A general theory of the structure and reactivity of those heterocyclic betaines which are isoelectronic with odd alternant hydrocarbon anions is described; two distinct types of dipolar heterocycles are recognised and a rule for predicting novel systems which may be reactive 1,3-dipoles is presented.
C. A. Ramsden, J. Chem. Soc., Chem. Commun., 1977, 109 DOI: 10.1039/C39770000109
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