Monoazo compounds

A dyestuff of the formula ##SPC62##

• wherein
• D is selected from the group consisting of thiazole-(2)-, 5-nitrothiazole-(2)-, 5-methylsulphonylthiazole-(2)-, 5-cyanothiazole-(2)-, 4-methyl-5-nitrothiazole-(2)-, 4-methylthiazole-(2)-, 4-phenylthiazole-(2)-, 4-(4'-chloro)- phenylthiazole-(2)-, 4-(4'-nitro)- phenylthiazole-(2)-, pyridine-(3)-, quinoline-(3)-, pyrazole-(3)-, 1-phenylpyrazole-(3)-, indazole-(3)-, 1,2,4-thiazole-(3)-, 5-(methyl, ethyl, phenyl or benzyl)-1,2,4-triazole-(3)-, 1-(4'-methoxyphenyl)-pyrazole-(3)-, benzthiazole-(2)-, 6-methylbenzthiazole-(2)-, 6-methoxybenzthiazole-(2)-, 6-chlorobenzthiazole-(2)-, 6-cyanobenzthiazole-(2)-, 6-thiocyanatobenzthiazole-(2)-, 6-nitrobenzthiazole-(2)-, 6-carbethoxybenzthiazole-(2)-, 4- or 6-methylsulphonylbenzthiazole-(2)-, 1,3,4-thiadiazole-(2)-, 1,3,5-thiadiazole-(2)-, 4-(phenyl or methyl)-1,3,5-thiadiazole-(2)-, 5-phenyl-1,3,4-thiadiazole-(2)-, 3-nitro-5-methylsulphothiophene-(2)-, 3,5-bis(methylsulpho)-thiophene-(2)-, 3-methylisothiazole-(5)-, 4-cyanopyrazole-(2)-, 2-(4'-nitrophenyl)-4-cyanopyrazole-(3)-, phthalimide-(3)-, or ##SPC63##
• R.sub.1 ' and R.sub.2 ' are each hydrogen, alkyl of 1 to 4 carbon atoms, benzyl, .beta.-phenylethyl;
• .beta.-chloroethyl, .beta.,.beta.,.beta.-trifluoroethyl, .beta.,.gamma.-dichloropropyl, .beta.-cyanoethyl, .beta.-ethoxyethyl, .delta.-methoxybutyl, .beta.-hydroxyethyl, .beta.,.gamma.-dihydroxypropyl, .beta.-nitroethyl, (.beta.-carbomethoxy)-ethyl, (.beta.-carboethoxy)-ethyl, (.beta.-carbopropoxy)-ethyl, (.beta.-carbomethoxy)-propyl, (.gamma.-carbomethoxy)-propyl, (.beta.-carboethoxy)-propyl, (.gamma.-carboethoxy)-propyl, (.beta.-acetyl)-aminoethyl, (.beta.-formyl)-aminoethyl, .beta.-acetoxyethyl, .beta.,.gamma.-diacetoxypropyl, .beta.-methanesulfonylethyl, .beta.-ethanesulfonylethyl, .beta.-(p-chlorobenzenesulfonyl)-ethyl, .beta.-methylcarbamyloxyethyl, .beta.-phenyl-carbamyloxyethyl, (.beta.-methoxy)-carbonyloxyethyl, (.beta.-ethoxy)-carbonyloxyethyl, (.beta.-isopropoxy)-carbonyloxyethyl, .gamma.-acetamidopropyl, .beta.-(p-nitrophenoxy)-ethyl, .beta.-(p-hydroxyphenoxy)-ethyl, .beta.-(.beta.'-acetylethoxycarbonyl)-ethyl, .beta.-[(.beta.'-cyano)ethoxycarbonyl]-ethyl, .beta.-[(.beta.'-hydroxy) ethoxycarbonyl]-ethyl, .beta.-[(.beta.'-methoxy)ethoxycarbonyl]-ethyl, .beta.-carboxyethyl, .beta.-acetylethyl, .gamma.-aminopropyl, .beta.-diethylaminoethyl, or .beta.-cyanoacetoxyethyl,
• d is hydrogen, methyl, ethyl, methoxy, ethoxy, phenylthio or phenoxy,
• c is hydrogen, methyl, ethyl, methoxy, ethoxy, phenylthio, phenoxy, chloro, bromo, CF.sub.3 --, methylsulfonyl, methylsulfonylamino, ethanesulfonylamino, p-toluenesulfonylamino, phenoxycarbonylamino, methoxycarbonylamino, or aminocarbonylamino, and in which one or two of c, d, R.sub.1 ', or R.sub.2 ' is substituted by a group of the formula
• --X--CO--N(R)--SO.sub.2 --R.sub.2
• wherein
• R.sub.2 is alkyl of 1 to 4 carbon atoms, cyclohexyl, p-tolyl, 2,5-dimethylphenyl, phenyl, 4-chloro, bromo or fluorophenyl,
• X is --O--, --S-- or --NR--, and
• R is hydrogen, alkyl of 1 to 3 carbon atoms, or cyclohexyl.