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Related Experiment Videos

PS-COD and PS-9-BBN: polymer-supported reagents for solution-phase parallel synthesis.

Jefferson D Revell1, Barbara Dörner, Peter D White

  • 1Combinatorial Centre for Excellence, School of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom.

Organic Letters
|February 25, 2005
PubMed
Summary

Researchers immobilized 1,5-cyclooctadiene onto Merrifield resin, creating a polymer useful as a halogen scavenger. Hydroboration of this supported cyclooctadiene yielded a 9-BBN analogue with similar regioselectivity in olefin hydroboration.

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Area of Science:

  • Polymer Chemistry
  • Organometallic Chemistry
  • Organic Synthesis

Background:

  • Immobilization of organic molecules on solid supports is crucial for developing reusable reagents and catalysts.
  • 1,5-Cyclooctadiene is a versatile ligand and precursor in organometallic chemistry.
  • 9-Borabicyclo[3.3.1]nonane (9-BBN) is a widely used hydroboration reagent known for its regioselectivity.

Purpose of the Study:

  • To develop a method for immobilizing 1,5-cyclooctadiene on a solid support.
  • To evaluate the utility of the immobilized cyclooctadiene as a halogen scavenger.
  • To synthesize and characterize a supported 9-BBN analogue and assess its hydroboration activity.

Main Methods:

  • Deprotonation of 1,5-cyclooctadiene using lithium-potassium-intercalated graphite (LICKOR) conditions.

Related Experiment Videos

  • Reaction of the deprotonated cyclooctadiene with Merrifield resin for immobilization.
  • Hydroboration of the immobilized cyclooctadiene to form a supported 9-BBN analogue.
  • Testing the supported 9-BBN analogue in olefin hydroboration reactions.

    • Main Results:

    • Successful immobilization of 1,5-cyclooctadiene on Merrifield resin in high yield.
    • The resulting polymer demonstrated effectiveness as a halogen scavenger.
    • Hydroboration of the immobilized cyclooctadiene yielded a supported 9-BBN analogue.
    • The supported 9-BBN analogue exhibited comparable regioselectivity to free 9-BBN in olefin hydroboration.

    Conclusions:

    • A novel method for preparing immobilized 1,5-cyclooctadiene was established.
    • The immobilized cyclooctadiene serves as an efficient halogen scavenger.
    • A supported 9-BBN analogue was synthesized, offering potential for reusable hydroboration catalysis with retained regioselectivity.