Chrysoidine G

This dye is one of the most widely used direct azo dyes as it is an extraordinarily strong dye. It is not fast to acid or to light. The first step in its preparation involves the preparation of the monoazo dye, sulfo chrysoidine G ... 

DIAMINOAZOBENZENE HYDROCHLORIDE DIAZOCARD CHRYSOIDINE G ELCOZINE CHRYSOIDINE Y LEATHER ORANGE HR 4-(PHENYLAZO)-l,3-BENZENEDIAMINE MONOHYDROCHLORIDE 4-(PHENYLAZO)-m-PHENYLENEDIAMINE xMONOHYDROCHLORIDE PURE CHRYSOIDINE YBH PURE CHRYSOIDINE YD... 

Some of the earliest dyes prepared by this reaction were Bismarck Brown In 1865, and Chrysoidine G in 1876. The latter is very simple in structure and was obtained by coupling diazotized aniline with w-phenylenediamine... 

Amido-azo-benzene Amido-azo-toluene Aniline black Auramine Bismarck brown Brilliant indigo. 4 G. Chrysoidine... 

The B02 contains an azo group, -N=N-, as part of its molecular structure eonneeting two aromatic ring compounds, as depicted by figure 20. The ehemieal name of the B02 is 1,3-benzenediamine, 4-(phenylazo) with a moleeular weight of 248.72 g mol (C12H12N4HCI). This dye is also known as Oreozine Chrysoidine 4. 

Acid Coupling Process. On the other hand, Chrysoidine Y [532-82-1] (22) (Cl Basic Orange 2 Cl 11270) is an example of a dye produced by acid coupling. Aniline, 9.3 g, is diazotized and the diazo solution is added to a solution of 11 g / /-phenylenedi amine in 200 mL water then the solution is made slightly acidic with hydrochloric acid. The reaction mixture is maintained with stirring until coupling is complete as indicated by spot test where, upon addition of an alkaline solution of 2-naphthol, there is no color change if the diazo is exhausted. The solution is warmed to about 60 °C. A concentrated solution of salt is added (about 120 g). The reaction mixture is then allowed to cool and the dye is filtered and dried. Reddish brown water-soluble crystals are obtained. 

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