For the coupling of aryl halides with aryl Grignards, nickel chloride in tetrahydrofuran (THF) is also a good catalyst. Additionally, an effective catalyst for the couplings of alkyl halides is dilithium tetrachlorocuprate (LiCuCl), prepared by mixing lithium chloride (LiCl) and copper(II) chloride (CuCl) in THF. The Kumada-Corriu coupling gives access to [substituted] styrenes.