H-1 and P-31 NMR spectroscopies were used to study 21 compounds of O,O-dialkyl-alpha-(2-benzoxazolyl)oxyacetoxyalkyl-phosphonate. It is indicated that the non-equivalence between the two ester OR' groups is affected by the alpha-substituentes. The larger the substituent is, the greater the difference of H-1 chemical shifts between the two ester OCH3 groups is. The alpha and ester substituents also affected alpha-magnetic nuclei, that is alpha-H and alpha-P-31. The regular dependences of their chemical shifts, as well as their scal...
