Process for the preparation of thiophene derivatives

US5100520A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Steffen Dapperheld · Hofheim, DE
• Michael Feldhues · Bad Soden am Taunus, DE
• Heinz Litterer · Schlangenbad, DE
• Frank P. Sistig · Hofheim, DE
• Peter Wegener · Königstein, DE

Key dates

• Filing date: Feb 2, 1990
• Grant date: Mar 31, 1992
• Expiry date: Feb 2, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25B3/25
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Selectively dehalogenated thiophene derivatives are obtained from compounds of the formula II ##STR1## by an electrochemical reaction in a divided electrolysis cell in the presence of a suitable solvent, an onium compound or a compound which is converted into an onium compound in the electrolyte, and a conducting salt. Thiophene derivatives are important intermediates in the production of pharmaceuticals and plant protection agents.