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

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

16 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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10.1016/j.jorganchem.2004.08.013

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@article{20f37e69c70a4cffb228acf8044e587f,

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

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}",

year = "2004",

month = oct,

day = "15",

doi = "10.1016/j.jorganchem.2004.08.013",

language = "English",

volume = "689",

pages = "3402--3411",

journal = "Journal of Organometallic Chemistry",

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TY - JOUR

T1 - Control of symmetry in active cationic ansa-zirconocene species

T2 - Catalyst preparation, characterization and ethylene-norbornene copolymerization

AU - Lee, Hyosun

AU - Hong, Sung Don

AU - Park, Young Whan

AU - Jeong, Boong Goon

AU - Nam, Dae Woo

AU - Jung, Hye Young

AU - Jung, Min Whan

AU - Song, Kwang Ho

PY - 2004/10/15

Y1 - 2004/10/15

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.

KW - Bent metallocene

KW - Borane

KW - Borate

KW - Copolymerization

KW - Ethylene

KW - Ion pair

KW - Norbornene

KW - Zwitterion

KW - ansa-Zirconocene

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U2 - 10.1016/j.jorganchem.2004.08.013

DO - 10.1016/j.jorganchem.2004.08.013

M3 - Article

AN - SCOPUS:4644252368

SN - 0022-328X

VL - 689

SP - 3402

EP - 3411

JO - Journal of Organometallic Chemistry

JF - Journal of Organometallic Chemistry

IS - 21

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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