The new compounds of the general formula
where R1 is hydrogen, alkyl or cyclic alkyl, R2 and R3 are each hydrogen, alkyl, a carboxylic acid, ester or amide group or cyano, and R.. Rs and R6 are each alkyl or aryl, are useful as antihalation dyes and as image dyes in photographic materials for dye-bleaching processes.
通式如下的新化合物
其中 R1 是氢、烷基或环烷基,R2 和 R3 分别是氢、烷基、
羧酸基、酯基或酰胺基或
氰基,R.Rs 和 R6 各为烷基或芳基,可用作防褪色
染料和用于
染料漂白工艺的照相材料中的图像
染料。