Novel 1,4-diamino-2-(thiazol-2-yl)benzene derivatives and dyes containing said compounds

1,4-Diamino-2-(thiazol-2-yl)benzene derivatives of formula (I)

• 9
• wherein
• R1, R2, R3 and R4 independently of each other denote hydrogen, a C1-C6-alkyl, C2-C4-hydroxyalkyl, C3-C4-dihydroxyalkyl or C2-C4-alkoxy-(C1-C2)-alkyl group or R1 and R2 or R3 and R4 form a four-membered to eight-membered aliphatic ring, and at least two of the R1 to R4 groups denote hydrogen;
• R5 denotes hydrogen, a halogen atom, a C1-C4-alkyl, C1-C4-hydroxyalkyl or C1-C4-alkoxy group;
• R6 and R7 independently of each other denote hydrogen, a halogen atom, a nitro, C1-C4-alkoxy, C1-C6-alkyl, C1-C4-hydroxyalkyl or C3-C4 dihydroxyalkyl group or a group of formula (II)
• 10
• and R8 denotes hydrogen, an amino group, a halogen atom, a nitro group or a hydroxyl group.