Comparison between the structures of the two copper(II) complexes of 1,4,8,11-tetraaza-5-oxocyclotetradecane with a deprotonated and protonated amide group shows that the carbonyl oxygen is the protonation site and enables discussion of the detailed mechanism of acid dissociation.
L. Siegfried, M. Neuburger, M. Zehnder and T. A. Kaden, J. Chem. Soc., Chem. Commun., 1994, 951 DOI: 10.1039/C39940000951
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