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.
ASJC Scopus subject areas
- Inorganic Chemistry