| 摘要 |
The invention relates to compounds of the formula <IMAGE> or their isomer mixtures, in which A represents a quasiaromatic heterocyclic radical, B represents a radical of the formula <IMAGE> n represents 0, 1, 2 or 3, preferably 0-2, R1 represents hydrogen, CN, R or acyl, R2 represents hydrogen, halogen, -OR, -NHR, -N(R')2 or NHCOR, R' represents alkyl and R represents R', alkenyl, aralkyl, cycloalkyl or aryl. They are useful optical brighteners and/or laser dyes and in some cases intermediates for the preparation of these final products.
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