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The [Cu(OTf)]<jats:sub>2<\/jats:sub>\u22c5benzene catalyst that has been standard in this reaction for many decades, however, is air\u2010sensitive, prone to photodecomposition, and poorly reactive towards sterically bulky alkene substrates. Using bench\u2010stable precursors, an improved catalyst system with superior reactivity and photostability has been designed, and it offers significantly expanded substrate scope. 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