Process for the synthesis of 4,5-diaminopyrazole derivatives use

Details Process for the synthesis of 4,5-diaminopyrazole derivatives use Process for the synthesis of 4,5-diaminopyrazole derivatives use

1996-05-20

1997-09-02

Ramsuer, Robert W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5483725, C07D23138

Patent

active

056633661

ABSTRACT:
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.

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