1,3-Dipolar character of six-membered aromatic rings. Part 52. 2+ 8 Cycloaddition reactions of 1-substituted 3-oxidopyridinium betaines
Alan R. Katritzky, Alan T. Cutler, Nicholas Dennis, Gebran J. Sabongi, Soheila Rahimi-Rastgoo, Gerhard W. Fischer and Ian J. Fletcher
J. Chem. Soc., Perkin Trans. 1, 1980, p.1176
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http://dx.doi.org/10.1039/P19800001176