title: Synthesis, structure, and ethylene polymerization behavior of nickel complexes based on benzoylmethylenetri(2-alkoxylphenyl)phosphorane.
abstract: 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.
authors.affiliation: 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.
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Wan
authors.forename: Yan-Shan
authors.initials: YS
authors.lastname: Gao
authors.forename: Jun-Fang
authors.initials: JF
authors.lastname: Li
authors.forename: Qi
authors.initials: Q
authors.lastname: Shen
authors.forename: Xiu-Li
authors.initials: XL
authors.lastname: Sun
authors.forename: Yong
authors.initials: Y
authors.lastname: Tang