| 摘要 |
Novel 4-heterocyclylvinyl-4'-styryl-biphenyls of the formula <IMAGE> are described, i which A is an isoxazolyl, oxadiazolyl, pyrimidinyl or triazinyl radical which is unsubstituted or substituted by a non-chromophoric substituent, R1 is hydrogen or a non-chromophoric substituent and R2 is hydrogen, halogen, or alkyl; processes for the preparation of these compounds are also described. The novel 4-heterocyclylvinyl-4'-styryl-biphenyls can be used as fluorescent brighteners for high-molecular organic materials, in particular materials of polyamide and polyester, especially for polyester textiles.
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