Synthesis of Three Different Carbon Bridged Dinuclear Titanocene Complexes as Catalysts for Ethylene Polymerization

Abstract

Abstract: Three different dinuclear titanocene complexes (CH₃)₂C[(C₅H₄)TiCl₂(C₅H₅)]₂(3),(CH₂)·n[(C₅H₄)TiCl₂(C₅H₅)]₂(6, n=3; 7, n=4) were synthesized by the reaction of the corresponding dilithiumed salts with two equivalents of CpTiCl₃in toluene. The yield of the corresponding dinuclear titanocene complex in toluene is higher than that in THF, in which CpTiCl₃may be disproportionated to form Cp²TiCl₂. All titanocenes are characterized by ¹HNMR. The catalytic properties of the dinuclear titanocene complexes for ethylene polymerization were investigated in the presence of MAO(methylaluminoxane). For the ethylene polymerization catalyzed by compound 7/MAO, the catalytic activity increases with the increase of n(Al)/n(Cat.), the moleculer weight of polyethylene reaches 9.0102×10⁴. With the prolongation of the polymerization time, the catalytic activity declines while the molecular weight of polyethylene increases. At50 ℃, the molecular weight of the polymer reaches up to 7.77×10⁴. However, it decreases rapidly along with rising reaction temperature. When the length of the bridged ligand increases, the polymerization activity increases with the increase of the bridge length while the molecular weight decreases accordingly.

Key words: Dinuclei, Titanocene complex, Ethylene, Polymerization

CLC Number:

O627

TrendMD:

BAN Qing, SUN Jun-Quan . Synthesis of Three Different Carbon Bridged Dinuclear Titanocene Complexes as Catalysts for Ethylene Polymerization[J]. Chem. J. Chinese Universities, 2003, 24(12): 2304.

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Synthesis of Three Different Carbon Bridged Dinuclear Titanocene Complexes as Catalysts for Ethylene Polymerization

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