Application of Visible‐to‐UV Photon Upconversion to Photoredox Catalysis: The Activation of Aryl Bromides |
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| Authors: | Michal Majek Uwe Faltermeier Prof Dr Bernhard Dick Dr Raúl Pérez‐Ruiz Prof Dr Axel Jacobi von Wangelin |
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| Institution: | 1. Institute of Organic Chemistry, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg (Germany);2. Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg (Germany) |
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| Abstract: | The activation of aryl–Br bonds was achieved by sequential combination of a triplet–triplet annihilation process of the organic dyes, butane‐2,3‐dione and 2,5‐diphenyloxazole, with a single‐electron‐transfer activation of aryl bromides. The photophysical and chemical steps were studied by time‐resolved transient fluorescence and absorption spectroscopy with a pulsed laser, quenching experiments, and DFT calculations. |
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| Keywords: | aryl halides defunctionalization organocatalysis photocatalysis triplet states two‐photon process |
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