| abstract |
Compounds of the formula <IMAGE> wherein each of R and R1 is independently hydrogen, C1-4alkyl, phenyl or phenyl substituted by 1 to 3 C1-4alkyl, C1-4alkoxy or halo substitutents or R and R1 taken together are trimethylene or tetramethylene, each of R2 and R3 is independently allyl, C1-4alkyl, phenyl (C1-4alkyl) or C2-4alkyl monosubstituted by hydroxy, cyano or carbamoyl, <IMAGE> wherein R5, R6, R7 and R8 are as defined in the specification, and A(-) is an anion, and mixtures thereof with cationic 5-hydroxypyrazole dyes, are useful for dyeing and printing materials dyeable with basic dyes, e.g., homopolymers and copolymers of acrylonitrile and asymmetrical dicyanoethylene, polyamides and polyesters modified to contain acidic groups, leather and paper. |