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Engineering Chiral Induction in Centrally Functionalized o-Phenylenes.

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Researchers developed a new method to control the folding handedness of aromatic foldamers by introducing chiral imides internally. Strategic surface functionalization significantly improved chiral induction, offering precise control over molecular structure.

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Area of Science:

  • Synthetic chemistry
  • Supramolecular chemistry
  • Materials science

Background:

  • Foldamers are synthetic oligomers mimicking biomacromolecules.
  • O-phenylenes are helical aromatic foldamers with simple structures.
  • Controlling foldamer handedness is crucial for precise structural control.

Purpose of the Study:

  • To explore internal chiral induction in o-phenylenes.
  • To develop methods for controlling o-phenylene twist sense.
  • To leave foldamer termini free for further functionalization.

Main Methods:

  • Synthesis of o-phenylenes with central chiral imides.
  • Conformational analysis using nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy.
  • Computational modeling using density functional theory (DFT).

Main Results:

  • Internal chiral induction in unfunctionalized o-phenylenes was generally poor.
  • Surface functionalization with trifluoromethyl or methyl groups enhanced chiral induction.
  • Increased diastereomeric excesses were observed with strategic functionalization.
  • Computational models confirmed steric effects as the primary driver of chiral induction.

Conclusions:

  • Internal chiral induction is achievable in o-phenylenes.
  • Strategic surface functionalization is key to improving chiral induction.
  • This method provides a new route to control foldamer structure and handedness.