Summary
The ultraviolet irradiation of air-saturated alcoholic solutions of 3-acetyl-3,4-dihydrocoumarin (1) leads to the formation of 3-acetylcoumarin (2) and 3,3′-diacetyl-3,3′,4,4′-tetrahydro-4,4′-biscoumarin (3). The presence of molecular oxygen is an indispensable condition for the occurrence of a photodehydrogenation process, which is quantitatively when effected on silica gel.
Zusammenfassung
Bei UV-Bestrahlung von alkoholischen Lösungen von 3-Acetyl-3,4-dihydrocumarin (1) unter O2 werden 3-Acetylcumarin (2) und 3,3′-Diacetyl-3,3′,4,4′-biscumarin (3) gebildet. Die Anwesenheit von molekularem O2 ist für die Photodehydrierung erforderlich, wobei die Umsetzung an Silikagel quantitativ verläuft.
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Petkov, I., Bojilova, A. & Markov, P. Photochemical dehydrogenation of 3-acetyl-3,4-dihydrocoumarin. Monatsh Chem 121, 85–87 (1990). https://doi.org/10.1007/BF00810299
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DOI: https://doi.org/10.1007/BF00810299