The subject matter of the present invention is directed to a process for producing 4,5-diaminopyrazole derivatives of the general formula (I) ##STR1## where R.sub.1 and R.sub.2 independently designate hydrogen, a C.sub.1 - to C.sub.6 -alkyl radical or a C.sub.2 - to C.sub.4 -hydroxyalkyl radical, which can be used as dye precursors, for example for hair dyes, and to new pyrazole derivatives. When using the process according to the invention good yields of isomer-pure 4,5-diaminopyrazole derivatives of general formula (I) can be obtained.
本发明的主题是一种生产4,5-
二氨基吡唑衍
生物的方法,其通式为(I)##STR1##其中R.sub.1和R.sub.2独立地指氢、C.sub.1-C.sub.6烷基基团或C.sub.2-C.sub.4羟基烷基基团,可用作
染料前体,例如用于染发剂,并提供了新的
吡唑衍
生物。使用本发明的方法可以获得通式(I)的异构体纯度良好的4,5-
二氨基吡唑衍
生物的良好收率。