The method of studying molecular association by the use of Piekara factor (Δε/E2) measurements together with electric permittivity (ε) is applied to the conformational equilibria in the liquid phase of 1,2-dichloroethane and dimethyl carbonate at several temperatures. Dipole moments of the gauche conformer in the first molecule as well as the temperature and solvent dependence of the equilibrium constant are in good agreement with other data. Results on dimethyl carbonate indicate the presence of 3 conformers in the liquid; the equilibria are studied by assuming values for the dipole moments.
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Thiébaut et al. (1976) studied this question.