Synthesis of zirconocene amides and ketimides and an investigation into their ethylene polymerization activity

K.W. Henderson, A. Hind, A.R. Kennedy, A.E. McKeown, R.E. Mulvey

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The zirconocene amide [Cp2Zr(Cl)N(CH2Ph)(2)] (5), and the zirconbcene ketimides [Cp2Zr(Cl)N=C(Bu')Ph] (7), and [Cp2Zr(Cl)N=C(NMe2)(2)] (9), have been prepared by the transmetallation reactions between the appropriate lithiated organonitrogen compounds and zirconocene dichloride (2). In addition, their methylated derivatives [Cp2Zr(Me)N(CH2Ph)(2)] (6), [Cp2Zr(Me)N=C(Bu')Ph] (8), and [Cp2Zr(Me)N=C(NMe2)(2)] (10), have been prepared by the reaction of each of the complexes 5, 7 and 9 with MeLi. Compounds 5 and 7 have been characterized by X-ray crystallography and the structure of the cocrystalline complex [Cp2Zr(Cl)N=C(Bu)Ph](0.4)[Cp2Zr(Me)N=C(Bu')Ph](0.6) (14), has similarly been determined. All of the complexes 5-10 are active catalysts for the polymerization of ethylene in the presence of a MAO cocatalyst. In contrast, no polymer was produced using B(C6F5)(3) as an activator, indicating that direct alkene insertion into the Zr-N bonds does not occur.
Original languageEnglish
Pages (from-to)63-70
Number of pages7
JournalJournal of Organometallic Chemistry
Volume656
Issue number1-2
DOIs
Publication statusPublished - 15 Aug 2002

Keywords

  • zirconium
  • amides
  • ketimides
  • catalysis
  • polymerization

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