Photolysis of pyran (I) under acidic conditions affords the hydrocarbon 1,2-diphenylacenaphthylene (II): this unusual photodehydration seems to involve the triplet state of (I) and does not occur in the absence of acid.
A. G. Schultz and R. H. Schlessinger, J. Chem. Soc. D, 1970, 1044 DOI: 10.1039/C29700001044
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