U.v. irradiation of 2,4,6-trimethylpyrylium perchlorate (1) in water gives 2,4-dimethyl-5-oxohex-2-enal (2), possibly via an oxoniabenzvalene intermediate (3).
J. A. Barltrop, K. Dawes, A. C. Day and A. J. H. Summers, J. Chem. Soc., Chem. Commun., 1972, 1240 DOI: 10.1039/C39720001240
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