Cu-catalyzed Reductive Coupling of Perfluoroarenes with 1,3-Dienes

Copper complexes, generated by the treatment of CuCl2 with EtMgCl, catalyze a reductive coupling reaction of perfluoroarenes with 1,3-dienes via C–F bond cleavage, in which the internal carbon of 1,3-dienes preferably reacts with perfluoroarenes giving rise to branched allylated perfluoroarenes as a major coupling product.