Wella Aktiengesellschaft

Wella Aktiengesellschat

Hans Neunhoeffer

Thomas Clausen

Wolfgang R Balzer

Stefan Gerstung

Ute Kern

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.

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

Composition for the oxidative dyeing of hair containing

The hair dye composition includes at least one N-phenylaminopyrazole compound of the formula (V) ##STR1## wherein R.sup.1 is hydrogen, an alkyl group having from one to four carbon atoms or a hydroxyalkyl group having from two to four carbon atoms; R.sup.2 and R.sup.3 are each independently either a hydrogen, an amino groups or an alkyl group having from one to four carbon atoms; and R.sup.4 is hydrogen, an alkyl group having from one to four carbon atoms, an alkoxy group having from one to four carbon atoms or a halogen; and at least one conventional ingredient for hair dye compositions selected from the group consisting of emollients; preservatives; perfume oils; solvents; anionic, cationic, amphoteric and nonionic surfactants; thickeners; starch derivatives; cellulose derivatives; petrolatum; paraffin oil; fatty acids; conditioners; lanolin derivatives; cholesterol; pantothenic acid and betaines.

N-phenylaminopyrazole derivatives as well as composition and process for

Hair dye containing aminopyrazole derivatives as well as pyrazole

Oxidation hair dye composition containinng diaminopyrazol derivatives

Growing community of inventors

Muhltal, Germany

Hans Neunhoeffer