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The proton‐coupled 13 C NMR spectra of 2‐, 3‐ and 4‐fluoropyridines were completely analysed and the signs and magnitudes of the 13 C‐ 1 H coupling constants determined. The root mean square deviations of the observed J (CH) values from those calculated using empirical correlations between the coupling constants in monosubstituted pyridines and benzenes were found to be 0.90 Hz for 1 J (CH) and less than 0.26 Hz for the other n J (CH) couplings.
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Denisov et al. (1985) studied this question.
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