1,2-Polymethylenebenzimidazole N-oxides undergo substitution in the benzene ring by the combined action of an acid chloride and various nucleophiles (e.g. Cl, CN, SCN, and N3) and rearrange to 1,3-polymethylenebenzimidazolones with tosyl chloride and sodium hydroxide or by photolysis of the N-oxide in methanol.
R. Fielden, O. Meth-Cohn and H. Suschitzky, J. Chem. Soc. D, 1970, 1658 DOI: 10.1039/C29700001658
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