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Off-center oxygen-arene interactions in solution: a quantitative study.

Benjamin W Gung1, Xiaowen Xue, Hans J Reich

  • 1Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, USA. gungbw@muohio.edu

The Journal of Organic Chemistry
|August 27, 2005
PubMed
Summary
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Researchers explored lone pair-arene interactions in triptycenes using NMR spectroscopy. They found most compounds exhibit attractive interactions, with one notable exception showing slight repulsion.

Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Spectroscopy

Background:

  • Triptycenes are rigid molecular scaffolds with unique three-dimensional structures.
  • Lone pair-arene interactions play a crucial role in molecular recognition and self-assembly.
  • Understanding these interactions is key to designing novel functional molecules.

Purpose of the Study:

  • To synthesize and characterize novel triptycene derivatives.
  • To investigate the nature and magnitude of lone pair-arene interactions in off-center configurations.
  • To quantify the free energies associated with these interactions.

Main Methods:

  • Synthesis of triptycene derivatives with varying substituents at C1 and C9 positions.
  • Low-temperature Nuclear Magnetic Resonance (NMR) spectroscopy to determine conformational ratios (syn/anti).

Related Experiment Videos

  • Calculation of free energies of interaction from syn/anti ratios.

    • Main Results:

    • Triptycenes with C1-methoxy (MeO) or ester (RCOO) groups and C9-benzyl substituents were successfully prepared.
    • Conformational analysis revealed syn and anti isomers, with the syn isomer facilitating lone pair-arene interaction.
    • One ester derivative (Compound 7) exhibited a slight repulsive interaction (0.08 kcal/mol), while a methoxy derivative (Compound 2e) showed significant attraction (-0.47 ± 0.05 kcal/mol).

    Conclusions:

    • The study quantifies lone pair-arene interactions in a series of triptycene derivatives.
    • The findings highlight the subtle balance between attractive and repulsive forces in molecular interactions.
    • Triptycene scaffolds provide a versatile platform for probing non-covalent interactions.