Cyclic oxyphosphoranes with six- and seven-membered rings

Kumara Swamy, K. C. ; Burton, Sarah D. ; Holmes, Joan M. ; Day, Robehta O. ; Holmes, Robert R. (1990) Cyclic oxyphosphoranes with six- and seven-membered rings Phosphorus, Sulfur, and Silicon and the Related Elements, 49 (1). pp. 367-372. ISSN 1042-6507

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X-ray and variable temperature NMR investigations of cyclic pentaaxyphosphoranes reveal a preference of six- and seven-membered rings for apical-equatorlal orientations of trigonal bipyramids. Saturated six-membered rings prefer a boat conformation. Apical-equatorial ring pseudorotations are more facile for five-membered rings, whereas ligand exchange via diequatorial ring placement is more facile for the larger rings. Application to enzymatic reactions of cyclic AMP is emphasized.

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