Process for the isomerization of halogenated thiophenes

US4604470A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Klaus Eichler · Laufenburg (Baden), DE
• Ernst I. Leupold · Neu-Anspach, DE

Key dates

• Filing date: May 23, 1985
• Grant date: Aug 5, 1986
• Expiry date: May 23, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D333/28
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the isomerization of halogenated thiophenes on zeolite catalysts. In this manner, in particular, 2-chlorothiophene is isomerized to 3-chlorothiophene and 2-bromothiophene is isomerized to 3-bromothiophene. Particularly suitable zeolites are synthetic zeolites of the pentasil, mordenite or faujasite type in their acid form.