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Birch-Type Photoreduction of Arenes and Heteroarenes by Sensitized Electron Transfer
Anamitra Chatterjee1, Burkhard König1
1Universität Regensburg, Fakultät für Chemie und Pharmazie, 93040, Regensburg, Germany.
Abstract:
The direct reduction of arenes and heteroarenes by visible-light irradiation remains challenging, as the energy of a single photon is not sufficient for breaking aromatic stabilization. Shown herein is that the energy accumulation of two visible-light photons allows the dearomatization of arenes and heteroarenes. Mechanistic investigations confirm that the combination of energy-transfer and electron-transfer processes generates an arene radical anion, which is subsequently trapped by hydrogen-atom transfer and finally protonated to form the dearomatized product. The photoreduction converts planar aromatic feedstock compounds into molecular skeletons that are of use in organic synthesis.
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