Unsymmetrical NCN-pincer mononuclear and dinuclear nickel(ii) complexes of N-heterocyclic carbene (NHC): synthesis, structure and catalysis for Suzuki-Miyaura cross-coupling.
作者： Shaojin Gu , Jiehao Du , Jingjing Huang , Yun Guo , Ling Yang
DOI: 10.1039/C6DT03944H
关键词:
摘要: This report describes the synthesis and characterization of a family unsymmetrical NCN pincer Ni(II) complexes 2–8 with NHC-triazole arms. All these have been fully characterized by X-ray single crystal analysis, NMR spectroscopy, elemental analysis. Complexes 2 4–6 were square planar chloride trans to carbene carbon atoms. Complex 3 was paramagnetic octahedral complex its central metal surrounded two ligands. 7 8 contain [(NHC)2Ni2-OH] moieties bearing OH bridge. Both [(NCNHCN)Ni-Cl] synthesized similarly via reactions in situ formed Ag–NHCs from corresponding imidazolium salts [NiCl2(PPh3)2]. The catalytic activities all for Suzuki–Miyaura cross-coupling examined. Under optimized conditions, 4 active aryl iodides bromides at 110 °C. Aryl chlorides successfully coupled presence triphenylphosphine as an additive.
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