U.v. irradiation of 4-ethyl-2,6-dimethylpyrylium perchlorate in water gives 2-ethyl-4-methyl-5-oxohex-2-enal (8) and syn- and anti-5-ethylidene-2,3-dimethylcyclopent-2-enone (9), all three products probably being formed via an oxoniabenzvalene intermediate (6).
J. A. Barltrop, K. Dawes, A. C. Day, S. J. Nuttall and A. J. H. Summers, J. Chem. Soc., Chem. Commun., 1973, 410 DOI: 10.1039/C39730000410
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