Syntheses of 2,5-dimethylcyclopentadienyl ansa-zirconocene complexes and their reactivity for ethylene/norbornene copolymerization

Eun Sook Cho; Ui Gab Joung; Bun Yeoul Lee; Hyosun Lee; Young Whan Park; Choong Hoon Lee; Dong Mok Shin

doi:10.1021/om049610o

Syntheses of 2,5-dimethylcyclopentadienyl ansa-zirconocene complexes and their reactivity for ethylene/norbornene copolymerization

Eun Sook Cho, Ui Gab Joung, Bun Yeoul Lee, Hyosun Lee, Young Whan Park, Choong Hoon Lee, Dong Mok Shin

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Abstract

C1-bridged and Me₂Si-bridged 2,5-dimethylcylcopentadienyl ansa-zirconocene complexes, [Me(H)C(C₅H₄)(2,5-Me ₂C₅H₂)]ZrCl₂ (6), [(CH ₃CH₂CH₂)(H)C(C₅H₄)(2,5- Me₂C₅H₂)]ZrCl₂ (9), [(Me)(H)C(2,5-Me₂C₅H₂)₂]ZrCl ₂ (13), and [Me₂Si(2,5-Me2C₅H₂) ₂]ZrCl₂ (15), are prepared by using 2-bromo-3-methoxy-2,5- dimethylcyclopentene (7) as a starting material. Solid structures of 6 and 13 were determined by X-ray crystallography. The C1-bridged zirconocene complexes 6, 9, and 13 are highly active for ethylene/norbornene copolymerization with high incorporation of norbornene, while the Me₂Si-bridged complex 15 shows relatively low activity. Complex 9 shows the highest activity and the highest incorporation of norbornene among the complexes, but the molecular weight of the obtained polymer is relatively low.

Original language	English
Pages (from-to)	4693-4699
Number of pages	7
Journal	Organometallics
Volume	23
Issue number	20
DOIs	https://doi.org/10.1021/om049610o
State	Published - 27 Sep 2004

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@article{e1ca7989d506497ab46e5ce0446a05b5,

title = "Syntheses of 2,5-dimethylcyclopentadienyl ansa-zirconocene complexes and their reactivity for ethylene/norbornene copolymerization",

abstract = "C1-bridged and Me2Si-bridged 2,5-dimethylcylcopentadienyl ansa-zirconocene complexes, [Me(H)C(C5H4)(2,5-Me 2C5H2)]ZrCl2 (6), [(CH 3CH2CH2)(H)C(C5H4)(2,5- Me2C5H2)]ZrCl2 (9), [(Me)(H)C(2,5-Me2C5H2)2]ZrCl 2 (13), and [Me2Si(2,5-Me2C5H2) 2]ZrCl2 (15), are prepared by using 2-bromo-3-methoxy-2,5- dimethylcyclopentene (7) as a starting material. Solid structures of 6 and 13 were determined by X-ray crystallography. The C1-bridged zirconocene complexes 6, 9, and 13 are highly active for ethylene/norbornene copolymerization with high incorporation of norbornene, while the Me2Si-bridged complex 15 shows relatively low activity. Complex 9 shows the highest activity and the highest incorporation of norbornene among the complexes, but the molecular weight of the obtained polymer is relatively low.",

author = "Cho, {Eun Sook} and Joung, {Ui Gab} and Lee, {Bun Yeoul} and Hyosun Lee and Park, {Young Whan} and Lee, {Choong Hoon} and Shin, {Dong Mok}",

year = "2004",

month = sep,

day = "27",

doi = "10.1021/om049610o",

language = "English",

volume = "23",

pages = "4693--4699",

journal = "Organometallics",

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publisher = "American Chemical Society",

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T1 - Syntheses of 2,5-dimethylcyclopentadienyl ansa-zirconocene complexes and their reactivity for ethylene/norbornene copolymerization

AU - Cho, Eun Sook

AU - Joung, Ui Gab

AU - Lee, Bun Yeoul

AU - Lee, Hyosun

AU - Park, Young Whan

AU - Lee, Choong Hoon

AU - Shin, Dong Mok

PY - 2004/9/27

Y1 - 2004/9/27

N2 - C1-bridged and Me2Si-bridged 2,5-dimethylcylcopentadienyl ansa-zirconocene complexes, [Me(H)C(C5H4)(2,5-Me 2C5H2)]ZrCl2 (6), [(CH 3CH2CH2)(H)C(C5H4)(2,5- Me2C5H2)]ZrCl2 (9), [(Me)(H)C(2,5-Me2C5H2)2]ZrCl 2 (13), and [Me2Si(2,5-Me2C5H2) 2]ZrCl2 (15), are prepared by using 2-bromo-3-methoxy-2,5- dimethylcyclopentene (7) as a starting material. Solid structures of 6 and 13 were determined by X-ray crystallography. The C1-bridged zirconocene complexes 6, 9, and 13 are highly active for ethylene/norbornene copolymerization with high incorporation of norbornene, while the Me2Si-bridged complex 15 shows relatively low activity. Complex 9 shows the highest activity and the highest incorporation of norbornene among the complexes, but the molecular weight of the obtained polymer is relatively low.

AB - C1-bridged and Me2Si-bridged 2,5-dimethylcylcopentadienyl ansa-zirconocene complexes, [Me(H)C(C5H4)(2,5-Me 2C5H2)]ZrCl2 (6), [(CH 3CH2CH2)(H)C(C5H4)(2,5- Me2C5H2)]ZrCl2 (9), [(Me)(H)C(2,5-Me2C5H2)2]ZrCl 2 (13), and [Me2Si(2,5-Me2C5H2) 2]ZrCl2 (15), are prepared by using 2-bromo-3-methoxy-2,5- dimethylcyclopentene (7) as a starting material. Solid structures of 6 and 13 were determined by X-ray crystallography. The C1-bridged zirconocene complexes 6, 9, and 13 are highly active for ethylene/norbornene copolymerization with high incorporation of norbornene, while the Me2Si-bridged complex 15 shows relatively low activity. Complex 9 shows the highest activity and the highest incorporation of norbornene among the complexes, but the molecular weight of the obtained polymer is relatively low.

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U2 - 10.1021/om049610o

DO - 10.1021/om049610o

M3 - Article

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SN - 0276-7333

VL - 23

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JO - Organometallics

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Syntheses of 2,5-dimethylcyclopentadienyl ansa-zirconocene complexes and their reactivity for ethylene/norbornene copolymerization

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