Palladium-Catalyzed Activator-Free Oxidative Homocoupling of Organosilanes and Organoboranes

摘要

Oxidative homocoupling reactions of organosilanes and organoboranes were found to proceed without any added activators using a catalytic amount of a palladium-1,3-bis(diphenylphosphino)propane complex under an oxygen atmosphere.Palladium-catalyzed cross-coupling of organic halides(pseudohalides)with organometallic compounds has proven to be one of the most powerful and popular carbon-carbon bond forming reactions,widely used for the synthesis of valuable organic compounds such as Pharmaceuticals and functionality materials.Similarly,palladium-catalyzed homocoupling of organometallic compounds,although less familiar,is also a potential method for carbon-carbon bond formation,where symmetrical organic compounds are produced straightforwardly.Although a variety of organometallic compounds have been employed for the coupling reactions,the use of organosilanes or organoboranes would be of great advantage in their higher chemoselectivities and widespread availability.