Abstract
9H-Xanthenes, 9H-thioxanthenes and 9,10-dihydroacridines can be easily oxidized to the corresponding xanthones, thioxanthones and acridones, respectively, by a simple photo-oxidation procedure carried out using molecular oxygen as oxidant under the irradiation of visible blue light and in the presence of riboflavin tetraacetate as a metal-free photocatalyst. The obtained yields are high or quantitative.
Highlights
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We report a very simple and environmentally benign preparation of xanthones, thioxanthones and acridones carried out by irradiation of 9H-xanthenes, 9H-thioxanthenes and 9,10-dihydroacridines, respectively, with visible blue light in the presence of oxygen and using a low-costing metal-free photocatalyst
We explored if a metal-containing photocatalyst could be used, employing the very known visible lightabsorbing complex Ru(bpy)3 Cl2 (8) (Figure 1) [12,55,56], its performance resulted very poor under these conditions (Table 1, entry 8)
Summary
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