PROBLEM TO BE SOLVED: To provide novel direct dyes for reversibly dyeing keratin fibers while providing excellent dyeing properties.SOLUTION: A compound is prepared which is selected from compounds of leuco type of formula (I), dyes of azomethine type comprising a pyrazolopyridine unit of formula (II) corresponding to the compounds of formula (I), and mesomeric forms, isomeric and tautomeric forms thereof, acid-addition salts thereof and solvates thereof.SELECTED DRAWING: None
要解决的问题:提供新颖的
直接染料,可在为角蛋白纤维进行可逆染色的同时提供优异的染色性能。
解决方案:制备一种化合物,该化合物选自式(I)的
亚胺型化合物、包含与式(I)的化合物对应的
吡唑吡啶单元的偶氮亚甲基型
染料(式(II)),以及其介质式、同分异构体和互变异构体形式、酸加成盐及溶剂化合物。
选定图纸:无