Proton magnetic resonance is used to study the tautomeric equilibria of a number of methyl-substituted benzofuroxans and pyrido[2,3-c]furoxans. Large influences (ca. 0·5–1 kcal./mole) are exerted by methyl and aza-substituents adjacent to the heterocyclic ring. The effect of a 5(6)-methyl group is small.
A. J. Boulton, P. J. Halls and A. R. Katritzky, J. Chem. Soc. B, 1970, 636 DOI: 10.1039/J29700000636
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