ISSN:
0030-4921
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The NMR spectral parameters for some bromo- and iodo-substituted fluorobenzenes are presented, and the derived meta- and para- fluorine-fluorine couplings are shown to be in accord with the predictions made by Abraham et al., using an additive substituent constant scheme. While the approximation of additive substituent effects is quite good, it is shown, however, that with highly accurate experimental values there are small deviations from perfect additivity. The existence of a large solvent effect on 3JFF is demonstrated and the mechanism of this effect is discussed. It is emphasized that certain discrepancies in the literature between various values of the same 3JFF may be due to this large, hitherto unrecognized solvent dependence.
Additional Material:
4 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1270010504
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