| 摘要 |
The invention relates to a process for the preparation of azo dyes of the formula <IMAGE> or mixtures thereof, in which Ar is a substituted or unsubstituted phenyl, naphthyl or aromatic heterocyclic radical and Y is a group of the formula -O-R, -S-R or <IMAGE> in which R is a substituted or unsubstituted alkyl, aryl or heterocyclic radical and R1 and R2 independently of one another are hydrogen or a substituted or unsubstituted alkyl, aryl or heterocyclic radical, and the groups R1 and R2, together with the nitrogen atom to which they are bonded, can form a ring. The process comprises first coupling dimeric malonodinitrile with a diazo component and cyclizing the resulting intermediate with an alcohol, thioalcohol or amine.
|
