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Issue 2, 2017
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Unsymmetrical NCN-pincer mononuclear and dinuclear nickel(II) complexes of N-heterocyclic carbene (NHC): synthesis, structure and catalysis for Suzuki–Miyaura cross-coupling

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Abstract

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

Graphical abstract: Unsymmetrical NCN-pincer mononuclear and dinuclear nickel(ii) complexes of N-heterocyclic carbene (NHC): synthesis, structure and catalysis for Suzuki–Miyaura cross-coupling

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Publication details

The article was received on 13 Oct 2016, accepted on 08 Dec 2016 and first published on 08 Dec 2016


Article type: Paper
DOI: 10.1039/C6DT03944H
Citation: Dalton Trans., 2017,46, 586-594
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    Unsymmetrical NCN-pincer mononuclear and dinuclear nickel(II) complexes of N-heterocyclic carbene (NHC): synthesis, structure and catalysis for Suzuki–Miyaura cross-coupling

    S. Gu, J. Du, J. Huang, Y. Guo, L. Yang, W. Xu and W. Chen, Dalton Trans., 2017, 46, 586
    DOI: 10.1039/C6DT03944H

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