Cross-Coupling Reaction of Aryl Halides with Grignard Reagents Catalyzed by Nickel Complexes Supported 2-pyrazolinyl-9-aryl-1, 10-phenanthrolines

Four nickel complexes[NiCl2L](1-4) supported by a tridentate pyrazolyl-based phenanthroline ligand (L1-L4) have been developed for C-C coupling reactions. The nickel complexes exhibited moderate catalytic activities for C-C coupling reactions of various aryl halides with Grignard reagent. Single-crystal X-ray diffraction analysis of the complex[NiCl2L4](4) reveal a distorted trigonal bipyramidal geometry at the Ni(Ⅱ) center, which creates a reaction channel to facilitate C-C coupling reactions.