The present application relates to a preparation for dyeing keratin fibers which, before use, is mixed with an oxidizing agent and wherein a combination of at least one 4,5-diaminopyrazole derivative of the general formula (II) or its physiologically compatible salts and at least one phenylurea derivative of the general formula (I) or its physiologically compatible salts is contained in a suitable cosmetic carrier, as well as a method for dyeing hair using this preparation.
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(2008/06/13)
Process for the synthesis of 4,5-diaminopyrazole derivatives useful for dyeing hair
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 R1 and R2 independently designate hydrogen, a C1 - to C6 -