Abstract: The subject of the present invention is symmetric or dissymetric azomethine direct dyes comprising at least one pyrazolopyridine unit of formula (I), a composition comprising said dyes, a process for treating keratin fibers using said dyes, a process for preparing these compounds, synthesis intermediates and a kit. In which formula (I) X, Y1, Y2, Z1, and R1 to R5 are as defined in the description.

Abstract: The present invention relates to dissymmetric azomethine direct dyes of formula (I) and the leuco forms thereof of formula (II), and also to the use thereof for dyeing keratin fibres, in particular human keratin fibres such as the hair: in which formula (I) or (II) R1, R2, R3, R4, R5, R6, n and n? are as defined in the description. The compounds of formula (I) or (II) according to the invention can give powerful, chromatic and sparingly selective colourings with good colour build-up, which are resistant to the various attacking factors to which keratin fibres may be subjected, such as inclement weather, light, washing and perspiration.

Abstract: The present invention relates to a composition for dyeing keratin fibres, comprising: (a) at least one 2-amino-5-ethyl-phenol coupler, or an addition salt or solvate thereof, and (b) at least one oxidation base 3-(2,5-diaminophenyl)-1-propanol and/or the addition salts thereof or solvates thereof. The invention also relates to a process for dyeing keratin fibres using this composition. Finally, the invention relates to the use of such a composition for dyeing keratin fibres, and in particular the hair.

Abstract: The present invention relates to novel cationic azomethine direct dyes of formula (I) and the leuco forms thereof of formula (II), and also to the use thereof for dyeing keratin fibres, in particular human keratin fibres such as the hair: (I) (II) in which formula (I) or (II) X1, X2, R1, R2, R3, R4, R5, R6, n and n? are as defined in the description. The compounds of formula (I) according to the invention can give powerful, chromatic and sparingly selective colourings with good colour build-up, which are resistant to the various attacking factors to which keratin fibres may be subjected, such as inclement weather, light, washing and perspiration.

Abstract: The present invention relates to a composition for dyeing keratin fibres, in particular keratin fibres such as the hair, comprising: a) at least one oxidation base 3-(2,5-diaminophenyl)-1-propanol acid salts thereof or solvates thereof such as hydrates; b) at least one heterocyclic oxidation base; c) at least one coupler; d) optionally at least one fatty substance; e) optionally at least one basifying agent; and f) optionally at least one chemical oxidizing agent. The invention also relates to a process for dyeing keratin fibres such as the hair using the composition of the invention, and to a multi-compartment device for using the composition of the invention.

Abstract: The subject of the present invention is symmetric or dissymetric azomethine direct dyes comprising at least one pyrazolopyridine unit of formula (I), a composition comprising said dyes, a process for treating keratin fibers using said dyes, a process for preparing these compounds, synthesis intermediates and a kit. In which formula (I) X, Y1, Y2, Z1, and R1 to R5 are as defined in the description.

Abstract: The present invention relates to a composition for dyeing keratin fibres, in particular keratin fibres such as the hair, comprising: a) at least one oxidation base 3-(2,5-diaminophenyl)-1-propanol acid salts thereof or solvates thereof such as hydrates; b) at least one heterocyclic oxidation base; c) at least one coupler; d) optionally at least one fatty substance; e) optionally at least one basifying agent; and f) optionally at least one chemical oxidizing agent. The invention also relates to a process for dyeing keratin fibres such as the hair using the composition of the invention, and to a multi-compartment device for using the composition of the invention.

Abstract: The invention relates to a compound chosen from dyes of azomethine type bearing a pyrazolopyridine unit of formula (I) and the leuco forms thereof of formula (II) below, and also the optical isomers and geometrical isomers thereof, the tautomers thereof, the addition salts thereof with an acid or a base, and the solvates thereof. The invention also relates to the use of these particular compounds for dyeing keratin fibers.

Abstract: The invention relates to a compound chosen from the compounds of formulae (I) and (II), the leucoforms thereof, the optical and geometrical isomers thereof and the tautomers thereof, and also the addition salts thereof with an acid or a base, and the solvates thereof. The invention also relates to the use of these particular compounds for dyeing keratin fibres.

Abstract: The present invention relates to a composition for dyeing keratin fibres, in particular keratin fibres such as the hair, comprising: a) at least one oxidation base 3-(2,5-diaminophenyl)-1-propanol acid salts thereof or solvates thereof such as hydrates; b) at least one heterocyclic oxidation base; c) at least one coupler; d) optionally at least one fatty substance; e) optionally at least one basifying agent; and f) optionally at least one chemical oxidizing agent. The invention also relates to a process for dyeing keratin fibres such as the hair using the composition of the invention, and to a multi-compartment device for using the composition of the invention.

Abstract: The present invention relates to the use of one or more particular dihydroisoquinolinium salts of formula (I) for treating keratin materials, in particular keratin fibres, especially human keratin fibres such as the hair. The invention also relates to a process for treating keratin materials using said salts and optionally one or more chemical oxidizing agents. A subject of the invention is also a composition for lightening keratin materials, comprising one or more dihydroisoquinolinium salts and one or more chemical oxidizing agents. The present invention also relates to one or more particular dihydroisoquinolinium salts and also to compositions containing them, in particular compositions comprising a physiologically acceptable medium.

