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Benzazoles: IV. Reaction of 1,3-Dihydro-2H-benzimidazol-2-ones with Chlorosulfonic Acid

  • 期刊论文

  • 发表日期：

    2024年9月1日

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  • Yu. R. Takhirov,
  • D. A. Dushamov,
  • R. Sh. Kuryazov,
  • R. M. Usmonov

摘要

Abstract

1,3-Dihydro-2H-benzimidazol-2-ones reacted with chlorosulfonic acid at 50–60°C to give 5-chloro­sulfonyl-1,3-dihydro-2H-benzimidazol-2-ones regardless of the reactant ratio (1:1 to 1:5). 5-Chloro-1,3-dihy­dro-2H-benzimidazol-2-ones failed to react with chlorosulfonic acid at 50–60°C, and the corresponding 5-chloro-6-chlorosulfonyl derivatives were obtained at 110–120°C.