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An ambient-light-promoted stereospecific olefinic C(sp2)–S bond construction of thioacids and 1,1-diarylethenes has been demonstrated, affording various (Z)-vinyl thioesters in 51–85% yields under solvent- and catalyst-free conditions. Mechanistic studies indicated that the formation of thioacid–olefin complexes is responsible for generating a carbonyl thiyl radical and dioxygen in the air participates in the reaction and functions as a traceless reagent. Moreover, synthetic applications have been demonstrated by the gram scale synthesis and aggregation-induced emission property of representative compound 3i.
Wang et al. (Mon,) studied this question.