An ultrasonic relaxation observed in 3- and 4- substituted cyclohexenes is attributed to the perturbation of the conformational equilibrium between the axial and equatorial half-chair forms of the molecules. The barrier to interconversion for the 4-bromo compound is close to that found from a recent n.m.r. experiment.
K. R. Crook and E. Wyn-Jones, Trans. Faraday Soc., 1971, 67, 660 DOI: 10.1039/TF9716700660
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