Process for manufacturing aromatic diamines

US4005143A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Bohm · Leverkusen, DE
• Helmuth Kritzler
• Lutz Neumann · Neufahrn, DE

Key dates

• Filing date: Jul 9, 1975
• Grant date: Jan 25, 1977
• Expiry date: Jul 9, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/36
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aromatic diamines having the formula ##STR1## wherein R is alkyl or alkoxy having up to 6 carbon atoms are prepared by treating dinitro compounds having the formula ##STR2## wherein R is as previously defined, with hydrogen in the presence of one or more noble metals from the platinum or palladium groups as catalysts, optionally on catalyst supports, and in the presence of optionally substituted aniline as the solvent. The catalyst is generally used in amounts of 0.0005 to 0.1% by weight based on the amount of dinitro compound employed.