| 摘要 |
<p>Anionic monoazo dyes of the formula (1) in which A represents 1- or 2-naphthyl residue, which is substituted by a total of one or two sulphonic and/or carboxylic acid groups. R<SUB>1 </SUB>represents hydrogen or C<SUB>1</SUB>-C<SUB>4</SUB>alkyl, each D<SUB>1 </SUB>and D<SUB>2</SUB>, independently of the other, represent either an amino acid residue resulting from removal of a hydrogen atom from the amino group of the amino acid or the residue -NR<SUB>2</SUB>R<SUB>3</SUB>, in which each R<SUB>2 </SUB>and R<SUB>3</SUB>, independently of the other, represent hydrogen, C<SUB>1</SUB>-C<SUB>4</SUB>alkyl, C<SUB>2</SUB>-C<SUB>6</SUB>alkyl which is substituted by hydroxy, halogen or cyano, phenyl which is unsubstituted or monosubstituted by hydroxy, halogen, SO<SUB>3</SUB>H, C<SUB>1</SUB>-C<SUB>4</SUB>alkyl or C<SUB>1</SUB>-C<SUB>4</SUB>alkoxy or alternatively, R<SUB>2 </SUB>and R<SUB>3</SUB>, together with the nitrogen atom to which they are connected, complete a saturated 5- or 6-membered ring which may contain, in addition to the nitrogen atom, one nitrogen or oxygen atom and which may be further substituted and n is 0 or 1, a process for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper</p> |
