Molecular acoustics. Part 6.—Ring inversion in some cyclohexenes

Abstract

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.