Control of symmetry in active cationic ansa-zirconocene species: Catalyst preparation, characterization and ethylene-norbornene copolymerization

Hyosun Lee, Sung Don Hong, Young Whan Park, Boong Goon Jeong, Dae Woo Nam, Hye Young Jung, Min Whan Jung, Kwang Ho Song

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

New bis-hydrocarbyl complexes of methylene bridged ansa-metallocenes [H2Me2H2)2]ZrR2 {R = Me (1), CH2Ph (2), CH2SiMe3 (3), Ph (4)} have been prepared. They form catalytically active intermediates with borane or borate depending on solvent and Zr-R group. Specifically, [H2C(Me2C5H2)2] Zr(CH2Ph)2 (2) produced an ion pair upon treatment with B(C6F5)3 whereas [H2 C(Me2C5H2)2]Zr(CH2 SiMe3)2 (3) produced a zwitterionic species, identified by 1H,13C, and 19F NMR spectroscopy. Copolymerization of ethylene and norbornene for the metallocene dichloride/MAO and bis-hydrocarbyl complex/borate systems was compared.

Original languageEnglish
Pages (from-to)3402-3411
Number of pages10
JournalJournal of Organometallic Chemistry
Volume689
Issue number21
DOIs
Publication statusPublished - 2004 Oct 15

Keywords

  • Bent metallocene
  • Borane
  • Borate
  • Copolymerization
  • Ethylene
  • Ion pair
  • Norbornene
  • Zwitterion
  • ansa-Zirconocene

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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