AI Article Synopsis
- Developing sustainable photocatalytic bromination methods using bromo sources is a growing area of interest but needs further improvement.
- Key to this process is the effective use of photocatalyst redox centers for generating bromine species.
- The study introduces a novel approach using a supported photocatalyst (PTCDA on AlO) which utilizes oxygen reduction to produce reactive species that facilitate the bromination of arenes.
Article Abstract
Developing mild photocatalytic bromination strategies using sustainable bromo source has been attracting intense interests, but there is still much room for improvement. Full utilization of redox centers of photocatalysts for efficient generation of Br species is the key. Herein we report heterogenous organophotocatalytic HBr oxidation coupled with oxygen reduction to furnish Br and HO for effective bromination of arenes over AlO supported perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA). Mechanism studies suggest that O-vacancy in AlO can provide Lewis-acid-type anchoring sites for O, enabling unexpected dual-electron transfer from anchored photoexcited PTCDA to chemically bound O to produce HO. The in-situ generated HO and Br over redox centers work together to generate HBrO for bromination of arenes. This work provides new insights that heterogenization of organophotocatalysts can not only help to improve their stability and recyclability, but also endow them with the ability to trigger unusual reaction mode via cooperative catalysis with supports.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11150450 | PMC |
| http://dx.doi.org/10.1038/s41467-024-48349-3 | DOI Listing |
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