Ab-initio calculations of P-31 NMR chemical shifts of substituted aryl dialkyl phosphates

The experimental values of P-31 NMR chemical shifts of dialkyl aryl phospha tes were compared to the ab-inito calculated values. The consistence of the model that states the delta P-31 NMR chemical shift of phosphoric acid der ivatives is mainly governed by symmetry of the electron cloud on the phosph orus atom that would, in turn, be related to the electronegativity of the s ubstituent and the model suggesting the effect of "back bonding" from phosp horyl oxygen to phosphorus atom were both confirmed.