A conformational steric isotope effect for carbon in a methyl group in cis-1,4-dimethylcyclohexane has been measured as +1.24 ± 0.25 J mol–1 in acetone and +1.25 ± 0.20 J mol –1 in benzene (both at 300 K), i.e., inverse, with 12C preferring to be axial, and smaller in magnitude than estimates from force field calculations.
S. L. R. Ellison, M. S. Fellows, M. J. T. Robinson and M. J. Widgery, J. Chem. Soc., Chem. Commun., 1984, 1069 DOI: 10.1039/C39840001069
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