| abstract |
Compounds represented, in the form of free acid, by the following general formula (I): …<CHEM>… (wherein R3 and R4 are each hydrogen or a methyl, ethyl, methoxy, ethoxy, acetylamino, propionylamino, benzoylamino or ureido group, and R5 and R6 are each hydrogen or a methyl or methoxy group), R1 and R2 are each hydrogen or a methyl, ethyl or sulfomethyl group, X1 and X2 are each hydrogen, chlorine or a methyl, methoxy, carboxyl or sulfonic acid group, m is a number of 0, 1 or 2, and n is a number of 1 or 2, provided that the sum of m and n is 1, 2 or 3). Process for their preparation. These compounds are capable of dyeing cellulose fibers yellow with excellent color fastness to hypochlorite, light, perspiration and sunlight and high acid stability. |