Methods of stabilizing thiophene derivatives

US7449588B2 · kind B2 · utility

Assignee

• H.C. STARCK INC. · US

Inventors

• Friedrich Jonas · Aachen, DE
• Klaus Wussow · Netphen, DE
• Knud Reuter · Krefeld, DE

Key dates

• Filing date: May 4, 2007
• Grant date: Nov 11, 2008
• Expiry date: May 4, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D495/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Methods of stabilizing thiophene derivatives of the general formula (I) by treatment with basic compounds:wherein R1 and R2 each independently represents a moiety selected from the group consisting of hydrogen, optionally substituted C1-20 alkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, optionally substituted C1-20 oxyalkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, or wherein R1 and R2 together represent a fused cyclic moiety selected from the group consisting of optionally substituted C1-20 dioxyalkylene groups and C1-20 dioxyarylene groups; and stabilized thiophene derivatives that can be prepared by such methods.