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Related Experiment Videos

Exploring CH-activation pathways in bifunctional zirconocene/borane systems.

Michael Hill1, Gerhard Erker, Gerald Kehr

  • 1Contribution from the Organisch-Chemisches Institut Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany.

Journal of the American Chemical Society
|September 2, 2004
PubMed
Summary
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This study synthesizes novel bifunctional zirconocene/borane complexes. These complexes undergo unique intramolecular reactions, forming zwitterionic and aryne structures, expanding organometallic chemistry.

Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Synthetic Chemistry

Background:

  • Ansa-zirconocene complexes are versatile metallocenes with applications in catalysis.
  • Borane complexes offer unique reactivity due to their electrophilic nature.
  • Combining these functionalities in one molecule presents synthetic challenges and opportunities.

Purpose of the Study:

  • To synthesize novel bifunctional zirconocene/borane complexes.
  • To explore the reactivity of these complexes, including intramolecular reactions and ligand exchange.
  • To characterize new organometallic structures.

Main Methods:

  • Hydroboration of vinyl-substituted ansa-zirconocene dichloride with HB(C6F5)2.
  • Protection of borane moiety with benzimidazoles.

Related Experiment Videos

  • Ligand exchange reactions at the zirconium center using alkyllithium reagents.
  • Thermolysis of complexes to induce intramolecular reactions.
  • X-ray diffraction for structural characterization.

    • Main Results:

    • Synthesis of bifunctional zirconocene/borane complex 2.
    • Successful introduction of protective groups and subsequent ligand exchange at zirconium.
    • Formation of zwitterionic complex 14 via intramolecular electrophilic attack and deprotonation.
    • Characterization of complex 14 by X-ray diffraction.
    • Formation of (aryne)zirconocene complex 18 and sigma-N-methylbenzimidazolyl zirconium complex 20.

    Conclusions:

    • Novel synthetic routes to bifunctional zirconocene/borane complexes were established.
    • Intramolecular reactions lead to unique zwitterionic and aryne-containing metallocene frameworks.
    • The reactivity is influenced by ligand protection and reaction conditions, offering pathways to diverse organometallic structures.