Irradiation of 2-hydroxyindan-1-ones generally results in α-cleavage, in which the intermediate may either recyclise or undergo intramolecular hydrogen transfer giving ring-opened ketoaldehydes; competition between these processes is sensitive to both substituent and solvent effects. When a 3-substituent is present which is a good leaving group, photolysis leads to isocoumarins and possible mechanistic paths for this last process are discussed.
N. K. Hamer, J. Chem. Soc., Perkin Trans. 1, 1979, 1285 DOI: 10.1039/P19790001285
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