Structural characterization of ansa-zirconocene dichloride bearing a vicinal di-tert-butylcyclopentadienyl ligand and high pressure polymerization of 1-hexene catalyzed by sterically hindered zirconocene complexes

被引：16

作者：

Suzuki, N ^{[1
]}

Mise, T ^{[1
]}

Yamaguchi, Y ^{[1
]}

Chihara, T ^{[1
]}

Ikegami, Y ^{[1
]}

Ohmori, H ^{[1
]}

Matsumoto, A ^{[1
]}

Wakatsuki, Y ^{[1
]}

机构：

[1] Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 1998年 / 560卷 / 1-2期

关键词：

zirconocene; olefin polymerization; high pressure; 1-hexene; tert-butyl group;

D O I：

10.1016/S0022-328X(98)00524-5

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

An ansa-zirconocene complex having a vicinally di-tert-butyl-substituted cyclopentadienyl ligand, Me2Si(C5H4)(C5H2-3,4-t-Bu-2)ZrCl2 (1), has been synthesized and characterized by X-ray diffraction (orthorhombic, space group: Pbca, a = 18.3690(8), b = 18.0749(12), c = 13.2039(9) Angstrom, V = 4383.9(4) Angstrom(3), Z = 8, R = 0.0283, R-w = 0.0291). Complex 1 has a very much twisted structure due to its steric repulsion. In solution, however, the two tert-butyl groups are magnetically equivalent even at -80 degrees C, indicating very fast oscillation of the bridged cyclopentadienyl unit with respect to the metal center. Complex 1 and nonbridged zirconocene dichlorides with tert-butyl-substituted cyclopentadienyl ligands, (C5H4-t-Bu)(2)ZrCl2 (2), (C5H3-1,2-t-Bu-2)(2)ZrCl2 (3) and (C5H3-1,3-t-Bu-2)(2)ZrCl2 (4), have been employed as methylaluminoxane (MAO)-activated catalysts for polymerization of 1-hexene under high pressure conditions (100-750 MPa = ca. 1000-7500 atm). Comparison with some non and methyl-substituted metallocenes are also discussed. (C) 1998 Elsevier Science S.A. All rights reserved.

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页码：47 / 54

页数：8

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