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 [H 2Me 2H 2) 2]ZrR 2 {R = Me (1), CH 2Ph (2), CH 2SiMe 3 (3), Ph (4)} have been prepared. They form catalytically active intermediates with borane or borate depending on solvent and Zr-R group. Specifically, [H 2C(Me 2C 5H 2) 2] Zr(CH 2Ph) 2 (2) produced an ion pair upon treatment with B(C 6F 5) 3 whereas [H 2 C(Me 2C 5H 2) 2]Zr(CH 2 SiMe 3) 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

Fingerprint

Borates
copolymerization
Copolymerization
Ethylene
ethylene
methylidyne
Boranes
catalysts
preparation
Catalysts
Monoamine Oxidase
symmetry
Organometallics
borates
Nuclear magnetic resonance spectroscopy
Magnetic Resonance Spectroscopy
Ions
boranes
dichlorides
methylene

Keywords

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

ASJC Scopus subject areas

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

Cite this

Control of symmetry in active cationic ansa-zirconocene species : Catalyst preparation, characterization and ethylene-norbornene copolymerization. / Lee, Hyosun; Hong, Sung Don; Park, Young Whan; Jeong, Boong Goon; Nam, Dae Woo; Jung, Hye Young; Jung, Min Whan; Song, Kwang Ho.

In: Journal of Organometallic Chemistry, Vol. 689, No. 21, 15.10.2004, p. 3402-3411.

Research output: Contribution to journalArticle

Lee, Hyosun ; Hong, Sung Don ; Park, Young Whan ; Jeong, Boong Goon ; Nam, Dae Woo ; Jung, Hye Young ; Jung, Min Whan ; Song, Kwang Ho. / Control of symmetry in active cationic ansa-zirconocene species : Catalyst preparation, characterization and ethylene-norbornene copolymerization. In: Journal of Organometallic Chemistry. 2004 ; Vol. 689, No. 21. pp. 3402-3411.
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AB - New bis-hydrocarbyl complexes of methylene bridged ansa-metallocenes [H 2Me 2H 2) 2]ZrR 2 {R = Me (1), CH 2Ph (2), CH 2SiMe 3 (3), Ph (4)} have been prepared. They form catalytically active intermediates with borane or borate depending on solvent and Zr-R group. Specifically, [H 2C(Me 2C 5H 2) 2] Zr(CH 2Ph) 2 (2) produced an ion pair upon treatment with B(C 6F 5) 3 whereas [H 2 C(Me 2C 5H 2) 2]Zr(CH 2 SiMe 3) 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.

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