Process for the preparation of stilbenedicarboxylate derivatives

US4789755A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Dale E. Van Sickle · Kingsport, US
• John C. Morris · Berea, US
• Marvin A. McCall · Cape Coral, US
• Jean Carroll Fleischer · Kingsport, US
• Ted R. Walker, Jr. · Kingsport, US

Key dates

• Filing date: Oct 7, 1987
• Grant date: Dec 6, 1988
• Expiry date: Oct 7, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Disclosed is a process for producing dimethyl or novel diphenyl derivatives of stilbenedicarboxylic acids from dimethyl toluates or diphenyl toluates and sulfur. The reaction requires an excess of toluate to sulfur of at least about 5:1. In addition hydrogen sulfide is removed from the reaction zone.