Journal
ORGANOMETALLICS
Volume 27, Issue 22, Pages 5911-5920Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om800711g
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Funding
- NSF of China [20572096]
- Zhejiang Provincial Natural Science Foundation [R405066]
- Qianjiang Project [2007R10006]
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[Ni-2(3,5-bis(N-methylimidazolylidenylmethyl)pyrazolate)(2)](PF6)(2) (1), [Ni-2(mu-OH)(3,5-bis(N-pycolylimidazolylidenylmethyl)pyrazolate)](PF6)(2) (2), and [Ni-2(mu-OH)(3,5-bis(N-pyridylimidazolylidenylmethyl)pyrazolate)](PF6)(2) (3) have been prepared from the corresponding imidazolium salts via in situ generated silver-carbene complexes. The complexes and imidazolium salts were characterized by elemental analyses and NMR spectroscopy. The structures of 1-3 were identified by X-ray diffraction analysis. In complex 1, two nickel(II) ions are sandwiched by two 3,5-bis(N-methylimidazolylidenylmethyl)pyrazolates behaving as anionic tetradentate ligands. Complexes 2 and 3 contain Ni-2(mu-OH) cores with two nickel centers bridged by anionic hexadentate imidazolylidene ligands. Complexes 2 and 3 show excellent catalytic activities in Suzuki-Miyaura and Kumada-Corriu coupling reactions of various aryl chlorides. The cross-coupling reactions of deactivated aryl chlorides with arylboronic acids and Grignard reagents have been accomplished in excellent yields at low catalyst loadings.
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