Hydrogenation of halonitroaromatic compounds

US5801284A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Franz-Josef Mais · Düsseldorf, DE
• Klaus-Christian Paetz · Burscheid, DE
• Helmut Fiege · Leverkusen, DE
• Heinz U. Blank · Odenthal, DE
• Dieter Brueck · Bonn, DE
• Wolf Mehl · Neunburg vorm Wald, DE

Key dates

• Filing date: Feb 5, 1997
• Grant date: Sep 1, 1998
• Expiry date: Feb 5, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D231/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing haloaromatic amines by catalytic hydrogenation of the corresponding halonitroaromatic compounds, characterized in that iron-containing Raney nickel is used as catalyst, where the haloaromatic amines prepared can be used for the synthesis of photographic couplers which are useful in photographic emulsions or elements.