Bis-pyrazole aza compounds, processes for making them, and hair dye compositions containing these compounds

US5865855A · kind A · utility

Assignee

• Wella GmbH · DE

Inventors

• Annelie Doehling · Munster, DE
• Wolfram Geibel · Nettetal, DE
• Otto Goettel · Marly, CH

Key dates

• Filing date: Jun 24, 1998
• Grant date: Feb 2, 1999
• Expiry date: Jun 24, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B23/164
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The new bis-pyrazole aza compounds have the formula (I): ##STR1## wherein R.sub.1, R.sub.1 ', R.sub.2, R.sub.2 ', R.sub.3 and R.sub.3 ' are the same or different, and are each, independently of each other, H, a straight, branched or cyclic alkyl group having 1 to 6 carbon atoms, a straight chain or branched monohydroxyalkyl group or polyhydroxyalkyl group with 1 to 6 carbon atoms, a straight or branched alkoxyalkyl group with 2 to 6 carbon atoms, a straight or branched monoaminoalkyl group or polyaminoalkyl group with 2 to 6 carbon atoms, or an unsubstituted aromatic or heteroaromatic ring, or a substituted aromatic or heteroaromatic ring having one or more halogen, a C.sub.1 - to C.sub.4 -alkyl group, a nitro group, a sulfonic acid group, a carboxylic acid group or a C.sub.1 - to C.sub.4 -alkoxy substituent, or an unsubstituted benzyl group, or a benzyl group substituted with one or more halogen atom, a hydroxy group, a C.sub.1 - to C.sub.4 - alkyl group, a nitro group or a C.sub.1 - to C.sub.4 -alkyoxy group, or R.sub.1 together with R.sub.2 and/or R.sub.1 ' together with R.sub.2 ' represent a C.sub.3 -diradical bridge. Hair dye compositions containing these new dye compounds and…