《Visible-Light-Driven Remote C-H Chlorination of Aliphatic Sulfonamides with Sodium Hypochlorite》 was published in Asian Journal of Organic Chemistry in 2020. These research results belong to Zhu, Yanshuo; Wang, Juan-Juan; Wu, Danhua; Yu, Wei. Reference of Thiophene-2-sulfonyl chloride The article mentions the following:
The C(sp3)-H chlorination of aliphatic sulfonamides was realized by visible-light photoredox catalysis with Ru(bpy)3Cl2 as photocatalsyt and NaOCl·5H2O crystals as the chlorinating agent. The reaction proceeded in a tandem pattern of N-H chlorination and Hofmann-Loffler-Freytag chlorination. A variety of differently substituted sulfonamides were chlorinated in this way in high yield. A radical-chain mechanism was proposed for the reaction on the basis of exptl. evidence. After reading the article, we found that the author used Thiophene-2-sulfonyl chloride(cas: 16629-19-9Reference of Thiophene-2-sulfonyl chloride)
Thiophene-2-sulfonyl chloride(cas: 16629-19-9) is a member of sulfonyl chlorides. Sulfonyl chlorides are reactive sulfonic acid derivatives similar in properties and reactivity to acid chlorides of carboxylates. The sulfonic acid group, however, is a highly hindered molecule, containing a tetrahedral configuration of substituents. Reference of Thiophene-2-sulfonyl chloride
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics