Substituted ortho-aminophenols, process for preparing them and their use for the oxidatin dyeing of keratinous fibres

US5145483A · kind A · utility

Assignee

• L'Oreal · FR

Inventors

• Alex Junino · Livry-Gargan, FR
• Herve Andrean · Paris, FR
• Gerard Lang · Saint-Gratien, FR

Key dates

• Filing date: Oct 27, 1989
• Grant date: Sep 8, 1992
• Expiry date: Oct 27, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C271/28
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

5-Substituted ortho-aminophenols of formula: ##STR1## in which: R.sub.1 denotes a hydrogen atom, an alkyl radical having 1 to 4 carbon atoms or a hydroxyalkyl radical having 1 to 4 carbon atoms; and PA0 R.sub.2 denotes, independently of R.sub.1, an alkyl radical having 1 to 4 carbon atoms, an alkoxy radical having 1 to 4 carbon atoms or a benzyl radical; the addition salts with an acid and the phenates, and PA0 dyeing composition containing a compound of formula (I) or a salt or a phenate of such a compound. The 5-substituted ortho-aminophenols enable hair to be dyed in a rich spectrum of hues having good durability.