| 摘要 |
A cationic azo dye of the formula <IMAGE> (I), wherein n is 0 or 1, Z represents a divalent radical which completes the ring A to form a 5- or 6-membered ring which can carry a fused and substituted or unsubstituted benzene ring and contain nitrogen, oxygen and/or sulphur atoms as ring atoms, Y represents a substituted or unsubstituted alkyl or aryl radical or preferably a hydrogen atom, X(-) represents an anion, R1 represents a substituted or unsubstituted alkyl or aryl radical, R2 represents a substituted or unsubstituted alkyl or benzyl radical, R3 represents a substituted or unsubstituted alkyl, aralkyl or aryl radical, R4 represents a group of the formulae -CN, -CONR5R6 and -COOR7, wherein R5 and R6 represent hydrogen atoms or substituted or unsubstituted alkyl, aralkyl or aryl radicals, and R7 represents a substituted or unsubstituted alkyl or aryl radical, and R8 represents a substituted or unsubstituted alkyl or benzyl radical. The new dyestuffs dye polyacrylonitrile fibers in fast yellow shades.
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