| abstract |
The present invention is directed to novel amino-substituted 2-cumaryl-3'-chromenylium salts of the general formula <IMAGE> wherein R3 and R7 are a dialkyl or cycloalkyl disubstituted amino group, hydrogen, or hydroxy group, provided that at least one of R3 and R7 is an amino group, R1, R2, R4, R5, R6, and R8 are hydrogen, an alkoxy group, or two of these substituents together form an aromatic ring, provided that R1, R2 and R4 may be the same or different, and R5, R6 and R8 may be the same or different, and Y- is an acidic anion and to the process for their preparation. |