Process for preparing 1,4-diaminonaphthalene and/or 1,5-diaminoNaphthalene

US6538158B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Joachim Zechlin · Neuss, DE
• Lothar Duda · Munster, DE
• Gerhard Wegener · Mettmann, DE
• Andreas Hoffmann · North Bend, US
• Bodo Temme · Munster, DE

Key dates

• Filing date: May 3, 2002
• Grant date: Mar 25, 2003
• Expiry date: May 3, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1,4-diaminonaphthalene and/or 1,5-diaminonaphthalene are produced by (a) reacting naphthalene with a halogen, (b) optionally, separating 1,4-dihalogen naphthalene or 1,5-dihalogen naphthalene from the mixture from step (a), and (c) reacting the mixture from step (a) or the 1,4-dihalogen naphthalene or the 1,5-dihalogen naphthalene from step (b) with ammonia and/or an organic amine in the presence of a catalyst.