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A carbon‐13 NMR study of phenyl‐substituted cyclophosphazenes
Author(s) -
Krishnamurthy S. S.,
Ramabrahmam P.,
Woods M.
Publication year - 1981
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270150217
Subject(s) - geminal , benzene , chemistry , ring (chemistry) , chemical shift , carbon 13 nmr , stereochemistry , crystallography , nmr spectra database , medicinal chemistry , organic chemistry , spectral line , physics , astronomy
The 13 C NMR spectra of the cyclotriphosphazenes N 3 P 3 CI 6−n Ph n (n=2, 3, 4, 6) and the tetrameric derivatives 2,2,6,6‐N 4 P 4 CI 4 Ph 4 and N 4 P 4 Ph 8 have been recorded. The carbon chemical 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 1 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 crystal structures of several phenyl‐substituted cyclotri‐ and cyclotetra‐phosphazenes.