A carbon‐13 NMR study of phenyl‐substituted cyclophosphazenes

Abstract

The -C N M R spectra of the cydotriphosphazenes N3pJcJ6-n Ph. (n= 2,3,4,6) and the telramenc derivatives 2 , 2 , 6 , 6 N . & ' 4 m and N a 4 P k have been recorded. The carbon chemicsl shifts can be largely explained on the basis of concomitant mesomeric electron release from the benzene ring and inductive electron withdrawal by phosphorus. The magnitude of 'J(P, C-1) for the non-geminal compounds is -40 Hz higher than that observed for the geminal compounds. Some aspects of the NMR data are also discussed with reference to the X-ray a y s t a l structures of several phenyl-substituted cydotri-and cydotetra-phosphazenes.

Organophosphazenes. 19. Copolymerization of 2-(α-ethoxyvinyl)pentafluorocyclotriphosphazene with styrene and methyl methacrylate

“…6 The approximate nature of the Q, e data does not prohibit small amounts of mesomeric interactions occuring In I such as has been claimed in other organophosphazenes. 7 " 18 The e value for I is quite different from those typically found for vinylethers and this difference may be ascribed to the reduction of the electron rich nature of the vinylether by the strong a.7.…”