H and13 C NMR spectra of symmetrically substituted cyclotriphosphazenes exhibit second-order effects. The influence of the 31 P, 31 P coupling constants between ring phosphorus atoms on these effects was studied. Some values of this coupling constant between phosphorus bearing identical substituents were measured using 13 C satellites of the 31 P signals or by introduction of a chiral substituent on the third phosphorus atom.
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