Ultraviolet absorption of benzamide in conc. sulphuric acid undergoes changes due to a shift of the tautomeric equilibrium of amide cations from N-protonated in 60% acid to O-protonated in 100% acid.
M. Liler, J. Chem. Soc., Chem. Commun., 1972, 527b DOI: 10.1039/C3972000527B
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