The protonation of pyridine 1-oxides of low basicity in aqueous sulphuric acid solutions is correlated by the amide acidity function rather than the Hammett acidity function. The HA-scale has been extended by measurements of the second protonation of phenazine 5,10-dioxide.
C. D. Johnson, A. R. Katritzky and N. Shakir, J. Chem. Soc. B, 1967, 1235 DOI: 10.1039/J29670001235
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