Abstract
7-Hydroxyflavylium salts dimerize in aqueous acetic acid solutions to form benzopyrylium salts substituted at position 4 with the corresponding dihydrochalcone nucleus. It is proposed that this dimerization involves initial condensation of the flavylium salt and its carbinol base to give a product which then undergoes a series of intermolecular hydride ion transfer reactions. It is also suggested that flavones are formed as by-products in these flavylium dimerization reactions.
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