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http://ir.ncue.edu.tw/ir/handle/987654321/18925
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| 題名: | Nickel(II) Complexes of Bidentate N-Heterocyclic Carbene/Phosphine Ligands: Efficient Catalysts for Suzuki Coupling of Aryl Chlorides |
| 作者: | Lee, Chun-Chin;Ke, Wei-Chi;Chan, Kai-Ting;Lai, Chun-Liang;Hu, Ching-Han;Lee, Hon Man |
| 貢獻者: | 化學系 |
| 日期: | 2007-01
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| 上傳時間: | 2014-08-14T04:29:09Z
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| 出版者: | WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| 摘要: | Nickel(II) complexes of bidentate N-heterocyclic carbene (NHC)/phosphane ligand L were prepared and structurally characterized. Unlike palladium, which forms PdCl(2)(L), the stable nickel product isolated is the ionic Ni(L)(2)Cl(2). These Ni(II) complexes are highly robust in air. Among different N-substituents on the ligand framework, the nickel complex of ligand L bearing N-1-naphthylmethyl groups (2 a) is a highly effective catalyst for Suzuki cross-coupling between phenylboronic acid and a range of aryl halides, including unreactive aryl chlorides. The activities of 2 a are largely superior to those of other reported nickel NHC complexes and their palladium counterparts. Unlike the previously reported NiCl(2)(dppe) (dppe=1,2-bis(diphenylphosphino)ethane), 2 a can effectively catalyze the cross-coupling reaction without the need for a catalytic amount of PPh(3), and this suggests that the PPh(2) functionality of hybrid NHC ligand L can partially take on the role of free PPh(3). However, for unreactive aryl chlorides at low catalyst loading, the presence of PPh(3) accelerates the reaction. |
| 關聯: | Chemistry - A European Journal, 13(2): 582-591 |
| 顯示於類別: | [化學系] 期刊論文
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