Process for the preparation of dialkylthiophenes and alkylenedioxythiophenes

US6369239B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Rauchschwalbe · Leverkusen, DE
• Friedrich Jonas · Aachen, DE

Key dates

• Filing date: Mar 21, 2001
• Grant date: Apr 9, 2002
• Expiry date: Mar 21, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of dialkoxythiophenes and alkylene-dioxythiophenes in high purity and very good yields by decarboxylation of dialkoxythiophene-dicarboxylic acids or alkylenedioxythiophenedicarboxylic acids, respectively, in solvents that have a higher boiling point than the product and contain no nitrogen bases.