Frontier M.O. theory rationalises the effects of aza-substitution on the dimerisation tendency in 3-oxidopyridiniums, the 1-(2-pyrimidinyl) betaine displaying the predicted high reactivity; fulvenes add as 6 π-electron systems across the 2,6-positions of 3-oxido-pyridiniums.
N. Dennis, B. Ibrahim and A. R. Katritzky, J. Chem. Soc., Chem. Commun., 1975, 425 DOI: 10.1039/C39750000425
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