Abstract

AbstractRaab's biochemically active species, derived from dithranol (1), is the anion 1a (Sect. A), which is a photosensitizer. Its sensitizing potency is quantitatively compared with that of rose bengal, tetraphenylporphyrine and other sensitizers (Sect. B). In Sect. C the mechanism of the conversion of 1a with 1Δg18O2 to chrysazin (2) is elucidated.

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