P-31 NMR ANALYSIS OF CYCLOTRIPHOSPHAZENES

The relationships of P-31 chemical shift with the degree of the substi tution, the different kind of substituent group, reaction activation e nergy, and electronegativity and of the coupling constant with the deg ree of the substitution were investigated. The P-31 chemical shifts an d the coupling constants correlate linearly with the degree of the sub stitution. The chemical shifts are proportional to the reaction activa tion energy. Observed chemical shifts are expressed and calculated wit h a partial chemical shift of the unit substituent group and electrone gativity. These correlations can be useful for the assignment of the r esonances of other related derivatives.