Abstract
During the course of the prepartion of styryl- and isocyaninedyes with 4-phenoxyquinaldine methiodide, the reaction does not occur when the amount of the catalyst amine is small. In an aqueous solution, only the phenoxy radical at 4-position is substituted by the secondary amine, but in alcoholic solution, methyl radicals at both 2- and 4-positions are activated. Use of excess of tertiary amine decomposes styryl dye which transits to isocyanine dye.
