A maximum kinetic deuterium isotope effect, corresponding to ΔEa, the difference in zero point C–D and C–H vibrational energies and Δ(ΔS‡)= 0, determined for both t-butyl and ethyl ester thermolysis, is interpreted as evidence supporting only a symmetrical, non-heterolytic, transition state which is non-planar and analogous to that of other pericyclic fragmentations.
H. Kwart and J. Slutsky, J. Chem. Soc., Chem. Commun., 1972, 1182 DOI: 10.1039/C39720001182
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