Constrained geometry tetramethylcyclopentadienyl-phenoxy titanium complexes: Synthesis, structures and catalytic properties for ethylene polymerization

被引：5

作者：

Xu, Jian-Sheng

Zhang, Yue-Tao

Li, Guang-Hua

Mu, Ying

Feng, Shou-Hua

机构：

[1] Jilin Univ, Sch Chem, Minist Educ, Key Lab Supramol Struct & mat, Changchun 130021, Peoples R China

[2] Jilin Univ, Sch Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130021, Peoples R China

来源：

POLYHEDRON | 2006年 / 25卷 / 15期

基金：

中国国家自然科学基金;

关键词：

constrained geometry catalysts; metallocenes; titanium complexes; thermocyclization; ethylene polymerization;

D O I：

10.1016/j.poly.2006.05.015

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The synthesis of a new bidentate ligand, 1-(2-methoxyphenyl)-2,3,4,5-tetramethyl-cyclopentadiene (1), as well as its corresponding constrained geometry titanium complex, 2-tetramethylcyclopentadienyl-phenoxytitanium dichloride [(TCP)TiCl2, 2], was described. Complex 2 was synthesized by reaction of TiCl4 With the lithium salt of 1, followed by CH3Cl elimination at 65 degrees C. Molecular structures of 2 and a known complex, 2-tetramethylcyclopentadienyl-6-methyl-phenoxytitanium dichloride [(TCMP)TiCl2, IVd], were determined by single-crystal X-ray diffraction. The Cp(cent)-Ti-O angles of 107.4 degrees for 2, 107.0 degrees for IVd reveal their sterically open features as catalyst precursors. When activated with Al'Bu-3 and Ph3C+B(C6F5)(4)(-), complex 2 exhibits reasonable catalytic activity for ethylene polymerization, producing polyethylenes with moderate molecular weights and melting points. (C) 2006 Elsevier Ltd. All rights reserved.

引用

页码：3071 / 3076

页数：6

共 42 条

[1] Amido functionalized ansa half-sandwich dichloride complexes of titanium, zirconium and hafnium with alkyl and ω-alkenyl substituents as homogeneous and self-immobilizing catalyst precursors for ethylene polymerization [J].