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 language | English |
|---|---|
| Pages (from-to) | 3402-3411 |
| Number of pages | 10 |
| Journal | Journal of Organometallic Chemistry |
| Volume | 689 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 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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Cite this
Lee, H., Hong, S. D., Park, Y. W., Jeong, B. G., Nam, D. W., Jung, H. Y., Jung, M. W., & Song, K. H. (2004). Control of symmetry in active cationic ansa-zirconocene species: Catalyst preparation, characterization and ethylene-norbornene copolymerization. Journal of Organometallic Chemistry, 689(21), 3402-3411. https://doi.org/10.1016/j.jorganchem.2004.08.013