The observation of a doublet methyl signal in the 13C n.m.r. spectrum of NN-dimethylformamide from 0–100% H2SO4 demonstrates that the predominant protonated form at all acidities is the O-protonated amide.
R. A. McClelland and W. F. Reynolds, J. Chem. Soc., Chem. Commun., 1974, 824 DOI: 10.1039/C39740000824
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