Contrary to a recent report, the diequatorial conformation makes no appreciable contribution to the title compound. Evidence is presented that the preferred conformation is 3-axial-4-equatorial. The activation parameters or the conformational process in this compound are: ΔH‡ 13.25 ± 0.14 kcal mol–1, ΔS‡+2.8 ± 0.6 cal mol–1 K–1, possibly owing to slowing of a nitrogen inversion process.
F. G. Riddell and A. J. Kidd, J. Chem. Soc., Perkin Trans. 2, 1977, 1816 DOI: 10.1039/P29770001816
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