| 摘要 |
The invention relates to a process for the preparation of dyestuffs of the formula: <IMAGE> (I) in which R1 represents hydrogen, alkyl, alkenyl or aralkyl, R2 represents alkyl, alkenyl, cycloalkyl, aryl or aralkyl, R3 represents hydrogen, alkyl or alkoxy, R4 represents hydrogen, alkyl, aryl or aralkyl, R5 represents hydrogen or alkyl, R6 represents hydrogen, alkyl or alkoxy, R7 represents hydrogen or alkyl or forms with R6 a condensed benzene ring, and X(-) represents an anion, which process comprises reacting a nitroso compound of formula (II) with an aminophenol of formula (III) or a nitroso compound of formula (IV) with a compound of formula (V): <IMAGE> +TR <IMAGE> in which R1 to R7 have the same meanings as above, R'3, R'6 and R'7 each represents H or alkyl, R8 is a possibly substituted alkyl radical, and R9 is an alkoxy radical or a possibly substituted amino group. The reaction is effected in the presence of an anhydride such as acetic anhydride and the dyestuffs may be prepared without heating with excellent yields. |
