Synthesis, Structures, and Norbornene Polymerization Behavior of Bis(aryloxide-N-heterocyclic carbene) Nickel Complexes
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- 作者：Yong Kong ; Man Cheng ; Hongping Ren ; Shansheng Xu ; Haibin Song ; Min Yang ; Binyuan Liu ; Baiquan Wang
- 刊名：Organometallics
- 出版年：2011
- 出版时间：March 28, 2011
- 年：2011
- 卷：30
- 期：6
- 页码：1677-1681
- 全文大小：905K
- 年卷期：v.30,no.6(March 28, 2011)
- ISSN：1520-6041
文摘
Treatment of the o-hydroxyaryl imidazolinium pro-ligands (2-OH-3,5-tBu2C6H2)(R)(C3H3N2)+Br鈭?/sup> [R = iPr (1a), tBu (1b), Ph (1c), Mes (1d)] with NiL2Cl2 (L = PPh3, Py) or Ni(OAc)2路4H2O afforded the corresponding cis bis(aryloxide-NHC) nickel complexes 2鈭?b>5. Notably, the products were independent from the pro-ligands/Ni ratios. The same complexes were obtained with the pro-ligands/Ni ratio of 1:1 or 2:1. All the complexes were characterized by 1H and 13C NMR, high-resolution mass spectrometry (HRMS), and elemental analysis. The molecular structures of the aryloxide-NHC-ligated nickel complexes 2鈭?b>5 were determined by single-crystal X-ray diffraction analysis. With methylaluminoxane (MAO) as cocatalyst, the nickel complexes showed moderate catalytic activities (106 g of PNB (mol of Ni)鈭? h鈭?) in the addition polymerization of norbornene.