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Template-directed olefin cross metathesis.

Stuart J Cantrill1, Robert H Grubbs, Daniela Lanari

  • 1California NanoSystems Institute & Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095, USA.

Organic Letters
|September 9, 2005
PubMed
Summary
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A novel template enhances olefin cross metatheses reactions. This supramolecular approach improves reaction rates and dimer yields for both monoolefin and diolefin monomers using ruthenium catalysts.

Area of Science:

  • Supramolecular Chemistry
  • Organometallic Chemistry
  • Polymer Chemistry

Background:

  • Olefin cross metathesis is a vital reaction in organic synthesis and polymer chemistry.
  • Ruthenium-alkylidene catalysts are widely used for olefin metathesis reactions.
  • Controlling selectivity and enhancing reaction efficiency in metathesis remains a challenge.

Purpose of the Study:

  • To investigate the use of a novel supramolecular template to promote olefin cross metatheses.
  • To evaluate the impact of the template on reaction rates and product yields.
  • To explore the template's effectiveness with both monoolefin and diolefin monomers.

Main Methods:

  • A template featuring two secondary dialkylammonium ion recognition sites was synthesized.

Related Experiment Videos

  • Dibenzo[24]crown-8 derivatives were used to encircle the template.
  • Ruthenium-alkylidene catalysts were employed to catalyze olefin cross metatheses reactions in the presence of the template.

    • Main Results:

    • The template significantly amplified the rates of metathesis for monoolefin monomers.
    • Dimer yields were enhanced for both monoolefin and diolefin monomers in the presence of the template.
    • The template facilitated selective dimer formation for diolefins, suppressing higher oligomer formation.

    Conclusions:

    • Supramolecular templating is an effective strategy to enhance olefin cross metatheses reactions.
    • The designed template improves catalytic efficiency and product selectivity in ruthenium-catalyzed metathesis.
    • This approach offers a promising route for controlled synthesis of olefinic compounds and polymers.