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Updated: Aug 5, 2026

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
Published on: September 18, 2016
Efficient Synthesis of N-Bridged Annulenes
Jianwei Liu1, Shiqing Huang2, Xiaoya Sun1
1School of Chemistry and Chemical Engineering, Chongqing University, Chongqing40044, China.
Researchers developed a novel copper-catalyzed reaction to synthesize N-bridged [10]annulene (NBA) frameworks, a class of nonbenzenoid aromatic molecules. These NBA compounds exhibit tunable fluorescence, expanding possibilities in organic materials and pharmaceuticals.
Area of Science:
- Organic Chemistry
- Materials Science
- Catalysis
Background:
- Benzenoid aromatic rings are common in pharmaceuticals and organic materials.
- Research on nonbenzenoid aromatic molecules is limited due to synthetic difficulties and angle strain.
Purpose of the Study:
- To develop an efficient synthetic route for nonbenzenoid aromatic molecules.
- To explore the properties and potential applications of N-bridged [10]annulene (NBA) frameworks.
Main Methods:
- A single-copper relay dual-catalyzed cascade sequence was employed.
- Copper-catalyzed 10π electrocyclization was a key step in the synthesis.
- Control experiments and density functional theory (DFT) calculations were used to elucidate the reaction mechanism.
Main Results:
- An unprecedented cascade sequence efficiently constructed NBA frameworks.
- The reaction demonstrated broad functional-group tolerance and applicability to 14π systems.
- The synthesized NBA compounds exhibited strong, tunable fluorescence across the full color spectrum.
Conclusions:
- The study presents a novel method for synthesizing nonbenzenoid aromatic compounds.
- The findings deepen the understanding of aromaticity in nonbenzenoid systems.
- Metal-catalyzed electrocyclization shows significant potential in synthetic chemistry for novel materials.
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