Abstract: N-Aryl-4,5-diaminopyrazole of formula (I) or a physiologically compatible salt thereof of an organic or inorganic acid wherein R1 and R2 independently of each other denote a hydrogen atom, a straight-chain or branched C1-C6-alkyl group, a hydroxyl group, a straight-chain or branched C1-C6-monohydroxyalkyl group, a straight-chain or branched C3-C6-dihydroxyalkyl group, a straight-chain or branched C1-C6-alkoxy group, a straight-chain or branched C1-C6-hydroxyalkoxy group, a straight-chain or branched C3-C6-dihydroxyalkoxy group, an amino group, a C1-C4-monoalkylamino group, a di(C1-C4)-alkylamino group, a halogen atom, a difluoromethyl group or a trifluoromethyl group; Y stands for a nitrogen atom or a C—R3 group, wherein C is a carbon atom of the aromatic ring and R3 is a hydrogen atom, a halogen atom, a straight-chain or branched C1-C6-alkyl group, a straight-chain or branched C1-C6-hydroxyalkyl group, a straight-chain or branched C1-C6-alkoxy group, a straight-chain or branched C2-C6-hydroxyalkoxy gr

Abstract: The new diaminopyrazole compounds are bridged 4,5-diaminopyrazole compounds or salts thereof.

Abstract: The object of the invention is a colorant for brightening and coloring keratin fibers which contains (a) an oxidant and (b) at least one yellow direct dye of formula (I) and/or a red direct dye of formula (II) and/or a blue direct dye of general formula (III), and (c) has a basic pH 1

Abstract: The aqueous or aqueous-alcoholic oxidative dye precursor composition includes 1,4-diamino-2-methoxymethylbenzene, or a physiologically compatible salt thereof, as developer substance and one or more conventional coupler compounds. A ready-to-apply hair dyeing mixture having a pH of 6 to 10.5 is made by mixing the aqueous or aqueous-alcoholic oxidative dye precursor composition with an oxidizing agent, such as 6% hydrogen peroxide in a weight ratio of 5:1 to 1:3. The compositions may also contain conventional cosmetic additive ingredients and direct-dyeing dye compounds.

Abstract: The method of dyeing keratin fibers includes the steps of providing an oxidation dye precursor composition containing from 0.01 to 10 percent by weight of a total amount of at least one coupler compound and at least one developer compound, mixing the oxidation dye precursor composition with an oxidizing agent and applying the resulting mixture to the keratin fibers. The oxidation dye precursor composition is characterized by containing 1,4-diamino-2-methoxymethylbenzene, or a physiologically compatible salt thereof, either alone as sole developer compound, or in combination with other known developer compounds. The oxidation dye precursor composition can also contain at least one direct-dyeing dye compound and conventional cosmetic additive ingredients.

Abstract: A process is described for making 1,4-diamino-2-methoxymethylbenzene of formula (I), or a physiologically compatible salt of 1,4-diamino-2-methoxy-methylbenzene, of formula (I): 1

Abstract: In the method of temporarily coloring and later decoloring hair a hair colorant is applied and allowed to remain on the hair for an exposure time of 10 to 45 minutes at 20 to 50° C. and then rinsed out. Then at a later time, as desired, the hair is decolorized. The aqueous hair colorant contains 0.01 to 5 percent by weight of at least one dye compound of formula (IV), or a physiologically tolerated salt thereof; wherein n=0, 1 or 2 and R1 represents a C1- to C4-alkyl group, a hydroxyethyl group, a dihydroxypropyl group, a methoxyethyl group, a carboxyethyl group, a C1- to C4-sulfoalkyl group, an unsubstituted or substituted phenyl radical with halogen, sulfonic or carboxylic acid substituents; R2 represents a hydrogen, a methyl group, a carboxylic acid group, a carboxylic acid group esterified with a C1- to C4-alcohol or a carboxamido group; and Y represents an aromatic five-membered heterocyclic ring, which may or may not be benzoanellated.

Abstract: The new diaminopyrazole compounds are bridged 4,5-diaminopyrazole compounds or salts thereof.

Abstract: A process is described for making 2-aminomethyl-1,4-diaminobenzene, or a physiologically compatible salt of 2-aminomethyl-1,4-diaminobenzene, of formula (I): wherein n is a number from 0 to 3 and HX represents an inorganic or organic salt. In this process 2-(N-acylaminomethyl)-4-nitrophenol is first reacted with a halogen acetamide to form 2-(2-N-acylaminomethyl-4-nitrophenoxy)acetamide, which is then converted to 2-(N-acylaminomethyl)-4-nitroaniline. Subsequently the 2-(N-acylaminomethyl)4-nitroaniline is reduced to form 1,4-diamino-2-(N-acylaminomethyl)benzene, which is then deacylated by adding hydrochloric acid in a sufficient amount so that 1,4-diamino-2-aminomethylbenzene trihydrochloride is formed. Then the trichloride is converted to the free base form, 1,4-diamino-2-aminomethylbenzene, or to another salt of 1,4-diamino-2-amino-methylbenzene when n≠0 with the proviso that if n=3 HX is not hydrochloric acid.

Abstract: The object of the present invention is a colorant for the semi-permanent tinting of keratin fibers, said colorant being based on a combination of nonoxidative dyes and polymethine dyes of the tautomeric formula (Ia)/(Ib) and a method for tinting keratin fibers.

Abstract: The object of the present invention are colorants for keratin fibers, containing at least one polymethine dye of formula (I) or a physiologically tolerated salt thereof 1

Abstract: The method for temporarily coloring and later decolorizing hair includes applying a colorant to the hair, which contains a monomethine or polymethine dye of formula (Ia/Ib), or a salt thereof, W=L−V′(Ia)&rlarr2;W′−L=V (Ib), wherein W=L−V′ and W′=L−V are tautomers, W and V are each a substituted five-member or six-member heterocyclic ring, each of which is a substituted pyrazolone, substituted pyridone, substituted dioxothiazoline, substituted rhodanine, substituted dioxoimidazolidine or substituted barbituric acid; wherein L represents —[—CH═CH—]m—CR═[═CH—CH═]n═ and R is hydrogen, a phenyl group, a halogen atom, a methyl group or a carboxamido group, and wherein m and n are each 0, 1 or 2, but n+m≦2; then allowing the colorant to act for from 10 to 45 min at 20 to 50° C.

Abstract: The new bis-pyrazole aza compounds have the formula (I): ##STR1## wherein R.sub.1, R.sub.1 ', R.sub.2, R.sub.2 ', R.sub.3 and R.sub.3 ' are the same or different, and are each, independently of each other, H, a straight, branched or cyclic alkyl group having 1 to 6 carbon atoms, a straight chain or branched monohydroxyalkyl group or polyhydroxyalkyl group with 1 to 6 carbon atoms, a straight or branched alkoxyalkyl group with 2 to 6 carbon atoms, a straight or branched monoaminoalkyl group or polyaminoalkyl group with 2 to 6 carbon atoms, or an unsubstituted aromatic or heteroaromatic ring, or a substituted aromatic or heteroaromatic ring having one or more halogen, a C.sub.1 - to C.sub.4 -alkyl group, a nitro group, a sulfonic acid group, a carboxylic acid group or a C.sub.1 - to C.sub.4 -alkoxy substituent, or an unsubstituted benzyl group, or a benzyl group substituted with one or more halogen atom, a hydroxy group, a C.sub.1 - to C.sub.4 - alkyl group, a nitro group or a C.sub.1 - to C.sub.