申请人:Wella Aktiengesellschat
公开号:US05663366A1
公开(公告)日:1997-09-02
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.
本发明涉及一种制备4,5-二氨基吡唑衍生物的方法,其通式为(I) ##STR1##其中R1和R2独立地表示氢、C1-C6烷基或C2-C4羟基烷基,可用作染料前体,例如用于染发剂,以及新的吡唑衍生物。使用本发明的方法可以获得通式(I)的同分异构体纯度高的良好产率。