Self-sensitised and Methylene Blue- or Rose Bengal-sensitised photo-oxidation of 2-(2-quinolyl)indane-1,3-dione (1) in solution gives phthalic acid, quinoline-2-carbaldehyde, and quinoline-2-carboxylic acid, via the reaction of singlet oxygen with (1).
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Kuramoto et al. (1979) studied this question.