Abstract: Tinctorial composition for keratinous fibers, in particular for human hair, characterized in that it contains, in a medium appropriate for dyeing these fibers, at least one para oxidation dye precursor or at least one ortho oxidation dye precursor in combination with at least one heterocyclic coupler, corresponding to the formula: ##STR1## in which R.sub.1 denotes a hydrogen atom or a C.sub.1 -C.sub.4 alkyl radical; R.sub.2 denotes a hydrogen atom, a C.sub.1 -C.sub.4 lower alkyl radical, a carboxyl radical or an alkoxycarbonyl radical; R.sub.3 denotes a hydrogen or halogen atom, a C.sub.1 -C.sub.4 lower alkyl radical, a carboxyl radical, an alkoxycarbonyl radical or a formyl radical; X denotes a hydrogen atom, a C.sub.1 -C.sub.4 alkyl radical, a halogen atom, a C.sub.1 -C.sub.4 alkoxy radical, an acetylamino group or a dialkyl(C.sub.1 -C.sub.4)aminomethyl group; at least one of the groups X, R.sub.1, R.sub.2 and R.sub.3 differing from hydrogen; as well as their salts.

Abstract: The present invention relates to a novel process for the preparation of indole compounds of the formula II: ##STR1## from N-protected indolines of the formula I.

Abstract: Process for the preparation of 5,6-dihydroxyindole, wherein the compound of formula: ##STR1## in which R' denotes a hydrogen atom or an optionally substituted benzyl radical, is subjected either to the action of hydrogen under pressure or to a hydrogen transfer operation, in a solvent medium and in the presence of a hydrogenation catalyst.

Abstract: Process for the preparation of 5,6-dihydroxyindole, wherein the compound of formula: ##STR1## in which R' denotes a hydrogen atom or an optionally substituted benzyl radical, is subjected either to the action of hydrogen under pressure or to a hydrogen transfer operation, in a solvent medium and in the presence of a hydrogenation catalyst.

Abstract: Process for the preparation of 5,6-dihydroxyindole, wherein the compound of formula: ##STR1## in which R' denotes a hydrogen atom or an optionally substituted benzyl radical, is subjected either to the action of hydrogen under pressure or to a hydrogen transfer operation, in a solvent medium and in the presence of a hydrogenation catalyst.

Abstract: Process for the preparation of 5,6-dihydroxyindole, wherein the compound of formula: ##STR1## in which R' denotes a hydrogen atom or an optionally substituted benzyl radical, is subjected either to the action of hydrogen under pressure or to a hydrogen transfer operation, in a solvent medium and in the presence of a hydrogenation catalyst.

Abstract: Oxidation tinctorial composition intended to be used for dyeing keratinous fibres, in particular human keratinous fibres and especially hair, characterized in that it contains, in a solvent medium appropriate for dyeing these fibres, at least one para oxidation dye precursor or at least one ortho oxidation dye precursor and at least one heterocyclic coupler corresponding to the formula (I): ##STR1## in which: R.sub.1 and R.sub.3, which may be identical or different, denote a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group;R.sub.2 denotes a hydrogen atom, a C.sub.1 -C.sub.4 alkyl group, a carboxyl group or an alkoxycarbonyl group; at least one of the radicals R.sub.2 or R.sub.3 denotes hydrogen;R.sub.4 denotes a hydrogen atom or a C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl or C.sub.2 -C.sub.4 polyhydroxyalkyl group;the group NHR.sub.4 occupying the positions 4, 6 or 7 of the benzene ring, as well as their salts.

Abstract: The invention concerns 4-hydroxy-5-methoxyindole and 5-ethoxy-4-hydroxy-2-methylindole which are useful as dyes for dyeing keratin materials.

Abstract: Process for dyeing keratin fibres consisting in applying on these fibres a composition (A) containing at least one indole colorant of formula: ##STR1## where R.sub.1 =H or C.sub.1 -C.sub.4 alkyl;R.sub.2 and R.sub.3, which may be identical or different, denote H, C.sub.1 -C.sub.4 alkyl, carboxyl or alkoxycarbonyl; or a salt or a precursor of a compound (I), associated, either with iodide ions, or with H.sub.2 O.sub.2 ; application of composition (A) being preceded or followed by the application of a compound (B) which contains, either H.sub.2 O.sub.2 at a pH of 2 to 12 when (A) contains iodide ions, or iodide ions at a pH of 2 to 11 when (A) contains H.sub.2 O.sub.2.This process allows particularly powerful and resistant dyes to be made.

Abstract: The invention relates to the compounds of the formula: ##STR1## in which R.sub.1 and R.sub.2 denote, independently of one another, a hydrogen atom, a C.sub.1 -C.sub.4 alkyl radical or a C.sub.2 -C.sub.3 mono- or polyhydroxyalkyl radical,Z and Z' denote, independently of one another, a C.sub.1 -C.sub.4 alkyl or C.sub.2 -C.sub.4 hydroxyalkyl radical, with the proviso that, when R.sub.1 and R.sub.2 simultaneously denote a hydrogen atom, Z and Z' do not simultaneously denote a methyl radical, and to their addition salts with an acid, to a process for preparation thereof and also to their use, by way of couplers, in an aqueous vehicle, in combination with at least one oxidation dye percursor of the para type, for the dyeing of human hair.The invention also relates to the intermediate compounds of the formula: ##STR2## in which R' denotes a hydrogen atom, a C.sub.1 -C.sub.4 alkyl radical, a C.sub.2 or C.sub.3 mono- or polyhydroxyalkyl radical, or an acetyl or .beta.

