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Significance: A very simple and convenient method for preparation of symmetrical biaryls and bis-heteroaryls from corresponding aryland hetaryl halides. Various functionalized Grignard reagents can be used in the reaction. The intramolecular variant allows synthesizing interesting polycyclic systems. Comment: The preparation of functionalized arylmagnesium compounds can be readily performed by using a halogen-magnesium exchange reaction (see, for example: A. Krasovskiy, P. Knochel Angew. Chem. Int. Ed. 2004, 43, 3333-3336) and references cited therein). There was still a need for a simple, cheap and reliable method for the homocoupling of the highly functionalized aryl Grignard reagents. Use of FeCl3 as a catalyst makes it also environmentally friendly and convenient for large scale synthesis. I MgCl

Iron-Catalyzed Homo-Coupling of Arylmagnesium Reagents