The title pyrylium cation (7) coexists in water with the enedione pseudobase (12) and the anion [cf.(13)]. The kinetic and equilibrium interrelationships of these species and the corresponding 2H-pyran and oxodienol over a wide pH range have been studied and elucidated.
A. R. Katritzky, M. De Rosa and N. E. Grzeskowiak, J. Chem. Soc., Perkin Trans. 2, 1984, 841 DOI: 10.1039/P29840000841
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