Abstract: Trialkoxy-substituted meta-phenylenediamines, a process for their preparation, and their use as couplers for oxidation dying of keratinous fibres and in particulate of human hair.1,3,5-trialkoxy-meta-phenylenediamine of formula: ##STR1## in which: R.sub.1 and R.sub.2 denote, independently of each other, a hydrogen atom, an alkyl radical containing 1 to 4 carbon atoms or a mono- or polyhydroxyalkyl radical containing 2 or 3 carbon atoms,Z denotes an alkyl radical containing from 1 to 4 carbon atoms, provided that, when R.sub.1 and R.sub.2 simultaneously denote a hydrogen atom, Z does not denote the methyl radical, and the addition salts of this compound with an acid.Process for the preparation of these compounds and their use as coupler in oxidation dying compositions for hair.

Abstract: New meta-phenylenediamines, process for preparation thereof, intermediate compounds and use of these metaphenylenediamines as couplers for the oxidation dyeing of keratinous fibres and especially human hair.The invention relates to the compounds of the formula: ##STR1## in which R.sub.1 and R.sub.2 denote, independently of one another, a hydrogen atom, a C.sub.1 -C.sub.4 alkyl radical or a C.sub.2 -C.sub.3 mono- or polyhydroxyalkyl radical,Z and Z' denote, independently of one another, a C.sub.1 -C.sub.4 alkyl or C.sub.2 -C.sub.4 hydroxyalkyl radical, with the proviso that, when R.sub.1 and R.sub.2 simultaneously denote a hydrogen atom, Z and Z' do not simultaneously denote a methyl radical, and to their addition salts with an acid, to a process for preparation thereof and also to their use, by way of couplers, in an aqueous vehicle, in combination with at least one oxidation dye percursor of the para type, for the dyeing of human hair.

Abstract: The invention relates to 2,4-diamino-1,3,5-trimethoxybenzene, a process for its preparation by catalytic reduction of 2,4-dinitro-1,3,5-trimethoxybenzene, and to its use, as a coupler, in combination with at least one oxidation dye precursor of the para type, for dyeing keratinous fibres and particularly human hair.The hair dyeing compositions according to the invention contain, in a cosmetically acceptable aqueous substrate, 0.05 to 3.5% by weight of 2,4-diamino-1,3,5-trimethoxybenzene or one of its salts, which imparts strong blue colors to hair when it is combined with p-phenylenediamines, or red colors when it is combined with p-aminophenols, in an alkaline oxidizing medium.

Abstract: The invention relates to the use, by way of a coupler, of 2,4-diamino-1,3-dimethoxybenzene or one of its addition salts with an acid, in combination with at least one oxidation dye precursor of the para type, for dyeing keratinous fibres and especially human hair.The hair dyeing compositions according to the invention contain, in a cosmetically acceptable aqueous vehicle, 0.05 to 3.5% by weight of 2,4-diamino-1,3-dimethoxybenzene or one of its salts, which imparts to the hair strong blue colorations when it is combined with p-phenylenediamines or red colorations when it is combined with p-aminophenols, in an oxidizing alkaline medium.

Abstract: New chloro-meta-phenylenediamines, their use as couplers in the oxidation dyeing of keratinous fibres, dyeing compositions for hair containing these compounds and dyeing process using the said compositions.The invention relates to the compounds of formula: ##STR1## in which Z and Z' denote, independently of one another, an alkyl radical having from 1 to 4 carbon atoms or a hydroxyalkyl radical having from 2 to 4 carbon atoms, andR.sub.1 and R.sub.2 denote, independently of one another, a hydrogen atom, an alkyl radical having from 1 to 4 carbon atoms or a mono- or polyhydroxyalkyl radical having 2 or 3 carbon atoms, to their addition salts with an acid, and to their use by way of couplers for the oxidation dyeing of keratinous fibres, especially human hair.These compounds, when they are combined with paraphenylenediamines, surprisingly give beige to light brown hues or purple hues of greater or lesser redness, depending on the substitution of the 5-amino group of the chlorobenzene.

Abstract: New chloro-meta-phenylenediamines, their use as couplers in the oxidation dyeing of keratinous fibres, dyeing compositions for hair containing these compounds and dyeing process using the said compositions.The invention relates to the compounds of formula: ##STR1## in which Z and Z' denote, independently of one another, an alkyl radical having from 1 to 4 carbon atoms or a hydroxyalkyl radical having from 2 to 4 carbon atoms, andR.sub.1 and R.sub.2 denote, independently of one another, a hydrogen atom, an alkyl radical having from 1 to 4 carbon atoms or a mono- or polyhydroxyalkyl radical having 2 or 3 carbon atoms, to their addition salts with an acid, and to their use by way of couplers for the oxidation dyeing of keratinous fibres, especially human hair.These compounds, when they are combined with paraphenylenediamines, surprisingly give beige to light brown hues or purple hues of greater of lesser redness, depending on the substitution of the 5-amino group of the chlorobenzene.