Abstract: A dyestuff of the formula: ##STR1## IN WHICH --CH.dbd.CH--CO--Y is fixed in the 4 or 5 position, X is hydrogen or chlorine, Y is amino or alkoxy containing 1 to 4 carbon atoms, the p-phenylene nucleus A is unsubstituted or substituted by chlorine, alkyl containing 1 to 4 carbon atoms, alkoxy containing 1 to 4 carbon atoms, formylamino, acetylamino, propanoylamino, benzoylamino or cinnamoylamino, m is 0 or 1, and B represents the radical N-methyl (or ethyl)-4-hydroxy-2-oxo-quinolyl, 2-hydroxy-carbazolyl, 3-hydroxy-dibenzofuranyl, 2-phenylindolyl, N-methyl (or ethyl)-2-hydroxy-3-cyano-4-methyl-6-oxopyridyl, 3,6-dimethyl-4-hydroxy-1-phenyl-(4,5,-b)pyrazolopyridyl or the radical of formula: ##STR2## wherein R.sub.3 is hydrogen, methyl, alkoxycarbonyl, carbonamido or alkyl-substituted carbonamido and R.sub.

Abstract: Dyestuffs falling within the formula: ##STR1## in which A represents the residue of a diazotizable amine free from substituents giving rise to an acid dissociation, m is 0 or 1, the benzene nucleus B may be substituted by methyl or methoxy groups, X represents a hydrogen atom or a methyl, methoxy or ethoxy group, Y represents a hydrogen or chlorine atom or a methyl, methoxy or acylamino group, n is 1, 2 or 3, Z represents --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 or, provided that Y is --NHCO--CH.sub.2 CH.sub.2 C.sub.2 F.sub.5, a hydrogen atom or a hydroxy, cyano, alkoxycarbonyl or acyloxy group, and R represents a substituted or unsubstituted alkyl group of low molecular weight or --(CH.sub.2).sub.

Abstract: Dyestuffs of the formula: ##STR1## in which R represents a methyl or ethyl group, R.sub.1 represents a substituted or unsubstituted alkyl group, R.sub.2 represents a hydrogen atom or a substituted or unsubstituted alkyl group, and the benzene nucleus A may be substituted, the molecule being free from groups causing solubility in water by the formation of ions; process for their preparation, process for the coloration of synthetic fibers by means of such dyestuffs, synthetic fibers colored by means of such dyestuffs and diazotizable amines of the formula: ##STR2## in which R represents a methyl or ethyl group.

Abstract: Dyestuffs of the general formula: ##STR1## IN WHICH THE RADICAL --CH=--CN is fixed in the 4- or 5-position, X represents a hydrogen or chlorine atom, the benzene nucleus A is unsubstituted or substituted by at least one chlorine atom or alkyl, alkoxy or acylamino group, m is the number 0 or 1, and B represents the residue of a coupling compound containing no sulphonic or carboxylic acid group.The dyestuffs in which m represents zero may be prepared by diazotizing a base of the formula: ##STR2## and coupling the diazo derivative with a coupling compound BH wherein X and B have the same significance as set out above.The dyestuffs in which m is equal to 1 may be prepared by coupling the diazo derivative of a base of the formula: ##STR3## with an amine of the formula: ##STR4## diazotizing the amino-monoazo dyestuff thus obtained and coupling with a coupling compound BH wherein ##STR5## have the same significance as set out above. The dyestuffs may be used for the coloration of synthetic fibres.

Abstract: Dyestuffs of the general formula: ##STR1## in which the radical --CH=CH--CN is fixed in the 4- or 5- position, X represents a hydrogen or chlorine atom, the benzene nucleus A is unsubstituted or substituted by at least one chlorine atom or alkyl, alkoxy or acylamino group, m is the number 0 or 1, and B represents the residue of a coupling compound containing no sulphonic or carboxylic acid group.The dyestuffs in which m represents zero may be prepared by diazotizing a base of the formula: ##STR2## and coupling the diazo derivative with a coupling compound BH wherein X and B have the same significance as set out above.The dyestuffs in which m is equal to 1 may be prepared by coupling the diazo derivative of a base of the formula: ##STR3## with an amine of the formula: ##STR4## diazotizing the amino-monoazo dyestuff thus obtained and coupling with a coupling compound BH wherein ##STR5## have the same significance as set out above.