M-diaminobenzenes, their acid adducts and the use thereof in colorants

1. A m-diaminobenzene compound of formula (I):

wherein

n is a number such that 0≦n≦3,

HX stands for an organic or inorganic acid, and

Ar denotes a naphthyl group, a methylenedioxyphenyl group, a substituted or unsubstituted or benzo-condensed five- or six-membered heteroaromatic group,

or a benzo-aromatic group of formula (II)

 wherein R1 to R5, independently of each other, each denote a hydrogen atom, a halogen atom, a hydroxyl group, a nitrile group, a carboxamido group, an acetylamino group, a straight-chain or branched C 1 -C 12 -alkyl group, a straight-chain or branched C 1 -C 12 -alkoxy group, a straight-chain or branched C 1 -C 12 -alkylamino group, a straight-chain or branched di-(C 1 -C 6 )-alkylamino group, a phenyl group, a morpholino group, a pyrrolidino group, a piperidino group, a piperazino group, a C 2 -C 4 -hydroxyalkyl group, a C 2 -C 4 -hydroxyalkoxy group, a benzyloxy group, a trifluoromethyl group, or a methylsulfonyl group; and with the proviso that Ar is not an imidazolyl group.

2. The m-diaminobenzene compound as defined in claim 1 , wherein Ar denotes a pyridinyl group, a furyl group, a thienyl group, a pyrrol group, an indolyl group, or a pyrazolyl group.

3. A m-diaminobenzene compound selected from the group consisting of

1,3-diamino-4-(2-phenylethyl)benzene dihydrochloride,

1,3-diamino-4-[2-(4-methyl phenyl)ethyl]benzene,

1,3-diamino-4-[2-(1-naphthyl)ethyl]benzene dihydrochloride,

1,3-diamino-4-[2-(4-methoxyphenyl)ethyl]benzene,

1,3-diamino-4-[2-(4-hydroxyphenyl)ethyl]benzene dihydrochloride,

1,3-diamino-4-[2-(4-hydroxyphenyl)ethyl]benzene,

1,3-diamino-4-{2-[4-(dimethylamino)phenyl]ethyl}benzene trihydrochloride,

4-[2-(4-cyanophenyl)ethyl]-1,3-diaminobenzene dihydrochloride,

1,3-diamino-4-[2-(4-pyridinyl)ethyl]benzene trihydrochloride,

1,3-diamino-4-[2-(3-pyridinyl)ethyl]benzene trihydrochloride,

1,3-diamino-4-[2-(4-biphenyl)ethyl]benzene dihydrochloride,

1,3-diamino-4-[2-(2,4-dimethoxyphenyl)ethyl]benzene,

1,3-diamino-4-[2-(4-hydroxy-3-methoxyphenyl)ethyl]benzene,

1,3-diamino-4-[2-(3,4,5-trihydroxyphenyl)ethyl]benzene,

1,3-diamino-4-{2-[4-(2-hydroxyethoxy)phenyl]ethyl}-benzene,

1,3-diamino-4-[2-(2-thienyl)ethyl]benzene,

1,3-diamino-4-[2-(2-furyl)ethyl]benzene,

1,3-diamino-4-[2-(5-methyl-2-furyl)ethyl]benzene,

1,3-diamino-4-[2-(1H-indol-3-yl)ethyl]benzene,

1,3-diamino-4-[2-(1-methyl-1H-indol-3-yl)ethyl]benzene and

1,3-diamino-4-[2-(2-pyridinyl)ethyl]benzene trihydrochloride.

4. An agent for oxidative dyeing of fibers, said agent comprising a dye carrier composition and at least one m-diaminobenzene compound of formula I:

wherein

n is a number such that 0≦n≦3,

HX stands for an organic or inorganic acid, and

Ar denotes a naphthyl group, a methylenedioxyphenyl group, a substituted or

unsubstituted or benzo-condensed five- or six-membered heteroaromatic group,

or a benzo-aromatic group of formula (II)

 wherein R1 to R5, independently of each other, each denote a hydrogen atom, a halogen atom, a hydroxyl group, a nitrile group, a carboxamido group, an acetylamino group, a straight-chain or branched C 1 -C 12 -alkyl group, a straight-chain or branched C 1 -C 12 -alkoxy group, a straight-chain or branched C 1 -C 12 -alkylamino group, a straight-chain or branched di-(C 1 -C 6 )-alkylamino group, a phenyl group, a morpholino group, a pyrrolidino group, a piperidino group, a piperazino group, a C 2 -C 4 -hydroxyalkyl group, a C 2 -C 4 -hydroxyalkoxy group, a benzyloxy group, a trifluoromethyl group, or a methylsulfonyl group; and with the proviso that Ar is not an imidazolyl group.

