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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Photooxidizing chromium catalysts for promoting radical cation cycloadditions
Susan M Stevenson1, Matthew P Shores2, Eric M Ferreira3
1Department of Chemistry, University of Georgia, Athens, GA 30602 (USA).
Selected chromium(III) complexes act as photocatalysts, initiating radical cation cycloadditions by oxidizing electron-rich alkenes. These novel metal catalysts offer unique reactivity in photoredox reactions, expanding beyond traditional ruthenium and iridium systems.
Area of Science:
- Photochemistry
- Organometallic Chemistry
- Organic Synthesis
Background:
- Photoredox catalysis is a rapidly growing field in organic synthesis.
- Ruthenium and iridium complexes are commonly used photocatalysts.
- Exploring new metal complexes can lead to novel reactivity and catalytic pathways.
Purpose of the Study:
- To investigate the photooxidizing capabilities of chromium(III) complexes.
- To demonstrate their utility in promoting radical cation cycloaddition reactions.
- To expand the range of catalysts available for photoredox catalysis.
Main Methods:
- Synthesis and characterization of selected chromium(III) complexes.
- Photochemical oxidation of electron-rich alkenes using these complexes.
- Analysis of reaction mechanisms and products to confirm [4+2] cycloaddition initiation.
Main Results:
- Chromium(III) complexes exhibit sufficient excited-state lifetimes for photooxidation.
- These complexes successfully initiated radical cation cycloaddition reactions.
- The observed reactivity differs from that of standard ruthenium and iridium catalysts.
Conclusions:
- Chromium(III) complexes are effective photocatalysts for radical cation cycloadditions.
- These complexes offer unique properties and reactivity profiles in photoredox catalysis.
- They represent a valuable addition to the toolkit of photoredox catalysts.
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