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Polysulfide Anions as Visible Light Photoredox Catalysts for Aryl Cross-Couplings
preprintsubmitted on 13.10.2020, 08:25 and posted on 13.10.2020, 13:17 by Haoyu Li, Xinxin Tang, Jia Hao Pang, Xiangyang Wu, Edwin K. L. Yeow, Jie Wu, Shunsuke Chiba
Herein, we disclose the use of polysulfide anions as visible light photoredox catalysts for aryl cross-coupling reactions. The reaction design enables single-electron-reduction of aryl halides upon photo-excitation of tetrasulfide dianions (S42–). The resulting aryl radicals are engaged in (hetero)biaryl cross-coupling, borylation, and hydrogenation in a redox catalytic regime involving S4•–/S42– and S3•–/S32– redox couples.