5. The agent as defined in claim 4 , containing from 0.01 to 20 weight percent of said at least one m-diaminobenzene compound of the formula I.

6. The agent as defined in claim 4 , further comprising a developer compound and/or a coupler compound and/or a direct dye compound, and wherein said coupler compound is not said at least one m-diaminobenzene of the formula I.

7. A ready-to-apply composition for oxidative dyeing of fibers, said ready-to-apply composition comprising a dye carrier composition, an oxidant, and at least one m-diaminobenzene compound of formula I:

wherein

n is a number such that 0≦n≦3,

HX stands for an organic or inorganic acid, and

Ar denotes a naphthyl group, a methylenedioxyphenyl group, a substituted or

unsubstituted or benzo-condensed five- or six-membered heteroaromatic group,

or a benzo-aromatic group of formula (II)

 wherein R1 to R5, independently of each other, each denote a hydrogen atom, a halogen atom, a hydroxyl group, a nitrile group, a carboxamido group, an acetylamino group, a straight-chain or branched C 1 -C 12 -alkyl group, a straight-chain or branched C 1 -C 12 -alkoxy group, a straight-chain or branched C 1 -C 12 -alkylamino group, a straight-chain or branched di-(C 1 -C 6 )-alkylamino group, a phenyl group, a morpholino group, a pyrrolidino group, a piperidino group, a piperazino group, a C 2 -C 4 -hydroxyalkyl group, a C 2 -C 4 -hydroxyalkoxy group, a benzyloxy group, a trifluoromethyl group, or a methylsulfonyl group; and with the proviso that Ar is not an imidazolyl group.

8. The ready-to-apply composition as defined in claim 7 , wherein said oxidant is hydrogen peroxide.

9. The agent as defined in claim 4 , consisting of a hair colorant.

10. A method of oxidatively dyeing fibers, said method comprising the steps of:

a) applying a ready-to-apply composition for dyeing fibers to the fibers in an amount sufficient for the dyeing of the fibers;

b) allowing the ready-to-apply composition to act on the hair for about 10 to 45 minutes at about 15° C. to 50° C. and then

c) rinsing the ready-to-apply composition from the fibers;

wherein said ready-to-apply composition comprises a dye carrier composition, an oxidant, and at least one m-diaminobenzene compound of formula I:

wherein

n is a number such that 0≦n≦3,

HX stands for an organic or inorganic acid, and

Ar denotes a naphthyl group, a methylenedioxyphenyl group, a substituted or

unsubstituted or benzo-condensed five- or six-membered heteroaromatic group,

or a benzo-aromatic group of formula (II)

 wherein R1 to R5, independently of each other, each denote a hydrogen atom, a halogen atom, a hydroxyl group, a nitrile group, a carboxamido group, an acetylamino group, a straight-chain or branched C 1 -C 12 -alkyl group, a straight-chain or branched C 1 -C 12 -alkoxy group, a straight-chain or branched C 1 -C 12 -alkylamino group, a straight-chain or branched di-(C 1 -C 6 )-alkylamino group, a phenyl group, a morpholino group, a pyrrolidino group, a piperidino group, a piperazino group, a C 2 -C 4 -hydroxyalkyl group, a C 2 -C 4 -hydroxyalkoxy group, a benzyloxy group, a trifluoromethyl group, or a methylsulfonyl group; and with the proviso that Ar is not an imidazolyl group.

11. The method as defined in claim 10 , wherein said oxidant is hydrogen peroxide or an addition compound of hydrogen peroxide to urea, melamine, or sodium bromate.

12. The method as defined in claim 10 , wherein said oxidant is an aqueous solution of hydrogen peroxide containing from 1 to 12% of said hydrogen peroxide.

13. The method as defined in claim 12 , wherein said dye carrier composition and said oxidant are mixed with one another in a weight ratio of from about 5:1 to 1:3 to form said ready-to-apply composition.

14. The method as defined in claim 10 , wherein said ready-to-apply composition has a pH of 6 to 10.5.