Fluorine couplings

Emsicy, J W Phillips L, Wray V Fluorine Coupling Constants Pergamon Press Oxford, U K New York 674... 

J. W. Emsley, L. Phillips, and V. Wray, Fluorine Coupling Constants, Prog. NMR Spec-trosc., 10 (1976) 83-756. 

Note also that fluorine couplings to protons in heterocyclic systems can be well outside intuitive expectations See Section 6.5.2 for an example ... 

This point is well illustrated with a spectrum of 3-fluoro propanol (Spectrum 6.10), which shows a fairly dramatic example of fluorine coupling. The F-CH2- coupling is about 47 Hz, and the F-CH2-CH2- coupling, is 27 Hz. The coupling to the third methylene group is non-existent in this example but can be seen sometimes (0-3 Hz). 

Gillespie, R. J., Hartman, J. S., Parekh, M. Solvent Effects on the Boron-Fluorine Coupling Constant and on Fluorine Exchange in Tetrafluoroborate Anion. Can. J. Chem. 46, 1601 (1968). 

Cooper, M. A. NMR Spectra of Some Iodo- and Bromofluorobenzenes. Novel Solvent Effect on Ortho Fluorine-Fluorine Couplings. Org. Mag. Res. 1969, 363. 

On the Usage of Locally Dense Basis Sets in the Calculation of NMR Indirect Nuclear Spin-Spin Coupling Constants Vicinal Fluorine-Fluorine Couplings... 

The symbols I, h refer to proton-fluorine couplings with increasing number of the corresponding fluorine atom. SF values were taken from Refs. 164 and 165 although no standard was reported, CtF6 had obviously been used. 

The symbols I, h refer to proton-fluorine couplings with increasing number of the corresponding fluorine atom. 

Other hand, fluorine coupling constants are very large and, if this element is present, its coupling can be very useful in interpreting spectra and determining structural relationships including those via nonbonded interactions. ... 

Some typical one-bond phosphorus-fluorine couplings... 

Some typical values of ortho-fluorine coupling constants... 

Finally, some typical phosphorus-proton or fluorine couplings through phosphorus or heteroatoms will be discussed. 

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