SCHEDULED MAINTENANCE
The red and the purple photochromic title compounds undergo intramolecular [4 + 4] photocycloaddition reactions on irradiation with white light to form pale yellow and colourless adducts, respectively, which undergo the reverse reactions thermally or on exposure to ultraviolet light.
H. G. Heller and M. J. Ottaway, J. Chem. Soc., Chem. Commun., 1995, 479 DOI: 10.1039/C39950000479
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