Studies on Pyridazines. XI. Reactivity of 3-Hydroxypyridazine 1-Oxides. (3). Nuclear Magnetic Resonance Studies of 3-Hydroxypyridazine 1-Oxide and Its Derivatives

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NMR spectra of 3-hydroxypyridazine 1-oxides and their monomethylated derivatives were examined and structural propriety of their nitrated and halogenated products was confirmed by the analyses of the NMR spectra. Furthermore, in 3-hydroxypyridazine 1-oxides, predominance of enol form tautomer was proved by NMR data. The conclusion was also drawn by other spectral data (UV and IR).