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The kinetics of the condensation of Fischer's base aldehyde with anilines, yielding hemicyanine dyes, was investigated spectrophotometrically. The study was carried out in aqueous solutions with 30%, 45%, or 60% acetic acid. It was found that the condensation is reversible and first order with respect to each reactant. The apparent second-order rate constant of the process decreased slightly for most...
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