| 摘要 |
Azo dyestuffs of the formula <IMAGE> (I) wherein R1 represents hydrogen or in some cases alkyl, aralkyl, aryl or cycloalkyl, R2 represents hydrogen or in some cases alkyl, alkenyl or aralkyl, R3 represents, inter alia, hydrogen, alkyl, halogen or cyano and D represents the radical of a diazo component, are suitable for dyeing synthetic textile materials, in particular those made of polyethylene terephthalate. The scarlet-colored to blue dyeings obtained, in particular, with the preferred dyestuffs of the formula I, wherein D represents a o,o'-dicyanobenzene radical, are distinguished by good general fastness properties, good depth of color and a particularly clear color shade.
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