| 摘要 |
Compounds of the formula <IMAGE> (I) in which R1, R2 and R3 denote hydrogen, alkyl, alkoxy or halogen, A denotes aryl or a radical of the formula <IMAGE> wherein R8 denotes aryl, alkyl, aralkyl, styryl or alkoxy, R9 denotes hydrogen, CN, COOR, CONRR' or R8 and X denotes N or C(R10), R4 and R10 denote hydrogen, alkyl or aryl, R5, R6 and R7 denote hydrogen, halogen or alkyl, inter alia, R denotes alkyl and R' denotes R or H, are valuable optical brighteners for polyesters, polyamides, cellulose esters and polyacrylonitrile.
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