Couplers for use in oxidative hair dyeing
Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R1 and R2 are each individually selected from a hydrogen atom, a C1 to C3 alkyl group, a C1 to C5 mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R1 and R2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
The Procter & Gamble Company
C A A C A C C A A A
C07D A61K A61K C07C A61Q C07C C07C A61K A61K A61K
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Mu-Ill Yuh-Guo James S.
Lim Pan Anderson