One-bond carbon-nitrogen coupling constants in amides vary over a narrow range, while two-bond couplings show a much more pronounced structural dependence; no three-bond values are observed.
R. L. Lichter, C. G. Fehder, P. H. Patton, J. Combes and D. E. Dorman, J. Chem. Soc., Chem. Commun., 1974, 114 DOI: 10.1039/C39740000114
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