Synthesis of [2,2′-methylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride and its reactivity in ethylene-norbornene copolymerization

Bun Yeoul Lee, Young Heui Kim, Young Chul Won, Jin Wook Han, Won Hyuk Suh, In Su Lee, Young Keun Chung, Kwang Ho Song

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

An ansa-zirconocene compound, [2,2′-meth-ylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride (5), bearing methyl substituents on the carbons adjacent to a bridgehead carbon, was synthesized by key steps of the catalytic Pauson-Khand reaction and the retro-Diels-Aider reaction. The crystal structure of 5 was determined. The small angle (117.15°) between the two centroids of the cyclopentadienyls and a zirconium atom and the absence of any substituents on the positions β with respect to the bridgehead carbon indicate that the coordination site for catalysis is widely opened. Compound 5, when activated with MAO, showed good performance for copolymerization of ethylene with a bulky monomer such as norbornene. The activity and norbornene incorporation ability are much better than those of [Ph2C(Fluo)(Cp)]ZrCl2.

Original languageEnglish
Pages (from-to)1500-1503
Number of pages4
JournalOrganometallics
Volume21
Issue number7
DOIs
Publication statusPublished - 2002 Apr 1
Externally publishedYes

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dichlorides
copolymerization
Copolymerization
ethylene
Carbon
reactivity
carbon
Bearings (structural)
synthesis
Monoamine Oxidase
centroids
Catalysis
catalysis
monomers
Monomers
Crystal structure
Atoms
crystal structure
atoms
2-norbornene

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry

Cite this

Synthesis of [2,2′-methylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride and its reactivity in ethylene-norbornene copolymerization. / Lee, Bun Yeoul; Kim, Young Heui; Won, Young Chul; Han, Jin Wook; Suh, Won Hyuk; Lee, In Su; Chung, Young Keun; Song, Kwang Ho.

In: Organometallics, Vol. 21, No. 7, 01.04.2002, p. 1500-1503.

Research output: Contribution to journalArticle

Lee, Bun Yeoul ; Kim, Young Heui ; Won, Young Chul ; Han, Jin Wook ; Suh, Won Hyuk ; Lee, In Su ; Chung, Young Keun ; Song, Kwang Ho. / Synthesis of [2,2′-methylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride and its reactivity in ethylene-norbornene copolymerization. In: Organometallics. 2002 ; Vol. 21, No. 7. pp. 1500-1503.
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abstract = "An ansa-zirconocene compound, [2,2′-meth-ylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride (5), bearing methyl substituents on the carbons adjacent to a bridgehead carbon, was synthesized by key steps of the catalytic Pauson-Khand reaction and the retro-Diels-Aider reaction. The crystal structure of 5 was determined. The small angle (117.15°) between the two centroids of the cyclopentadienyls and a zirconium atom and the absence of any substituents on the positions β with respect to the bridgehead carbon indicate that the coordination site for catalysis is widely opened. Compound 5, when activated with MAO, showed good performance for copolymerization of ethylene with a bulky monomer such as norbornene. The activity and norbornene incorporation ability are much better than those of [Ph2C(Fluo)(Cp)]ZrCl2.",
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T1 - Synthesis of [2,2′-methylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride and its reactivity in ethylene-norbornene copolymerization

AU - Lee, Bun Yeoul

AU - Kim, Young Heui

AU - Won, Young Chul

AU - Han, Jin Wook

AU - Suh, Won Hyuk

AU - Lee, In Su

AU - Chung, Young Keun

AU - Song, Kwang Ho

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N2 - An ansa-zirconocene compound, [2,2′-meth-ylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride (5), bearing methyl substituents on the carbons adjacent to a bridgehead carbon, was synthesized by key steps of the catalytic Pauson-Khand reaction and the retro-Diels-Aider reaction. The crystal structure of 5 was determined. The small angle (117.15°) between the two centroids of the cyclopentadienyls and a zirconium atom and the absence of any substituents on the positions β with respect to the bridgehead carbon indicate that the coordination site for catalysis is widely opened. Compound 5, when activated with MAO, showed good performance for copolymerization of ethylene with a bulky monomer such as norbornene. The activity and norbornene incorporation ability are much better than those of [Ph2C(Fluo)(Cp)]ZrCl2.

AB - An ansa-zirconocene compound, [2,2′-meth-ylenebis(1,3-dimethylcyclopentadienyl)]zirconium dichloride (5), bearing methyl substituents on the carbons adjacent to a bridgehead carbon, was synthesized by key steps of the catalytic Pauson-Khand reaction and the retro-Diels-Aider reaction. The crystal structure of 5 was determined. The small angle (117.15°) between the two centroids of the cyclopentadienyls and a zirconium atom and the absence of any substituents on the positions β with respect to the bridgehead carbon indicate that the coordination site for catalysis is widely opened. Compound 5, when activated with MAO, showed good performance for copolymerization of ethylene with a bulky monomer such as norbornene. The activity and norbornene incorporation ability are much better than those of [Ph2C(Fluo)(Cp)]ZrCl2.

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