Conformations of 6-membered-ring phosphorus heterocycles: the 5-t-butyl-2-oxo-1,3,2-dioxaphosphorinans

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Abstract
The cis- and trans-isomers of 2-methoxy-2-oxo-, 2-methoxy-2-thio-, and 2-methyl-2-oxo-5-t-butyl-1,3,2-dioxaphosphorinan are shown to be predominantly chair-form rings with the t-butyl group equatorial in each case.