Cycloparaphenylenes via [2+2+2] cycloaddition.
Daniel Kohrs1,2, Jannis Volkmann1,2, Hermann A Wegner1,2
1Institute of Organic Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany. Hermann.A.Wegner@org.Chemie.uni-giessen.de.
The [2+2+2] cycloaddition is a versatile method for creating substituted aromatic rings. This review explores its use in synthesizing cycloparaphenylenes, detailing strategies and their advantages.
Area of Science:
- Organic Chemistry
- Supramolecular Chemistry
Background:
- The [2+2+2] cycloaddition (CA) is an atom-economic reaction for forming substituted aromatic rings.
- Cycloparaphenylenes (CPPs) are important molecular architectures with unique properties.
Purpose of the Study:
- To highlight the application of the [2+2+2] CA in synthetic strategies for substituted CPPs.
- To categorize and analyze different synthetic approaches based on the role of the [2+2+2] CA.
Main Methods:
- Review of synthetic methodologies employing [2+2+2] cycloaddition for CPP synthesis.
- Categorization of strategies into four classes based on the CA's function (aromatization, macrocyclization, or both).
Main Results:
- The [2+2+2] CA can be strategically employed at different stages of CPP synthesis.
- Analysis of the benefits and drawbacks associated with each synthetic strategy.
Conclusions:
- The [2+2+2] CA is a powerful tool for constructing substituted CPPs.
- Understanding the different strategic roles of the CA facilitates efficient synthesis design.
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