid Stave via “Pyrazolo-lactone

Branko Stanovnik,* Miha Tisler, Jernej Bradac, Bojan Budic, Bozidar Koren and Bojana Mozetic-Rescic

*Department of Chemistry, University of Ljubljana, 61000 Ljubljana, Slovakia

Abstract

Conversion of 4-diazo-1-phenyl-5,6-dioxo-1,4,5,6-tetrahydropyridazine into “pyrazolo-lactone”, from which different 5-hydroxy-1-phenyl-pyrazoles can be formed in the solid state, is described.