1-(2,4-Dinitrophenyl)-3-oxidopyridinium rearranges spontaneously to the isomeric ether on attempted isolation, but can be trapped with olefins and behaves as a highly reactive 1,3-dipole.
N. Dennis, B. Ibrahim, A. R. Katritzky and Y. Takeuchi, J. Chem. Soc., Chem. Commun., 1973, 292a DOI: 10.1039/C3973000292A
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