Process for the preparation of 2-substituted-1,4-benzenediamines and salts thereof

US9758469B2 · kind B2 · utility

Assignee

• NOXELL CORPORATION · US

Inventors

• Garry Steven Garrett · Lancaster, US
• Heike Gertrud Abel · Eiterfeld, DE
• Armin Osan · Darmstadt, DE
• John Michael Gardlik · Cincinnati, US
• Bryan Patrick Murphy · Loveland, US
• Markus Speckbacher · Aschaffenburg, DE
• Ingo Weber · Basel, CH

Key dates

• Filing date: Oct 29, 2015
• Grant date: Sep 12, 2017
• Expiry date: Oct 29, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C245/24
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of 2-substituted-1,4-benzenediamines, a cosmetically acceptable salt thereof, or mixture thereof. The process according to the present invention is a particularly cost effective process in that it avoids sophisticated chemical steps which requires special equipment or expensive catalysts and in that it comprises a recycling step of one of the starting materials, namely the 2-substituted aniline.