Brightening direct dyes for keratin fibers and colorants containing these compounds

1. A cationic naphthalene derivative selected from the group consisting of 4-{(E)-[(1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}-1-(2-hydroxyethyl)pyridinium bromide, 4-{[(E)-[2-{4-[ethyl(2-hydroxyethyl)amino]phenyl}-(1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}-1-methylpyridinium methylsulfate, 1-(2-hydroxyethyl)-4-{(E)-(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)iminomethyl}pyridinium bromide, 1-methyl-4-{(E)-[(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}pyridinium methylsulfate, 1-methyl-4-{(E)-[(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}quinolinium methylsulfate, 4-[(E)-({2-[2-hydroxy-1-(hydroxymethyl)ethyl]-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl}imino)methylpyridinium methylsulfate, 4-((E)-{[2-(3,4-dichlorophenyl)-1,3-diketo-2,3-dihydro-1 H-benzo[de]isoquinolin-6-yl]imino}methyl)-1-(2-hydroxyethyl)pyridinium bromide and 2-[(E)-({2-[2-hydroxy-1-(hydroxymethyl)ethyl]-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl}imino)methyl]-3-methyl-1,3-thiazol-3-ium methylsulfate.

2. The cationic naphthalene derivative as defined in claim 1 , selected from the group consisting of 4-{[(E)-[1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}-1-(2-hydroxyethyl)pyridinium bromide, 1-(2-hydroxyethyl)-4{(E)-[2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)iminomethyl}pyridinium bromide, 1-methyl-4-{(E)-[(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}pyridinium methylsulfate and 1-methyl-4-{(E)-[2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}quinolinium methylsulfate.

3. An agent for coloring keratin fibers, comprising at least one cationic naphthalene derivative selected from the group consisting of 4-{(E)-[(1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}-1-(2-hydroxyethyl)pyridinium bromide, 4-{[(E)-[2-{4-[ethyl(2-hydroxyethyl)amino]phenyl}-( 1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}-1-methylpyridinium methylsulfate, 1-(2-hydroxyethyl)-4-{(E)-(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)iminomethyl}pyridinium bromide, 1-methyl-4-{(E)-[(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}pyridinium methylsulfate, 1-methyl-4-{(E)-[(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}quinolinium methylsulfate, 4-[(E)-({2-[2-hydroxy-1-(hydroxymethyl)ethyl]-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl}imino)methylpyridinium methylsulfate, 4-((E)-{2-(3,4-dichlorophenyl)-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-y]imino}methyl)-1-(2-hydroxyethyl)pyridinium bromide, and 2-[(E)-({2-[2-hydroxy-1-(hydroxymethyl)ethyl]-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl}imino)methyl]-3-methyl-1,3-thiazol-3-ium methylsulfate.

4. An agent for brightening and coloring keratin fibers, comprising at least one cationic naphthalene derivative selected from the group consisting of 4-{(E)-[(1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}-1-(2-hydroxyethyl)pyridinium bromide, 4-{[(E)-[2-{4-[ethyl(2-hydroxyethyl)amino]phenyl}-(1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}-1-methylpyridinium methylsulfate, 1-(2-hydroxyethyl)-4-{(E)-(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)iminomethyl}pyridinium bromide, 1-methyl-4-{(E)-[(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}pyridinium methylsulfate, 1-methyl-4-{(E)-[(2-methyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)imino]methyl}quinolinium methylsulfate, 4-[(E)-({2-[2-hydroxy-1-(hydroxymethyl)ethyl-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl}imino)methylpyridinium methylsulfate, 4-((E)-}[2-(3,4-dichlorophenyl)-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl]imino}methyl)-1-(2-hydroxyethyl)pyridinium bromide, and 2-[(E)-({2-[2-hydroxy-1-(hydroxymethyl)ethyl]-1,3-diketo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl}imino)methyl]-1,3-methyl-1,3-thiazol-3-ium methylsulfate.

5. The agent as defined in claim 3 , wherein the agent contains the cationic naphthalene derivative in an amount from 0.01 to 10 weight percent.

6. The agent as defined in claim 3 , further comprising at least one synthetic polymer or a modified polymer of natural origin commonly used in cosmetic agents.

7. The agent as defined in claim 6 , wherein the agent contains the polymer in an amount from 1 to 5 weight percent.

8. The agent as defined in claim 3 , wherein the agent is a hair colorant.

9. The agent as defined in claim 4 , wherein the agent contains the cationic naphthalene derivative in an amount from 0.01 to 10 weight percent.

10. The agent as defined in claim 4 , and further comprising at least one synthetic polymer or a modified polymer of natural origin commonly used in cosmetic agents.

11. The agent as defined in claim 10 , wherein the agent contains the polymer in an amount from 1 to 5 weight percent.