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

doi:10.1016/j.jorganchem.2004.08.013

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

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	3402-3411
Number of pages	10
Journal	Journal of Organometallic Chemistry
Volume	689
Issue number	21
DOIs	https://doi.org/10.1016/j.jorganchem.2004.08.013
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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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 journal › Article › peer-review

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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.",

keywords = "Bent metallocene, Borane, Borate, Copolymerization, Ethylene, Ion pair, Norbornene, Zwitterion, ansa-Zirconocene",

author = "Hyosun Lee and Hong, {Sung Don} and Park, {Young Whan} and Jeong, {Boong Goon} and Nam, {Dae Woo} and Jung, {Hye Young} and Jung, {Min Whan} and Song, {Kwang Ho}",

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AU - Jeong, Boong Goon

AU - Nam, Dae Woo

AU - Jung, Hye Young

AU - Jung, Min Whan

AU - Song, Kwang Ho

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N2 - 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.

AB - 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.

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