| 摘要 |
Fluorescent dyestuffs of the general formula <IMAGE> wherein R and R1 independently of one another represent hydrogen, a salt-forming cation, an alkyl radical with 1 to 16 C atoms or an aryl or aralkyl radical which is optionally substituted by non-chromophoric groups, R2 to R5 independently of one another represent hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, alkenoxy, aryloxy, halogen or a carboxyl, cyano, alkyl sulphone, aryl sulphone, aralkyl sulphone, carboxamide, sulphonamide or carboxylic acid ester group, o, p, q and s independently of one another represent 1 or 2 and m and n independently of one another denote 0, 1 or 2, it being possible for the sum of m and n to be 2 to 4, processes for their preparation and their use as laser dyestuffs.
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