ピラゾロンを成分とする二, 三の染料の分析

抄録

Usually azo compounds are identified by cleavage of azo group by reduction, followed by identification of produced. amines This method, however, can not be successfully applied to azo dyes with pyrazolone component, because the resulting amino-pyrazolones are unstable and change rapidly into very complex rubazonic acids. On the other hand, when the hydroxyl group at 5-position of pyrazolone was substituted by chlorine with phosphorous oxychloride, the resultant amino pyrazole derivatives were stable. By this way identification of pyrazolone component can be accomplished.