Abstract
Under mild conditions 2- and 4-methylpyrylium salts react with ethyl orthoformate to give their β-ethoxyvinyl derivatives. Symmetrical and unsymmetrical cyanine dyes were synthesized by heating the latter with 2- and 4-methylpyrylium salts or N-methylquinaldinium perchlorate. The pyrylocyanines react with perchloric acid to give bispyrylium salts, and they are converted to the corresponding pyridine bases by the action of ammonium acetate.
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