The stereochemical course of the exocyclic displacement reaction of a five-ring phosphinate (1-methoxy-3-methylphospholan-1-oxide) has been shown to proceed with inversion of configuration, which rules out a pathway involving a single pseudorotation step and suggests a direct in-line displacement with the ring diequatorial in the pentacoordinate intermediate or transition state.
P. M. Cullis and A. D. Kaye, J. Chem. Soc., Chem. Commun., 1992, 346 DOI: 10.1039/C39920000346
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