State Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou, 215123, People's Republic of China, China.
Dalton Trans. 2012 Apr 21;41(15):4552-7. doi: 10.1039/c2dt12052f. Epub 2012 Feb 27.
Several new nickel complexes are prepared by the treatment of the stabilized ylide benzoylmethylenetri(2-alkoxylphenyl)phosphorane with Ni(cod)(2) in the presence of PPh(3). X-Ray diffraction studies reveal that a distorted square planar geometry around Ni(II) is adopted. Upon treatment with Ni(cod)(2), the nickel complexes are sufficiently robust for ethylene polymerization. The existence of 2-alkoxyl-aryl substituents on phosphorus improves the catalytic activities. The highest activity (2.1 × 10(6) g mol(-1) h(-1)) is achieved when tri(2-isopropoxy-phenyl)phosphorane is employed (5e), which is one order higher than the corresponding SHOP catalyst. NMR analysis shows that the polyethylene mainly contains terminal double bonds and is highly linear.
几种新的镍配合物通过在 PPh(3)存在下用 Ni(cod)(2)处理稳定的叶立德苯甲酰亚甲基三(2-烷氧基苯基)膦来制备。X 射线衍射研究表明，Ni(II)周围采用扭曲的正方形平面几何结构。用 Ni(cod)(2)处理后，镍配合物对于乙烯聚合具有足够的稳定性。磷上的 2-烷氧基-芳基取代基的存在提高了催化活性。当使用三(2-异丙氧基-苯基)膦时，获得了最高的活性(2.1×10(6)gmol(-1)h(-1))(5e)，比相应的 SHOP 催化剂高一个数量级。NMR 分析表明，聚乙烯主要含有末端双键，并且具有高度线性。
