6-Nitrobenzimidazole 1-oxides are formed from N-2,4-dinitrophenylamino-acids in optimum yields at very low pH and also at ca. pH 3. The reaction at pH 3 requires a hydrogen atom on the amino-group, whereas at low pH it does not. The mechanism of the reaction is discussed.
D. J. Neadle and R. J. Pollitt, J. Chem. Soc. C, 1969, 2127 DOI: 10.1039/J39690002127
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