A. Katritzky, I. Pojarlieff
1968
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Abstract
4-Aminopyridazine exchanges in acid solution as the conjugate acid at the 5-position. In the low acidity region, the conjugate acid exchanges by the ylid mechanism at the 3- and 6-positions. Pyridazin-4-one exchanges by the acid-catalysed mechanism as the neutral species at the 5-position; ylid-mechanism exchange on the conjugate acid occurs at the 3- and 6-positions. Pyridazin-3-one exchanges in acid solution at the 5-position; the mechanism probably involves a hydrated species. Rate constants are measured and discussed.