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Copper/palladium‐catalyzed multicomponent cyclization reactions, which combine 2‐gem‐dibromovinyl aryl selenides with a nucleophilic source, were applied to the synthesis of 2‐substituted benzo[b]selenophenes. A systematic study of the cyclization system revealed that the mutual action between copper and palladium salts is essential for the formation of products in good yields, avoiding the formation...
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