Gas phase Fourier transform i.r. and solution 500 MHz 1H n.m.r. measurements show that deuterium prefers the equatorial over the axial site in N,N′,5,5-tetramethylhexahydro[2-2H1]pyrimidine by 420 J mol–1, but exhibits no preference in the case of 5,5-dimethyl[2-2H1]-1,3-dithiane.
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Anet et al. (1987) studied this question.