Process for the synthesis of 4,5-diaminopyrazole derivatives useful for
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.
Diaminopyrazole compounds and the use thereof in the oxidation dyeing of keratinous fibres
申请人:——
公开号:US20040143909A1
公开(公告)日:2004-07-29
The invention relates to novel diaminopyrazole having formula (I), wherein: R
1
, R
2
, identical or different, represent a C
3
C
5
mono- or polyhydroxyalkyl, isopropyl, n-propyl or ethyl group, said groups being linear or branched, and their physiologically acceptable salts. The invention also relates to a composition for dyeing keratinous fibres containing a compound having formula (I) and the method for using same.
1