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Bordwell, F.G.; Singer, D.L.; Satish, A.V., Effects of Structural Changes on Acidities and Homolytic Bond Dissociation Energies of the N-H Bonds in Pyridones and Related Heterocycles, J. Am. Chem. Soc., 1993, 115, 9, 3543, https://doi.org/10.1021/ja00062a019 . [all data]