Triflic Salt-Catalyzed Coupling: Iron Triflate-Catalyzed Homocoupling of Aryl Bromides in the Presence of Metallic Magnesium

In the presence of metallic magnesium, the homocoupling reaction of aryl bromides catalyzed by iron triflate was carried out readily in one pot. The catalyst was used successfully in this coupling reaction without preparation of Grignard reagent in advance. Meanwhile, the catalyst was recovered easily and reused smoothly with only a little loss of its activity.