Abstract
About three years ago one of us laid before the German Chemical Society the results of some experiments on the naphthaline dye commercially called Magdala Red. These experiments showed that the dye in question represents three molecules of naphthylamine which have lost three molecules of hydrogen, and that it is formed by the action of naphthylamine on azodinaphthyldiamine with separation of one molecule of ammonia. C 20 H 15 N 3 +C 10 H 9 =C 30 H 21 N 3 +H 3 N. Azodinaphthyldiamine. Naphthylamine. Naphthylamine red. The idea occurred to us of studying this reaction in other series and in other combinations. Preliminary experiments showed at once that aniline, as well as toluidine salts, readily act on azodinaphthyldiamine, forming perfectly similar red colouring-matters; and the question finally presented itself, whether to this group of dyes might not belong also the blue body which MM. Martius and Griess produced by treating azodiphenyldiamine with salts of aniline, as mentioned in their interesting paper on Amidodiphenylimide, but which has not as yet been more minutely investigated.
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