The fragmentations of 2-halogenoalkylphosphonic acid dianions have been studied at various pH values and temperatures, and in the presence of added salts. The data obtained, together with the lack of a deuterium solvent isotope effect and the effect of alkyl substitution at the β-carbon atoms, suggest that the reaction involves a transition state resembling a dipolar ion.
M. J. Gregory and G. M. C. Higgins, J. Chem. Soc., Perkin Trans. 2, 1974, 711 DOI: 10.1039/P29740000711
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