Method for the production of perylen-3,4:9,10-tetracarboxylic acid diimides and perylen-3,4:9,10-tetracarboxylic acid dianhydride and naphtalene-1,8-dicarboxylimides

US7393956B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Bernhard Dung · Havelsee, DE
• Felix Mueller · Bischofswerda, DE
• Arno Boehm · Mannheim, DE
• Willi Helfer · Friedelsheim, DE
• Volker Weyrauch · Deidesheim, DE
• Georg Henning · Ludwigshafen, DE

Key dates

• Filing date: Apr 15, 2003
• Grant date: Jul 1, 2008
• Expiry date: Oct 4, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B57/08
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing perylene-3,4:9,10-tetracarboxylic diimides of the general formula Icomprising in a reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base and subsequently reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide in the presence of a polar solvent.