| abstract |
The invention relates to compounds which, in the form of the free acids, correspond to the general formula I <IMAGE>, in which A is a radical of the formula <IMAGE>, the radicals Y independently of one another are hydroxyl or amino, X is hydrogen, hydroxysulfonyl or a radical of the formula DN = N and R are the rest of 1-aminophthalene-4-, -5-, -6-, -7- or -8-monosulfonic acid or 1-aminonaphthalene-3,6-, -3,7-, -3,8 -, -4,7-or -4,8-disulfonic acid, and their Cu, Fe, Ni, Co, Mn or Cr complexes, where D is phenyl optionally substituted by methyl, methoxy, ethoxy, nitro, chlorine, bromine or sulfo or naphthyl substituted by sulfo. The compounds according to the invention are preferably suitable for dyeing leather. |