(17)O AND (13)C NUCLEAR MAGNETIC RESONANCE STUDY OF POLYFLUORINATED CARBONYL COMPOUNDS

Article abstract of DOI:10.1016/S0022-1139(00)85018-6

δ(17)O- and δ(13)C values are reported for 15 polyfluorinated carbonyl compounds.If the R_f group is separated from the carbonyl group by less than two carbon atoms a marked increase in the nuclear shielding of (13)C(C=O) and a marked decrease in the nuclear shielding of the (17)O(C=O) nucleus is observed.This is ascribed to the differing effects of the R_f group on the ? and the ? system of the carbonyl unit.The effect on the ?-manifold leads to increase in shielding but it may be offset (as in the case of the (17)O nucleus) by destabilization of the ? system.UV spectroscopic data for some polyfluorinated carbonyl compounds support these arguments.