Nitration of 1,2,2,3-tetrasubstituted 5-triphenylmethylbenzimidazolines using an Ag+/NO2- system shows an unexpected (for benzimidazolines) orientation of the nitro group into position 7, which may be due to the strong steric influence of the rather bulky triphenylmethyl substituent.
A. S. Morkovnik, Mendeleev Commun., 1997, 7, 175 DOI: 10.1070/MC1997v007n05ABEH000817
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