Rr. Holmes et Tk. Prakasha, CYCLIC OXYPHOSPHORANES - P-31 CHEMICAL-SHIFT CORRELATIONS, Phosphorus, sulfur and silicon and the related elements, 80(1-4), 1993, pp. 1-22
Recent X-ray structures and solution NMR behavior of cyclic oxyphospho
ranes are reviewed followed by a presentation of P-31 NMR chemical shi
ft data for monocyclic and bicyclic oxyphosphoranes with rings varying
from six- to eight-membered. Effects caused by the presence of the nu
mber of rings, the ring size, the variation in ring hetero atoms, and
the electronegativity of attached nonring substituents, are correlated
with structural and bonding features, particularly with changes in P-
O pi bonding. The formation of hexacoordinated phosphorus brought abou
t by the introduction of sulfur into ring arrangements is deemed to be
a potentially important consideration for enzyme-phosphate action at
active sites where sulfur residues may be present.