Ansa-Metallocene Complexes(V)- Synthesis and Application in Olefin Polymerization ofGerma-bridged Indenyl and Substituted Indenyl Zirconium Complexes

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (4): 595.

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Ansa-Metallocene Complexes(V)- Synthesis and Application in Olefin Polymerization ofGerma-bridged Indenyl and Substituted Indenyl Zirconium Complexes

XU Shan-Sheng^1,2, TIAN Gong-Lu^1,2, WANG Bai-Quan^1,2, ZHOU Xiu-Zhong^1,2, LIANG Bo³, ZHAO Liang³

1. Department of Chemistry, State Key laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China;
2. State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China;
3. Beijing Chemical Research Institution, Beijing 100013, China

Received:2000-12-22 Online:2002-04-24 Published:2002-04-24

Abstract

Abstract: Germa-bridged indenyl and substituted indenyl ligands react with n-butyl lithium and ZrCl₄ togive Germa-bridged indenyl and substituted indenyl zirconium complexes Me,Ge (2-R¹-4-R²-Ind)₂ ZrCl₂[R¹=R²=H(1); R¹=Me, R² =H(2);R¹=Me, R²=Ph(3) ].Compounds 1-3 are mixture of rac andmeso isomers.After fractional crystallization pure rac-1, rac-2 and meso-3 were isolated.Compounds 1-3were characterized by ¹H NMR and elemental analyses and used for the polymerization of ethylene andpropylene in the presence of methyl aluminoxane (MAO).The molecular weight distribution of thepolyethylene obtained with compounds 1-3 is slightly broader than that with general metallocenes.A-mong them, the molecular weight distribution of the polyethylene obtained with the mixture of rac-3 andmeso-3 is much broader due to the two unequal catalytic active centers in the system.Compounds rac-1 andrac-2 catalyzed propylene polymerization to give isotactic polypropylene.

Key words: Ansa-Metallocene, Olefin polymerization, Isotactic polypropylene, Zirconium

CLC Number:

O627

TrendMD:

XU Shan-Sheng, TIAN Gong-Lu, WANG Bai-Quan, ZHOU Xiu-Zhong, LIANG Bo, ZHAO Liang. Ansa-Metallocene Complexes(V)- Synthesis and Application in Olefin Polymerization ofGerma-bridged Indenyl and Substituted Indenyl Zirconium Complexes[J]. Chem. J. Chinese Universities, 2002, 23(4): 595.

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Ansa-Metallocene Complexes(V)- Synthesis and Application in Olefin Polymerization ofGerma-bridged Indenyl and Substituted Indenyl Zirconium Complexes

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