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Benzene C-H Etherification via Photocatalytic Hydrogen-Evolution Cross-Coupling Reaction
Yi-Wen Zheng1,2, Pan Ye1, Bin Chen2
1Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University , Jinan 250100, PR China.
Organic Letters
|April 15, 2017
Summary
This study introduces a novel method for creating aryl ethers by directly coupling benzene C-H bonds with alcohol O-H bonds. This photocatalysis and cobalt catalysis approach offers a mild and efficient route to valuable chemical compounds.
Area of Science:
- Organic Chemistry
- Catalysis
- Photochemistry
Background:
- Aryl ethers are important structural motifs in pharmaceuticals and materials.
- Traditional methods for aryl ether synthesis often require harsh conditions or pre-functionalized starting materials.
Purpose of the Study:
- To develop a novel, efficient, and mild method for aryl ether synthesis.
- To achieve direct coupling of arene C-H bonds with alcohol O-H bonds.
Main Methods:
- Utilizing a dual catalyst system combining a photocatalyst (3-cyano-1-methylquinolinum) and a cobalt catalyst (cobaloxime).
- Employing photocatalysis and cobalt catalysis for synergistic C-H and O-H bond functionalization.
- Investigating intermolecular etherification of arenes and intramolecular alkoxylation reactions.
Main Results:
- Successful construction of aryl ethers via direct coupling with hydrogen evolution.
- Demonstrated intermolecular etherification of various arenes with alcohols.
- Achieved intramolecular alkoxylation of 3-phenylpropanols to form chromanes.
- Reactions proceed under remarkably mild conditions with hydrogen as the sole byproduct.
Conclusions:
- The developed dual catalytic system provides an efficient and sustainable method for aryl ether synthesis.
- This approach offers a greener alternative to existing synthetic routes, minimizing waste.
- The methodology is versatile, applicable to both intermolecular and intramolecular transformations.