Hans Schwarzkopf Gmbh & Co. Kg

Other

Cassella Aktiengesellschaft

Andreas Joachim Bittner

Mustafa Akram

Wolfgang Bauer

Astrid Kleen

Wolfgang Wolff

Uwe Kobs

Klaus Delpy

Diaminoalkane and oxidation colorants

Compounds of the formula (I) and their salts with inorganic and organic acids, ##STR1## in which R.sub.1 is a hydrogen atom or a trimethylsilyl group, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 are, independently of each other, a hydrogen atom, a (C.sub.1 -C.sub.4) alkyl group, a hydroxy-(C.sub.2 -C.sub.3) alkyl group, an alkoxy-(C.sub.2 -C.sub.3) group, an amino-(C.sub.2 -C.sub.3) group, or a 2,3-dihydroxypropyl group, and in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are not simultaneously hydrogen atoms, and processes for their preparation and use as hair-coloring agents.

Substituted diaminophenols, process for their preparation, and hair dyes

4-(2,4-diaminophenoxymethyl)-1,3-dioxolane secondary intermediates,

Substituted diaminophenols, and hair dyes containing such compounds

The present invention relates to a process for the preparation of compounds of the general formula I ##STR1## by reaction of compounds of the general formula II ##STR2## with compounds of the general formula III ##STR3## in inert aprotic solvents in the presence of a base and subsequent rearrangement of the resulting intermediate compound with an alkali metal hydroxide, characterized in that the intermediate compound is not isolated.

Process for the preparation of hydroxyalkylaminonitrobenzene derivatives

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Offenbach, Germany

Andreas Joachim Bittner