The S-bridged pentaoxyphosphorane 2a has been prpared for the first time and its ground-state structure studied on the time scale of NMR (1H, 19F, 31P, and 13C) spectroscopic measurements. Compound 2a was found to show significant barriers to intramolecular ligand rearrangement (pseudorotation). A comparative study on non-bridged pentaoxyphosphoranes of type 14 was also undertaken.
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Abdou et al. (1986) studied this question.
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