Water-insoluble nitrophenylazophenyl compounds containing a terminal --N--(C.sub.2).sub.n --O--CO-- or --CO--O--CH.sub.2 --CH.sub.2 --C.sub.3 F.sub.5 group

A dyestuff represented by the structural formula:

• ##STR13## in which A is 4-chlorophenyl, 4-cyanophenyl, 2,4-dicyanophenyl, 4-methylsulphonylphenyl, 4-carbomethoxyphenyl, 4-carbethoxyphenyl, 2,4-dichlorophenyl, 4-chloro-2-trifluoromethylphenyl, 2-cyano-4-chlorophenyl, 4-chloro-2-carbomethoxyphenyl, 4-cyano-2,6-dichlorophenyl or:
• ##STR14## wherein U and V are the same or different and each represents hydrogen, chlorine, bromine, nitro, cyano, carbalkoxy containing 2 to 5 carbon atoms or alkylsulphonyl containing 1 to 4 carbon atoms,
• X is hydrogen, methyl, methoxy or ethoxy,
• Y is hydrogen, chlorine, methyl, methoxy, formylamino, acetylamino, 4,4,5,5,5-pentafluoro-valerylamino, benzoylamino, phenylacetylamino or cinnamoylamino,
• Z is --O--CO--CH.sub.2 CH.sub.2 C.sub.2 F.sub.5, --CO--O--CH.sub.2 CH.sub.2 C.sub.2 F.sub.5 or, provided that Y is --NH--CO--CH.sub.2 CH.sub.2 C.sub.2 F.sub.5, hydrogen, hydroxy, cyano, carbalkoxy containing 2 to 5 carbon atoms, acetyloxy, propionyloxy, butyryloxy or valeryloxy,
• n is 1,2, or 3, and either
• R is alkyl containing 1 to 4 carbon atoms, said alkyl being unsubstituted or substituted by one hydroxy, cyano, carbalkoxy containing 2 to 5 carbon atoms, acetyloxy, propionyloxy, butyryloxy or valeryloxy,
• or R is --(CH.sub.2).sub.n --Z', Z' being --O--CO--CH.sub.2 CH.sub.2 C.sub.2 F.sub.5 or --CO--O--CH.sub.2 CH.sub.2 C.sub.2 F.sub.5.