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A series of substituted N-(2´,5´-dihydroxyphenyl)pyridinium salts which are able to form mesomeric betaines have been prepared starting from p-benzoquinone. Depending on the substitution pattern these compounds form conjugated, cross-conjugated, or pseudo-crossconjugated tautomers.

Conjugated, cross-conjugated, and pseudo-cross-conjugated derivatives of a pyridinium alkaloid from Punica granatum