Abstract
The relationship between 15N, 17O, 31P, 77Se NMR spectral parameters and the electronic structure of a number of polyfluoroaromatic compounds has been discussed. Increase in nuclear shielding has been found in polyfluoroaromatic compounds investigated with respect to their hydrocarbon analogues. That effect has been discussed in terms of a decreased conjugation between the unshared electron pair of the heteroatom and the π-system of the polyfluorinated benzene ring. The influence of a polyfluoroaryl group on the character of bonds between different atoms in the functional group has been discussed on the basis of 17O and 15N ( 31P, 13C) NMR data for the aromatic compounds containing the MO double bonds (M C, N, P). Pentafluorophenyl group has been found to shield nitrogen and deshield oxygen as compared to the phenyl one. This has been observed by other spectral methods.
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