Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 15, Pages 4697-4700Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201600405
Keywords
aerobic oxidation; photoredox catalysis; redox meditor; sulfoxides; visible light
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Funding
- Singapore National Research Foundation (CREATE Programme of Nanomaterials for Energy and Water Management and Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE))
- MOE Tier 1 [RG130/14]
- National Natural Science Foundation of China [21503086]
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TiO2 photoredox catalysis has recently attracted much interest for use in performing challenging organic transformations under mild reaction conditions. However, the reaction scheme is hampered by the fact that TiO2 can only be excited by UV light of wavelengths shorter than 385nm. One promising strategy to overcome this issue is to anchor an organic, preferably metal-free dye onto the surface of TiO2. Importantly, we observed that the introduction of a catalytic amount of the redox mediator TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl] ensured the stability of the anchored dye, alizarin redS, thereby resulting in the selective oxidation of organic sulfides with O-2. This result affirms the essential role of the redox mediator in enabling the organic transformations by visible-light photoredox catalysis.
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