Untersuchungen zur Reaktion von Pyrazolon-Azomethin-Farbstoffen mit 2-Pyrazolin-5-on-Derivaten

Investigations on the Reaction of Pyrazolone Azomethine Dyes with 2-Pyrazolin-5-one-Derivatives The reaction between pyrazolone azomethine dyes 1 and different 2-pyrazolin-5-ones 2 was investigated. Among the reaction products compounds 5 {3,3′3″-trimethyl-1,1′1″-triphenyl-[4,4′4″-tri-(2-pyrazolin-5-on)]} was isolated, which hitherto was unknown as a product of this reaction. A new reaction pathway is proposed.     

Untersuchungen zur Reaktion von Pyrazolonazomethin-Farbstoffen mit 2-Pyrazolin-5-on

Investigation of Reactions of Pyrazolin-Azomethin Dyes with 2-Pyrazolin-5-one The pyrazolin-azomethin dyes ( 3a – d ) from 1-phenyl-3-methyl-2-pyrazolin-5-one and various photographic developers have been obtained. The reactions of decolourization of dyes during the 3-methyl-1-phenyl-2-pyrazolin-5-one action was investigated. We ascertained that the substituent changes in the developer had not only the influence on decolourization rate but they also had influence on the order change of the reaction. The various solvents had the same influence on the reaction rate of decolourization.