The magnetic resonance spectra of fluorine nuclei in some tetrafluorinated pyridines are described, and the values of the shift produced by a substituent in pyridines compared with that produced by the same substituent in benzenes. For the substituents F, Cl, and OH the values of the para-substituent shift is compared with π-electron densities, calculated by a SCF–MO method.
J. W. Emsley and L. Phillips, J. Chem. Soc. B, 1969, 434 DOI: 10.1039/J29690000434
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