Abstract: Use of dihydroisoquinolinium salts for treating keratin materials, compositions and implementation processes The present invention relates to the use of one or more dihydroisoquinolinium salts for treating keratin materials, in particular keratin fibres, especially human keratin fibres such as the hair. The invention also relates to a process for treating keratin materials using said salts and optionally in the presence of one or more chemical oxidizing agents. A subject of the invention is also a composition for lightening keratin materials, comprising one or more dihydroisoquinolinium salts as defined below and one or more chemical oxidizing agents.

Abstract: The present invention relates to the use of one or more dihydroisoquinolinium double salts for treating keratin materials, in particular keratin fibres, especially human keratin fibres such as the hair. The invention also relates to a process for treating keratin materials using said salts and optionally in the presence of one or more chemical oxidizing agents. A subject of the invention is also a composition for lightening keratin materials, comprising one or more dihydroisoquinolinium double salts as defined below and one or more chemical oxidizing agents. The present invention also relates to one or more particular dihydroisoquinolinium double salts and also to compositions containing them, in particular compositions comprising a physiologically acceptable medium.

Abstract: Composition for dyeing the hair, comprising a heterocyclic oxidation base and a 2-amino-5-ethylphenol coupler The present invention relates to a composition for dyeing keratin fibres, comprising a particular heterocyclic oxidation base and a 2-amino-5-ethylphenol coupler. The invention also relates to a process for dyeing keratin fibres using this composition. Finally, the invention relates to the use of such a composition for dyeing keratin fibres, and in particular the hair.

Abstract: The invention relates to a 1,2,3,4-tetrahydropyrido[2,3-b]pyrazin-7-amine compound of formula (I) below, addition salts thereof, optical isomers, geometrical isomers and tautomers thereof and/or solvates thereof: in which: .R2, R3, R4, R5, and R7 independently represent: a hydrogen or halogen atom; a C1-C4 alkyl radical; a C1-C4 hydroxyalkyl radical; a carboxyl radical; a (C1-C4)alkoxycarbonyl radical; .R1 and R6, which may be identical or different, represent: hydrogen atom; C1-C10 and preferably Ci-C6 alkyl radical,—optionally interrupted with one or more heteroatoms chosen from O and S or with one or more groups—NR and/or—optionally terminating with at least one group—NX1X2 or at least one group —OX3, .

Abstract: The invention relates to the use of a compound of formula (I) below, addition salts thereof, optical isomers, geometrical isomers and tautomers thereof and/or solvates thereof: Formula (I) in which: • R represents a hydrogen atom or a C1-C4 alkyl or C1-C4 hydroxyalkyl radical, preferably a hydrogen atom, • R2, R3, R4 and R5 independently represent: —a hydrogen atom, —a linear C1-C4 or branched C3-C4 alkyl radical, optionally substituted with a hydroxyl radical, • R1 represents a linear C2-C10 or branched C3-C10 alkyl radical, optionally interrupted with one or more heteroatoms chosen from O or S or with one or more groups —NR?, said alkyl radical ending with a group —NX1X2 or —OX3 or a radical chosen from: Formula (II) —X1 and X2 independently denote ? a hydrogen atom ? a linear C1-C6 alkyl radical or a branched C3-C6 alkyl radical ? a linear C1-C6 hydroxyalkyl radical or a branched C3-C6 hydroxyalkyl radical, X1 and X2 may form, with the nitrogen atom that bears them, a saturated or unsaturated 5- to 8-membe

Abstract: The present invention relates to a composition for dyeing keratin fibres, in particular keratin fibres such as the hair, comprising: a) at least one oxidation base 3-(2,5-diaminophenyl)-1-propanol acid salts thereof or solvates thereof such as hydrates; b) at least one heterocyclic oxidation base; c) at least one coupler; d) optionally at least one fatty substance; e) optionally at least one basifying agent; and f) optionally at least one chemical oxidizing agent. The invention also relates to a process for dyeing keratin fibres such as the hair using the composition of the invention, and to a multi-compartment device for using the composition of the invention.

Abstract: The invention relates to a compound chosen from dyes of azomethine type bearing a pyrazolopyridine unit of formula (I) and the leuco forms thereof of formula (II) below, and also the optical isomers and geometrical isomers thereof, the tautomers thereof, the addition salts thereof with an acid or a base, and the solvates thereof. The invention also relates to the use of these particular compounds for dyeing keratin fibres.

Abstract: The invention relates to a compound chosen from the compounds of formulae (I) and (II), the leucoforms thereof, the optical and geometrical isomers thereof and the tautomers thereof, and also the addition salts thereof with an acid or a base, and the solvates thereof. The invention also relates to the use of these particular compounds for dyeing keratin fibres.

Abstract: The invention relates to novel cationic benzoxazine-based compounds of formula (I) below, in which •R represents a hydrogen atom or a C1-C4 alkyl or C1-C4 hydroxyalkyl radical, •—R2, R3, R4 and R5 independently represent: —a hydrogen atom, —a linear C1-C4 or branched C3-C4 alkyl radical, optionally substituted with a hydroxyl radical, •L represents a linear or branched, saturated C1-C30 hydrocarbon-based chain, •CAT+ represents a cationic radical chosen from: —a cationic heterocyclic radical comprising 5 to 8 ring members containing at least one heteroatom chosen from O, N and S, —a tri(hydroxy)(C1-C4)alkylammonium radical, —a non-cationic heterocycle comprising 5 or 6 ring members containing at least one heteroatom chosen from O and N, such as pyrrolidine, substituted with a cationic radical, An? represents an anion or a mixture of anions which are organic or inorganic and are cosmetically acceptable.