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Aromaticity in Fully π-Conjugated Multicyclic Macrocycles
Longbin Ren1, Yi Han1, Xudong Hou1
1Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore.
Researchers synthesized novel multicyclic macrocycles (MMCs) by fusing thiophene rings. These MMCs exhibit unique electronic properties and complex aromaticity due to electronic coupling between fused rings.
Area of Science:
- Organic Chemistry
- Materials Science
- Theoretical Chemistry
Background:
- Aromaticity research traditionally focuses on monocyclic and polycyclic aromatic hydrocarbons.
- Fully π-conjugated multicyclic macrocycles (MMCs) offer unique electronic structures due to inter-ring electronic coupling.
- Studies on MMCs are limited due to synthetic challenges.
Purpose of the Study:
- To report the facile synthesis of novel fully π-conjugated MMCs.
- To investigate the interplay between constitutional macrocycles in MMCs.
- To explore the unique aromaticity and electronic properties of MMCs.
Main Methods:
- Intramolecular and intermolecular Yamamoto coupling reactions were employed for synthesis.
- A precursor (7) was designed for efficient MMC construction.
- Monocyclic macrocycle (1TMC) synthesized as a reference compound.
Main Results:
- Two MMCs (2TMC and 3TMC) and a monocyclic analogue (1TMC) were successfully synthesized.
- X-ray crystallographic analysis, NMR, and theoretical calculations were performed.
- Unique aromatic/antiaromatic character was observed due to macrocycle interplay.
Conclusions:
- The study demonstrates a facile synthetic route to MMCs.
- Interplay between constitutional macrocycles significantly influences electronic properties and aromaticity.
- New insights into complex aromaticity in MMC systems were provided.
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