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Activation of

Williams1, Dai, Li

  • 1Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4 (Canada).

Angewandte Chemie (International Ed. in English)
|January 29, 2000
PubMed
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Perfluorinated diborane 1 facilitates reversible C(6)F(5) transfer with zirconium complexes. This behavior influences ethylene polymerization, differing from related boron compounds.

Area of Science:

  • Organometallic Chemistry
  • Boron Chemistry
  • Polymerization Catalysis

Background:

  • Zirconium complexes are key in olefin polymerization.
  • Perfluorinated boron compounds are explored as activators and Lewis acids.
  • Understanding activator-metallocene interactions is crucial for catalyst design.

Purpose of the Study:

  • To investigate the reversible C(6)F(5) transfer from a perfluorinated diborane to zirconium complexes.
  • To correlate the solution chemistry of resulting ion pairs with ethylene polymerization activity.
  • To compare the performance of the diborane activator with related boron compounds.

Main Methods:

  • Methide abstraction from zirconium precursors using perfluorinated diborane 1.
  • Formation and characterization of metallocenium ion pairs.

Related Experiment Videos

  • Ethylene polymerization studies using diborane 1 and related boron compounds as activators.

    • Main Results:

    • Demonstrated reversible C(6)F(5) transfer between boron centers and zirconium.
    • Established a correlation between ion pair solution chemistry and polymerization behavior.
    • Diborane 1 exhibited distinct polymerization activity compared to B(C(6)F(5))(3) and other polycyclic boron compounds.

    Conclusions:

    • The reversible C(6)F(5) transfer mechanism is key to the activity of diborane 1 in polymerization.
    • The structure of the boron activator significantly impacts catalyst performance.
    • This study provides insights into activator design for olefin polymerization.