Trinuclear copper(I) complex of 1,3-bis(2-pyridinylmethyl)imidazolylidene as a carbene-transfer reagent for the preparation of catalytically active nickel(II) and palladium(II) complexes |
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| Institution: | 1. Department of Chemistry, Zhejiang University, Xixi Campus, Hangzhou 310028, PR China;2. College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, PR China;1. Department of Chemistry, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4M1, Canada;2. McMaster Analytical X-Ray Diffraction Facility, 1280 Main Street West, Hamilton, Ontario, L8S 4M1, Canada |
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| Abstract: | Reactions of 1,3-bis(pyridin-2-ylmethyl)-1H-imidazol-3-ium hexafluorophosphate, (HL1](PF6), L1 = 1,3-bis(pyridin-2-ylmethyl)imidazolylidene) and 1,3-bis(pyridin-2-ylmethyl)-1H-benzimidazol-3-ium hexafluorophosphate (HL2](PF6), L2 = 1,3-bis(pyridin-2-ylmethyl)benzoimidazolylidene) with cuprous oxide in acetonitrile readily yielded trinuclear complexes Cu3(L1)3(PF6)3] (1) and Cu3(L2)3(PF6)3] (2). Treatment of 1 with Ni(PPh3)2Cl2 and Pd(cod)Cl2 gave Ni(L1)Cl](PF6) (3) and Pd(L1)Cl](PF6) (4), respectively, due to transmetalation. Ni(L1)2](PF6)2 (5) was obtained from the reaction of Cu3(L1)3(PF6)3] and Raney nickel in acetonitrile. All these complexes have been fully characterized. Both 1 and 2 consist of a triangular Cu3 core with each Cu–Cu bond capped by an imidazolylidene group. Each imidazolylidene acts as a bridging ligand in a μ2 mode and is bonded equally to two Cu(I) ions. The pincer nickel and palladium complexes are square-planar and contain a tridentate NCN ligand. Complexes 3 and 4 are efficient catalyst precursors for Kumada–Corriu and Suzuki–Miyaura coupling reactions of aryl halides with organometallic reagents. |
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