Pyrylium-mediated transformations of natural products. Part 1. Synthesis and hydrolysis of 4-(4-methoxy-3-sulphophenyl)-2,6-bis-(4-sulphophenyl) pyrylium perchlorate: a new water-soluble pyrylium cation

Abstract
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.

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