On The Preparation And Pseudorotation Of Certain Monocyclic Pentaoxyphosphoranes

Abstract
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.