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Polyphenyl macrocyclic oligophenylenes.

Qiuling Song1, Christopher W Lebeis, Xianfeng Shen

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

Journal of the American Chemical Society
|September 30, 2005
PubMed
Summary
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Researchers synthesized novel hexaphenylbenzene macrocycles via Diels-Alder reactions and palladium-catalyzed coupling. Structural analysis revealed specific conformations and porous crystalline packing, leading to improved synthetic methods for these complex molecules.

Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Diels-Alder reactions and palladium-catalyzed coupling are key methods for constructing complex organic molecules.
  • Hexaphenylbenzene derivatives are of interest for their unique structural and electronic properties.
  • Synthesis of large macrocyclic structures often presents challenges in yield and purification.

Purpose of the Study:

  • To synthesize and characterize novel hexaphenylbenzene-based macrocycles.
  • To investigate the conformational preferences and solid-state packing of these macrocycles.
  • To develop more efficient and selective synthetic routes for obtaining pure macrocyclic products.

Main Methods:

  • Diels-Alder reaction between tribenzohexadehydro[12]annulene and a substituted cyclopentadienone.

Related Experiment Videos

  • Palladium-catalyzed coupling of aryl halides and boronic acids to form oligomeric and macrocyclic structures.
  • Nuclear Magnetic Resonance (NMR) spectroscopy and X-ray crystallography for structural elucidation.
  • Computational studies to assess conformational dynamics.

    • Main Results:

    • A triple Diels-Alder adduct, hexaphenylhexa-o-phenylene (6b), was synthesized and shown to adopt a screw conformation.
    • Palladium-catalyzed coupling yielded a mixture of linear and cyclic hexaphenylbenzene oligomers, including a macrocyclic tetramer ('supertetraphenylene' 7).
    • Supertetraphenylene 7 possesses a large central cavity and forms porous crystalline structures.
    • Initial purification challenges for 7 prompted the development of more selective synthetic strategies.

    Conclusions:

    • The study successfully synthesized and characterized complex hexaphenylbenzene macrocycles with distinct conformational and packing properties.
    • The development of improved synthetic methods facilitates easier access to pure macrocyclic compounds.
    • These findings contribute to the understanding of large aromatic systems and porous materials.