Journal of Fluorine Chemistry p. 359 - 372 (1987)
Update date:2022-08-31
Topics:
Wrackmeyer, Bernd
Werner, Konrad Von
Wehowsky, Frank
δ(17)O- and δ(13)C values are reported for 15 polyfluorinated carbonyl compounds.If the Rf 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 Rf 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.
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