| abstract |
Monoazo compounds of the general formula in which A means -NH-CO-NH-, -NH-CO-CO-NH- or -NH-CO-NH - CO-, B means -CO- or -CO-CO-, R 1 , R 2 and R 3 is hydrogen, chlorine, methyl, methoxy, ethoxy, nitro or a group of the formula COOR in which R is hydrogen, methyl or ethyl, and R 4 is hydrogen, chlorine, methyl, methoxy or ethoxy with which Provided that if B means -CO- andn n n n n 1) A represents -NH-CO-NH-, a) R 4 is either different from hydrogen, or b) at least one of the radicals R 1 , R 2 and R 3 represents nitro or COOR, or c) at least two of the radicals R 1 , R 2 and R 3 are different from hydrogen, n n n 2) A represents -NH-CO-CO-NH- or -NH-CO-NH-CO-. a) R 4 is not in the 6 position or b) at least one of the radicals R 1 , R 2 and R 3 is different from hydrogen are obtained if compounds of the general formula diazotized and the diazonium compounds obtained on compounds of the general formula couples. The compounds are colorants and are particularly suitable for pigmenting high molecular weight materials. |