Carbon‐13 and phosphorus‐31 NMR spectroscopy of phenoxychlorocyclotriphosphazenes, N 3 P 3 Cl 6‐ n (OC 6 H 5 ) n

The 31 P and 13 C NMR spectra of all twelve phenoxychlorocyclotriphosphazenes of general formula N 3 P 3 Cl 6‐ n (OC 6 H 5 ) n ( n = 1‐6) were assigned in detail. With samples abundant in one homolog, but with a disparity between geometrical isomers, the signals due to the cis and trans isomers of N 3 P 3 Cl 4 (OC 6 H 5 ) 2 and N 3 P 3 Cl 2 (OC 6 H 5 ) 4 were also assigned. The 31 P chemical shifts and coupling constants correlate linearly with the level of substitution, n . The 13 C NMR spectra exhibit complex multiplets for the ipso ‐ and ortho ‐carbons. It is shown that each of these is the X part of one of the spin systems XAM 2 , XAA′M, XAA 2 ′, XAB 2 and XAA′B. The 13 C chemical shifts of the ipso ‐ and para ‐carbons also exhibit correlations with n. The 13 C‐ 31 P coupling constants, both 2 J (POC) and 3 J (POCC), are larger for the PCl(OC 6 H 5 ) than for the P(OC 6 H 5 ) 2 moieties.