Results of 1H n.m.r. analyses indicate that the free-energy difference between certain chair and boat conformations of the cis-2,5-di-t-butyl-1,3,2-dioxaphosphorinan-2-one ring system is unusually low, perhaps 1 kcal/mol or less.
W. G. Bentrude and K. C. Yee, J. Chem. Soc., Chem. Commun., 1972, 169b DOI: 10.1039/C3972000169B
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