2-Halogenobenzimidazoles react with thiophenol as well as with benzenethiolate ion. The reaction also occurs in acidic medium. The effect on the reaction of structural modifications in the benzimidazole and in the thiophenol have been investigated. The general kinetic equation Rate =k1[B][ArS–]+k2[BH+][ArSH]+k3[BH+][ArS–] is proposed to explain the overall reaction.
A. Ricci and P. Vivarelli, J. Chem. Soc. B, 1968, 1280 DOI: 10.1039/J29680001280
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