Abstract: Cationic naphthyldiazo dyes of general formula (I) and colorants for keratin fibers containing these dyes.

Abstract: Novel cationic 4,5-diaminopyrazole derivatives of general formula (I) the colorants for keratin fibers containing these compounds and a process for producing the compounds of formula (I).

Abstract: The object of the present invention are (3,5-diaminophenyl)(2,4-dihydroxyphenyl)methanone and the acid adducts thereof of formula (I), with 0?n?2 and HX denoting an inor-ganic or organic acid, the colorant containing these compounds and a method for producing the compounds of formula (I).

Abstract: Cationic naphthyldiazo dyes of general formula (I) and colorants for keratin fibers containing these dyes.

Abstract: The present invention relates to novel m-diaminobenzenes of formula (I) to the use thereof in colorants and to the oxidative hair colorants containing said m-diaminobenzenes.

Abstract: The object of the present invention are (3,5-diaminophenyl)(2,4-dihydroxyphenyl)metha-none and the acid adducts thereof of formula (I), with 0?n?2 and HX denoting an inor-ganic or organic acid, the colorant containing these compounds and a method for producing the compounds of formula (I).

Abstract: The composition for dyeing fibers is obtained before use by mixing a first component A1, containing at least one enamine of the formula (I) with a second component A2, containing at least one carbonyl compound. A multi-component kit for dyeing and, later on, decolorizing fibers, and a method for temporarily dyeing hair with the composition for dyeing fibers and later removing the dyed hair color with a decolorizing component B containing a sulfite are also provided. The multi-component kit for dyeing and, later on, decolorizing fibers, separately contains the first component A1, the second component A2 and the decolorizing component B.

Abstract: Novel cationic 4,5-diaminopyrazole derivatives of general formula (I) the colorants for keratin fibers containing these compounds and a process for producing the compounds of formula (I).

Abstract: The present invention relates to novel m-diaminobenzenes of formula (I) to the use thereof in colorants and to the oxidative hair colorants containing said m-diaminobenzenes.

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

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: 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.