| 摘要 |
Disclosed are compounds of Formula I, <IMAGE> I where either R1, R2, R3 and R4, independently, are hydrogen, C1-4alkyl, C1-4alkoxy, halogen, cyano, carboxy, alkoxy(C1-4)carbonyl, -CONR6R7, -SO2NR6R7, -SO2R8, alkyl(C1-4)carbonyloxy, or C1-4alkoxy monosubstituted by phenyl, alkoxy(C1-4)carbonyl, cyano, carboxy or -CONR6R7, with the proviso that a maximum of one of R1 and R2 and a maximum of one of R3 and R4 can signify a group selected from cyano, carboxy, alkyl (C1-4)carbonyloxy, -CONR6R7, -SO2NR6R7 and -SO2R8, or one or both pairs R1 and R2, and R3 and R4, are on adjacent carbon atoms and form a fused benzene ring, any pair not forming a ring being as defined above, R5 is C1-4alkyl, unsubstituted or mono-substituted by hydroxy, cyano, phenyl, C2-4alkenyl, carboxy, C1-4alkoxycarbonyl or -CONR6R7; or unsubstituted phenyl, R6 and R7, independently, are hydrogen or C1-4alkyl, R8 is C1-4alkyl, and X is O or S, in free base, acid addition salt or quaternary ammonium salt form, their production and use as optical brightening agents for polyacrylonitrile. |
