The photochemical reaction of 1,8-diacetyl-naphthalene (1) involves an intramolecular proton migration from one acetyl group to the other followed by cyclization; that of the naphthopyran (6) results in the formation of dimethylacenaphthylene oxide (7).
K. Honda, A. Yabe and H. Tanaka, J. Chem. Soc., Chem. Commun., 1978, 589 DOI: 10.1039/C39780000589
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