Yellow, Acid

This mixture is known as Quinoline Yellow A [8003-22-3] (Cl 47000) and is most widely used with polyester fibers (109). Upon sulfonation, the water-soluble Quinoline Yellow S or Acid Yellow 3 [8004-92-0] (Cl 47005) is obtained. This dye is used with wool and its aluminum salt as a pigment. Foron Yellow SE-3GL (Cl Disperse Yellow 64) is the 3-hydroxy-4-bromo derivative. Several other quinoline dyes are commercially available and find apphcations as biological stains and analytical reagents (110). 

Of these dyes, Acid Yellow 151 (37) still has the greatest market among the yellows. As reported by USITC, production had increased to 1989 tons in 1985 from 706 tons in 1975. It is produced by coupling diazotized 2-amino-l-phenol-4-sulfonamide to acetoacetanilide followed by metallizing with cobalt to obtain a 1 2 cobalt complex. Acid Orange 24 (38), which is sulfanilic acid coupled to resorcinol to which diazotized mixed xyUdines have been coupled, is an unsymmetrical primary diasazo dye with a bihinctional coupling component. 

GK [10343-58-5] (S ) (Cl Acid Yellow 99 Cl 13900) (4-nitro-2-aminophenol —> aceto acetanilide) and Palatine FastRedBEN [6656-02-6] (59) (Cl Acid Red 214 Cl 19355) (2-amiao-6-nitroplienol-4-sulfonic acid — 2,4-dihydroxyquiQoline). 

The Cl name for a dye is derived from the appHcation class to which the dye belongs, the color or hue of the dye, and a sequential number, eg. Cl Acid Yellow 3, Cl Acid Red 266, Cl Basic Blue 41, and Cl Vat Black 7. A five digit Cl number is assigned to a dye when its chemical stmcture has been made known by the manufacturer. The following example illustrates these points, where CA indicates Chemicalj bstracts and Cl Colourindex. 

Pontacyl Light Yellow GX [Acid Yellow 17, l-(2,5-dichloro-4-sulfophenyl]-3-methyl-4-(4-sulfophenylazo)-5-hydroxypyrazole di-Na Salt] [6359-98-4] M 551.3, Cl 18965, Xmax... 

To B20 mg of 7-amino-thiazolo (5,4-d) pyrimidine was added 2.5 cc of 2 N sodium hydroxide. The water was removed under reduced pressure. The sodium salt was then heated at 240°C for one hour, during which time it melted, gave off water and resolidified. The sodium salt of 6-mercaptopurine was dissolved in 15 ml of water and acidified to pH 5 with acetic acid. Yellow crystals of 6-mercaptopurine hydrate precipitated, according to U.S. Patent 2,933,49B. 

For instance, trenbolone fluoresces yellow [12] and the qinoxalone derivative of pyruvic acid yellow-green [18]. In the case of steroids and Digitalis glycosides it is possible to differentiate on the basis of various fluorescence colors [8, 9, 15]. 

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