The temperature-dependent n.m.r. spectra of a number of annulenes and dehydro-annulenes have been correlated. By use of the observed values of Δν and the temperature of coalescence, Tc, an estimate for the free-energy barrier for interconversion of internal and external protons has been made.
I. C. Calder and P. J. Garratt, J. Chem. Soc. B, 1967, 660 DOI: 10.1039/J29670000660
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