Abstract
δ-Alkoxy-δ-methylbutadienyl salts were obtained by condensation of acetoacetaldehyde tetraethylacetal with quaternary salts of nitrogen-containing heterocyclic bases. δ-Methyl-substituted tetramethylidynehemicyanines were obtained by the reaction of the acetal with quaternary salts of heterocyclic bases and amines in pyridine. β-Methyl-substituted dicarbocyanine and α-methyl-substituted tetramethylidynemerocyanine dyes were synthesized.
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