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Tröger's Base-Embedded Pillararenes─Macrocycles with Both Fixed and Conformational Chirality.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Pillararenes are macrocyclic compounds with potential applications in molecular recognition and sensing.
  • Chirality in macrocycles is crucial for enantioselective processes.
  • Tröger's base (TB) is a known chiral scaffold.

Purpose of the Study:

  • To synthesize novel Tröger's base-embedded pillararenes (P[1]TB[3]A).
  • To investigate the combined fixed and conformational chirality in these macrocycles.
  • To explore the potential of these compounds for chiral applications.

Main Methods:

  • Fragment-coupling macrocyclization strategy.
  • Synthesis of Tröger's base-embedded pillararenes (P[1]TB[3]A).
  • Analysis of conformational dynamics and chirality.

Main Results:

  • Successful preparation of Tröger's base-embedded pillararenes (P[1]TB[3]A).
  • Demonstration of a fixed chiral source from the TB unit.
  • Observation of reversible conformational chirality due to dynamic alkoxybenzene units.
  • Identification of a rare example of macrocycles with dual chirality.

Conclusions:

  • Tröger's base-embedded pillararenes (P[1]TB[3]A) exhibit both fixed and conformational chirality.
  • The dynamic nature of alkoxybenzene segments allows for reversible chirality.
  • These findings provide a foundation for developing new chiral pillararene architectures.