1-(2,4-Dinitrophenyl)-3-oxidopyridinium rearranges easily to 3-(2,4-dinitrophenoxy)pyridine. The betaine forms adducts with dipolarophiles by addition across the 2- and 6-positions.
N. Dennis, B. Ibrahim, A. R. Katritzky, I. G. Taulov and Y. Takeuchi, J. Chem. Soc., Perkin Trans. 1, 1974, 1883 DOI: 10.1039/P19740001883
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