A 3+ metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by a anionic multidentate ligand and at least two monoanionic ligands. The multidentate ligand and the transition metal form a metallocycle having at least five primary atoms, counting any &pgr;-bound cyclopentadienyl group in the metallocycle as two primary atoms. Olefin polymerization is exemplified.
Polymerization of conjugated dienes with a homogeneous Ziegler–Natta catalytic system based on a carbon-bridged bis(phenolate) yttrium alkyl complex
作者:Kan Hong、Zhenhua Liang、Xufeng Ni、Zhiquan Shen
DOI:10.1039/c6ra06144c
日期:——
A novel carbon-bridged bis(phenolate) yttrium alkyl complex [(EDBP)Y(CH2SiMe3)(THF)3] (1) was synthesized by a reaction of 2,2′-ethylidene-bis(4,6-di-tert-butyl-phenol) (EDBPH2) and Y(CH2SiMe3)3. The structure of complex 1 was determined by X-ray crystallography. Homo- and copolymerization of isoprene and 1,3-butadiene was carried out and catalyzed by the 1/MAO/triisobutylaluminum (TIBA) system. The