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.
Keywords:
acridones; photo-oxidation; photocatalysis; thioxanthones; xanthones.
MeSH terms
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Acridones / chemical synthesis*
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Acridones / chemistry
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Acridones / radiation effects
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Light
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Metals / chemistry
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Oxidants, Photochemical / chemistry
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Oxidants, Photochemical / pharmacology
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Oxidation-Reduction / radiation effects
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Oxygen / chemistry*
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Thioxanthenes / chemical synthesis*
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Thioxanthenes / chemistry
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Thioxanthenes / radiation effects
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Xanthones / chemical synthesis*
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Xanthones / chemistry
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Xanthones / radiation effects
Substances
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Acridones
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Metals
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Oxidants, Photochemical
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Thioxanthenes
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Xanthones
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Oxygen