Direct Benzylic C-H Functionalization with Fluorenones under Visible-Light Irradiation
Xi Zhao1, Xiaofeng Yu1, Mingjun Liu1
1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China.
A new photocatalyst-free method enables benzylic C-H functionalization using fluorenones and visible light. This efficient synthesis yields 9-benzylated fluorenols with high atom economy under mild conditions.
Area of Science:
- Organic Chemistry
- Photochemistry
- Synthetic Methodology
Background:
- Benzylic C-H functionalization is crucial for synthesizing complex organic molecules.
- Developing photocatalyst-free methods under visible light offers greener and more efficient synthetic routes.
Purpose of the Study:
- To achieve an external photocatalyst-free benzylic C-H functionalization using fluorenones and visible light.
- To develop an efficient synthetic approach for 9-benzylated fluorenols.
Main Methods:
- Visible-light irradiation of fluorenones with toluene derivatives.
- Spectroscopic studies to elucidate the reaction mechanism.
Main Results:
- Successful photocatalyst-free benzylic C-H functionalization.
- High yields (≤91%) of 9-benzylated fluorenols achieved.
- Demonstrated 100% atom economy under mild conditions.
Conclusions:
- The developed method provides an efficient and atom-economical route to 9-benzylated fluorenols.
- The reaction proceeds via reductive quenching and cross-coupling of ketyl and benzyl radicals.
More Related Videos
06:34Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
Published on: June 20, 2014
09:12[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Related Concept Videos
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Reactions at the Benzylic Position: Halogenation
Nucleophilic Aromatic Substitution: Elimination–Addition
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
Reactions at the Benzylic Position: Oxidation and Reduction
Benzene to Phenol via Cumene: Hock Process
