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Related Experiment Videos

Polyyne synthesis using carbene/carbenoid rearrangements.

Wesley A Chalifoux1, Rik R Tykwinski

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.

Chemical Record (New York, N.Y.)
|August 12, 2006
PubMed
Summary

The Fritsch-Buttenberg-Wiechell (FBW) rearrangement efficiently synthesizes polyynes and carbon-rich materials. Solvent choice is critical for FBW success, with nonpolar solvents yielding optimal results for creating these conjugated organic structures.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • The Fritsch-Buttenberg-Wiechell (FBW) rearrangement is a key reaction for synthesizing polyynes.
  • Highly conjugated organic materials and polyyne frameworks are crucial for advanced applications.
  • Developing efficient synthetic routes for polyynes is an ongoing challenge in organic chemistry.

Purpose of the Study:

  • To develop and optimize the Fritsch-Buttenberg-Wiechell (FBW) rearrangement for polyyne synthesis.
  • To investigate the influence of reaction conditions, particularly solvents, on FBW rearrangement efficiency.
  • To explore the application of FBW rearrangement in constructing complex carbon-rich molecules and evaluating their properties.

Main Methods:

  • Synthesis of alkynyl ketone precursors followed by Corey-Fuchs dibromoolefination.

Related Experiment Videos

  • Carbenoid rearrangement induced by butyllithium (BuLi) treatment of dibromoolefins in various solvents.
  • Characterization of synthesized polyynes, including di-, tri-, and tetraynes, and two-dimensional carbon-rich structures.
  • Evaluation of third-order nonlinear optical properties of the synthesized polyynes.

    • Main Results:

    • The FBW rearrangement was successfully applied to synthesize a range of silyl, alkyl, alkenyl, and aryl polyynes.
    • Reaction success was highly solvent-dependent, with nonpolar hydrocarbon solvents (hexanes, toluene, benzene) outperforming ethereal solvents (diethyl ether, THF).
    • The study demonstrated the synthesis of polyynes up to the decayne stage and the construction of 2D carbon-rich molecules.
    • Third-order nonlinear optical properties were evaluated, showing a significant increase in molecular second hyperpolarizabilities with polyyne length.

    Conclusions:

    • The FBW rearrangement provides a versatile and effective method for constructing polyynes and conjugated organic materials.
    • Optimized solvent selection is crucial for maximizing the yield and efficiency of the FBW rearrangement.
    • Synthesized polyynes exhibit promising nonlinear optical properties, with performance scaling favorably with molecular length compared to other nonaromatic organic oligomers.