Synthesis of Tetramethylcyclopentadienyl-phenoxytitanium Dichlorides and Their Catalytic Properties for Ethylene Polymerization

Abstract

Abstract: Four constrained geometry tetramethylcyclopentadienyl-phenoxytitanium dichlorides 4-R₁-6-R-2-Me₄Cp-PhOTiCl₂[R₁= ^tBu, R= ^tBu(5); R₁=H, R= ^tBu(6), Ph(7), Me(8)] were successfully prepared from the reaction of TiCl₄ with the corresponding trimethylsilyl-functionalized ligands, which was obtained by treating the ligands 4-R₁-6-R-2-Me₄CpH-PhOH[R₁= ^tBu, R= ^tBu(1); R₁=H, R= ^tBu(2), Ph(3), Me(4)] with nBuLi and Me₃SiCl subsequently. The yields are higher than those previously reported. When activated with iBu₃Al and Ph₃C⁺B(C₆F₅)-₄, complexes 5—8 exhibit a reasonable catalytic activity for ethylene polymerization, producing ethyl branched polyethylenes. Influences of the molecular structure of these complexes and polymerization conditions on their catalytic properties were studied. Polyethylenes obtained with these catalysts were characterized.

Key words: Metallocene catalysts, Olefin polymerization, Monocyclopentadienyl titanium complex, Homogeneous catalysis

CLC Number:

O643.36

TrendMD:

ZHANG Yue-Tao, MU Ying, LV Chun-Sheng, ZHANG Fan, CHEN Cong-Xi . Synthesis of Tetramethylcyclopentadienyl-phenoxytitanium Dichlorides and Their Catalytic Properties for Ethylene Polymerization[J]. Chem. J. Chinese Universities, 2005, 26(3): 571.

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Synthesis of Tetramethylcyclopentadienyl-phenoxytitanium Dichlorides and Their Catalytic Properties for Ethylene Polymerization

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