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Updated: Jun 3, 2026

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes
Published on: December 16, 2019
Base-mediated intermolecular sp2 C-H bond arylation via benzyne intermediates
1Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
A new transition-metal-free method enables arylation of C-H bonds using aryl chlorides and fluorides. This efficient process generates aryne intermediates for selective coupling, advancing organic synthesis.
Area of Science:
- Organic Chemistry
- Synthetic Methodology
Background:
- Carbon-hydrogen (C-H) bond functionalization is crucial in organic synthesis.
- Developing transition-metal-free methods offers sustainable alternatives.
Purpose of the Study:
- To establish a novel, metal-free protocol for the arylation of heterocycle and arene C-H bonds.
- To utilize readily available aryl chlorides and fluorides as coupling partners.
Main Methods:
- Employing a transition-metal-free reaction system.
- Generating and reacting aryne intermediates.
- Investigating regioselectivity in C-H bond coupling.
Main Results:
- Successful arylation of heterocycle and arene C-H bonds was achieved.
- The method is effective with both aryl chlorides and fluorides.
- High regioselectivity was observed in the C-H bond coupling step.
Conclusions:
- A practical and efficient transition-metal-free arylation method has been developed.
- The protocol offers a sustainable approach to C-H functionalization.
- The use of aryne intermediates allows for controlled regioselective coupling.
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