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Updated: Apr 21, 2026

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes
Published on: December 16, 2019
Non-alternant non-benzenoid aromatic compounds: past, present, and future
1Division of Frontier Materials Sciences, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan. tobe@chem.es.osaka-u.ac.jp.
This review explores non-alternant, non-benzenoid hydrocarbons, focusing on indenofluorenes for optoelectronics. Future molecules involve extended indenofluorene arrays, highlighting advancements in aromatic compound chemistry.
Area of Science:
- Organic Chemistry
- Materials Science
Background:
- Review of non-alternant, non-benzenoid hydrocarbons.
- Historical context from the International Symposium on Novel Aromatic Compounds (ISNA).
- Classic examples: pentalene, azulene, heptalene.
Purpose of the Study:
- To review the development of non-alternant, non-benzenoid hydrocarbon chemistry.
- To highlight the significance of indenofluorene isomers in optoelectronics.
- To propose future molecular designs based on extended indenofluorene motifs.
Main Methods:
- Literature review and synthesis of historical and current research.
- Discussion of structural integration through benzannelation and benzinterposition.
- Analysis of specific properties of indeno[2,1-b]fluorene.
Main Results:
- Indacenes and indenofluorenes represent key developments in this field.
- Indenofluorene isomers show promise for optoelectronic applications.
- Benzannelation significantly influences molecular properties beyond stabilization.
Conclusions:
- The chemistry of non-alternant, non-benzenoid hydrocarbons has evolved significantly.
- Indenofluorenes are crucial for current optoelectronic research.
- Further extensions of indenofluorene structures offer exciting future possibilities.
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