13C splittings of proton and fluorine resonance spectra

Mohanty, S. ; Venkateswarlu, Putcha (1967) 13C splittings of proton and fluorine resonance spectra Molecular Physics, 12 (3). pp. 277-281. ISSN 0026-8976

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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0026897...

Related URL: http://dx.doi.org/10.1080/00268976700100351


13C satellites in proton and fluorine N.M.R. spectra have been used to obtain the coupling constants J 13c-h and J 13c-f for a number of ortho-, meta- and para-substituted fluorobenzenes. These coupling constants are found to depend on the substituent as well as the position of substitution. The 13C-H coupling constants, for a particular position, in general, increase with increase of the electron withdrawing power (expressed through Hammett σ-parameters) of the substituents. For a particular substituent, the values of 13C-H coupling constants increase with decrease of σ values and are found to change with the position of the substitution in the order meta < ortho < para. Such regularities are not found for 13C-F coupling constants.

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