Heterogeneous constrained-geometry zirconium catalysts

被引：32

作者：

Juvaste, H

Pakkanen, TT

Iiskola, EI

机构：

[1] Univ Joensuu, Dept Chem, FIN-80101 Joensuu, Finland

[2] VTT Chem Technol, FIN-02044 Espoo, Finland

来源：

ORGANOMETALLICS | 2000年 / 19卷 / 09期

关键词：

D O I：

10.1021/om990741c

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Heterogeneous constrained-geometry catalysts were prepared by immobilizing Zr(NMe2)a on a heterogenized ansa-cyclopentadienylamino ligand of type (RN)R'R"Si(C5R"'(4)): surface 1, R = -O-Me2Si(CH2)(3); R', R", R"' = Me; surface 2, R = -O-Me2Si(CH2)(3); R', R"' = Me, R" = a The preparation of the constrained-geometry catalyst ligand on a silica surface has been carried out in two steps: first: functionalizing the silica surface with aminopropyldimethylethoxysilane (APDMES) by using saturated gas-solid reactions, and then immobilizing two different (tetramethylcyclopentadienyl)chlorosilan Me2Si(C5Me4H)Cl and MeHSi(C5Me4H)Cl, on the APDMES-functionalized silica by utilizing n-BuLi (n-butyllithium). Zr(NMe2)(4) was immobilized on the heterogeneous surfaces using the amine elimination reaction. The two heterogeneous monocyclopentadienylamido zirconium catalysts were characterized with H-1, C-13, and Si-29 solid-state NMR and FTIR spectroscopy and tested for ethylene polymerization.

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页码：1729 / 1733

页数：5

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