sentences:  The first investigations into the catalytic coupling of Grignard reagents with organic halides date back to the 1941 study of cobalt catalysts by Karasch and Fields.In 1971, Tamura and Kochi elaborated on this work in a series of publications demonstrating the viability of catalysts based on silver, copper and iron.However, these early approaches produced poor yields due to substantial formation of homocoupling products, where two identical species are coupled.