Pyridazines with Heteroatom Substituents in Position 3 and 5, Part 1: 5-Hydroxy-3(2H)-pyridazinone and Its Derivatives

Article abstract of DOI:10.1007/BF00811746

The synthesis of the title compound 7 was achieved starting with mucochloric acid via the pyridazinones 1,2 and 6.The electrolytic ionisation constants for 7 were found to be 4.81 (+/-0.03) and -0.3 (+/-0.3).Crystal structure analyses were performed for 7 and its "fixed" derivatives 6 and 9. - Keywords.Synthesis of 5-methoxy- and 5-hydroxy-3(2H)-pyridazinones; pK_a Values of 5-hydroxy-3(2H)-pyridazinone; Crystal structure of 3(2H)-pyridazinones.