| abstract |
Disclosed are compounds of formula (1a), wherein R 1 is N + R 8 R 9 ; R 8 and/or R 9 independently from each other are hydrogen; C 1 -C 12 alkyl; or phenyl-C 1 -C 4 -alkyl; or R 8 and/or R 9 are a bivalent C 3 -C 6 alkylene radical which is linked to the carbon atoms C 1 or C 2 respectively and, together with the linking nitrogen atom form a 6 to 16-membered carbocyclic ring; R 2 is NR 10 R 11 ; or OR 10 ; R 10 and R 11 , independently from each other are hydrogen; C 1 -C 12 alkyl; or phenyl-C 1 -C 4 alkyl; or R 10 and/or R 11 are a bivalent C 3 -C 6 alkylene radical which is linked to the carbon atoms C 3 or C 4 respectively and, together with the linking nitrogen or oxygen atom form a 6 to 16-membered carbocyclic ring; or R 10 and R 11 together with the linking nitrogen atom form a 4 to 8 membered carbocyclic ring; R 3 , R 4 , R 5 , R 6 and R 7 independently form each other are hydrogen; C 1 -C 12 alkyl; halogen; NR 12 R 13 ; or a radical of formula (1a); R 12 and R 13 independently from each other are hydrogen; C 1 -C 12 alkyl; phenyl-C 1 -C 4 alkyl; or a radical of formula (1a 2 ); V is —O—; Or —NR 15 ; R 14 , R 15 R- 16 and R 17 independently from each other are hydrogen; or C 1 -C 5 alkyl; and Hal is a halogen atom; and wherein at least one of R 3 , R 4 , R 5 , R 6 and R 7 is hydrogen. The compounds are useful for dyeing of keratin-containing fibres with or without reducing agents. |