Dehydrothio-p-toluidine

The thiazole ring system is found in many types of dye. Thiazole-containing sulphur dyes and primuline were considered in section 6.4-2. Quaternised dehydrothio-p-toluidine 6.133 is available as Cl Basic Yellow 1 (6.152). Other derivatives of this intermediate are used as direct dyes, such as Cl Direct Yellow 8 (4-58). The benzothiazole ring appears in various azo disperse dyes [14], quatemisation of which gives useful cationic dyes, an important example being Cl Basic Blue 41 (4.99). Another example containing a quaternised thiazole ring is Cl Basic Red 29 (4-102). 

An example of a yellow sulfur dye is Immedial Supra Yellow GWL which may be prepared by thionation of a mixture of benzidine and dehydrothio-p-toluidine. Zerweek and coworkers suggested the structure consists of four dyes but a more recent degradative study indicates that the major component is (26) (62CCC1533). 

Preparation 302. — Dehydrothio-p-toluidine (Y-amino-l-phenyl-5-methylbemotkiazole sulphonate). 

Research by Zerweck et al. [2] suggests that many bake dyes contain thiazole rings. It was already known that dehydrothio-p-toluidine, which can be made by sulfur baking of />-toluidinc, and primulin bases, which are formed at higher temperatures, are both thiazole derivatives. 

Acetoacetic acid arylides and pyrazolone derivatives are the coupling components mainly used. Naphtbolsulfonic acids are of only minor importance here. Dehydrothio- p-toluidine sulfonic acid (2) and the sulfonated primulin base are also used as diazo components for certain orange disazo direct dyes. 

Substantive yellow monoazo dyes with very good light fastness are also obtained by oxidation of dehydrothio-p-toluidine and its derivatives. Oxidation of the sodium salt of the monosulfonic acid of the primulin base in the alkaline pH range with sodium hypochlorite results, for example, in C. I. Direct Yellow29, 19556 [6537-66-2] (22). 

Aminophenyl)-6-methylbenzothiazole 2-(p-Aminophenyl)-6-methylbenzothiazole. See Dehydrothio-p-toluidine 2-(4-Aminophenyl)-6-methylbenzothiazole... 

Benzenamine, N-methyl-. See N-Methylaniline Benzenamine, 4-(6-methyl-2-benzothiazolyl)-. See Dehydrothio-p-toluidine Benzenamine, 4,4 -methylenebis-. See 4,4 -Methylenedianiline... 

See Dehydrothio-p-toluidine Benzothiazole disulfide. See Benzothiazyl disulfide... 

Methyl-2H-1 -benzopyran-2-one 6-Methylbenzopyrone 6-Methyl-1,2-benzopyrone. See 6-Methylcoumarin p-(6-Methylbenzothiazol-2-yl) aniline 4-(6-Methyl-2-benzothiazolyl) benzenamine. See Dehydrothio-p-toluidine Methyl-1 H-benzotriazole. See Tolyltriazole... 

Chloro-1,3-propanediol 3-Chloro-p-toluidine Cyclohexylamine Decene-1 Dehydrothio-p-toluidine... 

Dehydrothio-p-toluidine 202-156-7 2,3-Naphthalenediol Rodol 23N 202-158-8 6-Methylcoumarin 202-160-9 Emery 5707 Phenylethylethanolamine 202-163-5 Biphenyl 202-169-8 Ethyl benzylaniline 202-176-6 4-Bromobiphenyl 202-177-1 4-Aminobiphenyl 202-179-2 p-Phenylphenol 202-181-3 Diphenyloxazole 202-194-4 Xanthene 202-196-5 Phenothiazine Phenothiazine LVT 2005 PIZ Chemical Grade PIZ Industrial Grade PTZ Purified Flake PTZ Purified Powd. 

There are two methods commonly used for magnesium determination. The first one is based on reaction, in sodium hydroxide media, with Titan Yellow (sodium salt of dehydrothio-p-toluidine sulfonic acid) to produce a colored red colloidal suspension. The other method is based on reaction with Solo-chrome Black to give a red soluble complex. 

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