By selective trapping experiments involving furan, trifluoroethanol, and methanol, it is shown that the photochemically reactive state of 3,5-dimethyl-4-pyrone evolves sequentially into a zwitterionic intermediate and 3,6-dimethyl-2-pyrone.
J. A. Barltrop, A. C. Day and C. J. Samuel, J. Chem. Soc., Chem. Commun., 1976, 822 DOI: 10.1039/C39760000822
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