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The pyrrolyl substituent enhances the electron densities on the pyridazine ring and has the effect of shifting the positions of the tautomeric equilibria for 1c,d 2c,d, which exist predominantly as the pyridazin-3-one and -3-thione forms, towards the hydroxyl (thiol) structures, compared with those of those for the parent unsubstituted systems.

The tautomeric properties of 6-(2-pyrrolyl)pyridazin-3-one and 6-(2-pyrrolyl)pyridazin-3-thione