Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 1, Pages 126-133Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201801179
Keywords
Nickel; Pincer ligands; beta-Diketiminato frameworks; Aryl fluorides; Cross-coupling; Homogeneous catalysis
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Funding
- JSPS KAKENHI [25410063, JP17K05805]
- Collaborative Research Program of the Institute for Chemical Research, Kyoto University [2018-24]
- Grants-in-Aid for Scientific Research [25410063] Funding Source: KAKEN
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A beta-diketiminato-based tridentate pincer-type nickel(II) complex Ni-NNP was prepared by the reaction of the nickel(II) precursor [NiCl2(2,4-lutidine)(2)] with the lithiated NNP ligand, which was generated in situ by the reaction of the NNP pro-ligand H-NNP with nBuLi. H-NNP was prepared by the condensation of 4-[(2,4,6-trimethylphenyl)amino]pent-3-en-2-one with 2-(diphenylphosphanyl)ethylamine. Ni-NNP was characterized spectroscopically and by X-ray diffraction, revealing a slightly distorted square-planar geometry around the nickel center. Density functional theory calculations indicated that the highest occupied molecular orbital in Ni-NNP is located at higher energy than those of three other homologous nickel(II) complexes, i.e., Ni-ONN, Ni-ONP, and Ni-NNN, which contain beta-aminoketonato- or beta-diketiminato-based pincer-type ligands. The electronic and steric properties of Ni-NNP effectively facilitated the cross-coupling of aryl fluorides with aryl Grignard reagents.
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