Synthesis of a π-Extended Azacorannulenophane Enabled by Strain-Induced 1,3-Dipolar Cycloaddition
Xinjiang Zhang1, Marc R Mackinnon2, Graham J Bodwell2
1Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
Researchers synthesized a novel cyclophane with a nitrogen-containing buckybowl using cycloaddition and palladium catalysis. This π-extended azacorannulenophane displays unique structural and electronic properties due to its curved polycyclic aromatic system.
Area of Science:
- Organic Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Cyclophanes and buckybowls are important molecular architectures.
- Nitrogen-containing analogues offer unique electronic and structural properties.
- Controlled synthesis of complex polycyclic aromatic systems remains a challenge.
Purpose of the Study:
- To synthesize the first cyclophane bearing a nitrogen-containing buckybowl.
- To investigate the structural and physical properties of the novel molecule.
- To understand the impact of π-extension and curvature on molecular characteristics.
Main Methods:
- Sequential 1,3-dipolar cycloaddition reaction.
- Palladium-catalyzed intramolecular cyclization.
- Synthesis of a polycyclic aromatic azomethine ylide and [7](2,7)pyrenophane.
Main Results:
- Successful synthesis of a π-extended azacorannulenophane.
- Observed unique variations in bowl depth.
- Measured extraordinarily high-field 1H NMR chemical shifts.
- Decreased HOMO-LUMO gap and red-shifted absorption/emission spectra.
Conclusions:
- The novel cyclophane represents a significant advancement in buckybowl chemistry.
- The observed properties are attributed to π-extension and enforced curvature.
- This work opens avenues for designing new functional organic materials.
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