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- W1968006988 abstract "A novel dinuclear ansa-zirconocene catalyst (μ-C12H8{[SiPh(Ind)2]ZrCl2}2) (I) was prepared by a Wurtz coupling reaction between two equivalent of bisindenylphenylchlorosilane and one equivalent of 4,4′-dibromobiphenyl in THF at reflux temperature for 12 h, followed by a successive reaction with ZrCl4·2THF in THF at −78°C. Polymerization of ethene was conducted in a 300 cm3 glass reactor equipped with a stirrer at 40, 60, 80 and 100°C using MAO or Ph3C[B(C6F5)4] as cocatalyst and toluene as the solvent. The catalyst (I) gave linear polyethene with a broader molecular mass distribution (MMD) in a much higher yield as compared to the corresponding mononuclear catalyst derived from [Ph2Si(Ind)2]ZrCl2 (II). The apparent activity increased monotonously from 40°C up to 100°C. The replacement of MAO with Ph3C[B(C6F5)4] gave polyethene with a higher molecular weight." @default.
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- W1968006988 date "1998-02-01" @default.
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- W1968006988 title "Synthesis of a dinuclear ansa-zirconocene catalyst having a biphenyl bridge and application to ethene polymerization" @default.
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- W1968006988 doi "https://doi.org/10.1016/s1381-1169(97)00180-5" @default.
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