《Pd-catalyzed amidation of 1,3-diketones with CO and azides via a nitrene intermediate》 was published in Chemical Communications (Cambridge, United Kingdom) in 2020. These research results belong to Gu, Zheng-Yang; Chen, Jie; Xia, Ji-Bao. Computed Properties of C4H3ClO2S2 The article mentions the following:
An efficient Pd-catalyzed amidation of 1,3-diketones has been developed using carbon monoxide and organic azides. This reaction provides a step-economic approach to produce β-ketoamides from readily available compounds under mild ligand-, oxidant-, and base-free conditions. The mechanistic studies showed that the reaction occurred through an in situ generated isocyanate intermediate. The experimental part of the paper was very detailed, including the reaction process of Thiophene-2-sulfonyl chloride(cas: 16629-19-9Computed Properties of C4H3ClO2S2)
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. Computed Properties of C4H3ClO2S2
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics