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Homochiral Self-Sorting During Macrocycle Formation and their Chiroptical Properties
1School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), 695551, Thiruvananthapuram, India.
Chemistryopen
|November 27, 2024
Summary
Chiral aldehydes formed homochiral macrocycles with aromatic amines, unlike aliphatic amines. This self-sorting enhanced chiroptical properties, showing red-shifted Cotton effects and increased specific rotation.
Area of Science:
- Supramolecular Chemistry
- Organic Synthesis
- Chiroptical Spectroscopy
Background:
- Chiral self-sorting is crucial for creating complex molecular architectures.
- BINOL-derived aldehydes offer a promising scaffold for investigating chiral recognition.
- Macrocycle formation is sensitive to the nature of amine guests.
Purpose of the Study:
- To synthesize BINOL-derived C2-symmetric aldehydes.
- To investigate chiral self-sorting phenomena during macrocycle formation with different bisamines.
- To analyze the impact of macrocyclization on chiroptical properties.
Main Methods:
- Synthesis of BINOL-derived C2-symmetric aldehydes.
- Macrocycle formation reactions with aliphatic and aromatic bisamines.
- 1H NMR analysis for self-sorting confirmation.
- Molecular modeling studies.
- Chiroptical property analysis (Cotton effects, specific rotation).
Main Results:
- Complete homochiral self-sorting was achieved with aromatic bisamines, confirmed by 1H NMR and molecular modeling.
- Self-sorting was unsuccessful with aliphatic bisamines.
- Macrocyclization with aromatic amines resulted in a red-shift of Cotton effects due to extended conjugation.
- A significant increase in specific rotation was observed upon macrocycle formation.
Conclusions:
- Aromatic amines promote complete homochiral self-sorting in BINOL-derived aldehyde macrocyclization.
- Macrocyclization significantly alters and enhances the chiroptical properties of the resulting molecules.
- The study highlights the potential of BINOL scaffolds in chiral supramolecular chemistry.
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