Abstract: The oxidation hair dye composition contains from 0.01 to 4.0 percent by weight of a developer substance including at least one diaminopyrazole of the formula (I) ##STR1## wherein R.sup.1 is selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 carbon atoms, a hydroxyalkyl group having from 2 to 4 carbon atoms and a substituted or unsubstituted benzyl group, and R.sup.2 and R.sup.3, independently, are each selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 carbon atoms and a hydroxyalkyl group having from 2 to 4 carbon atoms; and from 0.01 to 4.0 percent by weight of a coupler substance including at least one m-phenylenediamine selected from the group consisting of N-(3-dimethylamino)phenyl urea and 3-(N-methylsulfonyl)amino-N,N-dimethylaniline.

Abstract: The new coupler compounds of the invention are 4-amino-2 -(2'-hydroxyethyl)-amino-5-methoxytoluene and/or 4-amino-2-(2'-hydroxyethyl)amino-5-chlorotoluene. The invention also includes an oxidation hair dye composition including an effective amount, advantageously from 0.01 to 5 percent by weight, of the above-mentioned new coupler compounds together with one or more known developer compounds and optionally certain direct dyes.

Abstract: The composition for the oxidative dyeing of hair contains at least one coupler of the general formula ##STR1## where R is a straight-chain or branched C.sub.1 - to C.sub.4 -alkyl group, X is chlorine or fluorine, and R.sup.1 is a straight-chain or branched C.sub.1 - to C.sub.4 -alkyl group or a straight-chain or branched C.sub.2 - to C.sub.4 -hydroxyalkyl group. The 5-halogen-2,4-bis(alkylamino)-1-alkylbenzenes of the formula (I) are novel. The couplers of the general formula (I) may be obtained through simple chemical reactions, are easily soluble in water and have an outstanding shelf stability, in particular as a constituent of the hair dye composition described here. The dyeing results which can be achieved with the hair dye composition according to the invention are particularly distinguished by the color intensity of the red hues, in addition to the multitude of shades, and by a good purity of color with respect to blue hues.

Abstract: Process for producing 5-alkoxy-2,4-dinitroalkylbenzenes of the general formula (I) ##STR1## R.sup.1 =C.sub.1 to C.sub.4 alkyl; R=C.sub.1 to C.sub.6 alkyl group, C.sub.2 to C.sub.4 hydroxyalkyl, C.sub.3 to C.sub.4 dihydroxyalkyl,in which a 3-fluoroalkylbenzene is nitrated and the obtained 2,4-dinitro-5-fluoroalkylbenzene is then reacted with a suitable alcohol at -5.degree. C. to +25.degree. C. with the addition of sodium hydroxide or potassium hydroxide.

Abstract: The composition for the oxidative dyeing of hair contains at least one coupler substance of the formula ##STR1## where R is a straight-chain or branched C.sub.1 - to C.sub.4 -alkyl group and X is fluorine or bromine, and new 5-halogen-2,4-diaminoalkylbenzenes.The coupler substances of formula (I) are obtainable by simple chemical reactions, easily soluble in water and have a good shelf stability particularly as constituents of the hair dye composition described here.In addition to the multitude of color shades, the dye results which can be achieved with the hair dye composition according to the invention are distinguished particularly by the intensity of color of the red tones and good uniformity of color of the blue tones.