化学
多硫化物
芳基
氧化还原
光化学
催化作用
芳基
电化学
卤化物
光激发
光催化
可见光谱
组合化学
无机化学
有机化学
电解质
光催化
物理
物理化学
电极
激发态
核物理学
光电子学
烷基
作者
Haoyu Li,Xinxin Tang,Jia Pang,Xiangyang Wu,Edwin K. L. Yeow,Jie Wu,Shunsuke Chiba
摘要
Polysulfide anions are endowed with unique redox properties, attracting considerable attentions for their applications in alkali metals–sulfur batteries. However, the employment of these anionic species in redox catalysis for small molecule synthesis remains underdeveloped due to their moderate–poor electrochemical potential in the ground state, whereas some of them are characterized by photoabsorptions in visible spectral regions. 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 the photoexcitation 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.
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