| abstract |
The coupler for coloring hair in the oxidation dyeing of hair is a compound of the following formula (1): Embedded image Wherein X is selected from halogen and R 5 SO 4 ; R, R 1 , R 2 and R 5 are each independently a C 1 -C 22 alkyl and a C 1 -C 22 mono or dihydroxyalkyl And R 3 and R 4 are each independently a C 1 -C 6 alkyl group, a C 1 -C 6 hydroxyalkyl group, a C 1 -C 6 alkoxy group, a C 1 -C 6 aminoalkyl Selected from the group or R 3 and R 4 together form a C 1 -C 5 alkylene group. |