Polyhalogen-substituted cinnamic acids and cinnamic acid derivatives and a process for the preparation of polyhalogen-substituted cinnamic acids and cinnamic acid derivatives

US6956129B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Lange · Cologne, DE
• Joachim Komoschinski · Neunburg vorm Wald, DE
• Markus Eckert · Bad Mergentheim, DE
• Michael Dockner

Key dates

• Filing date: Feb 12, 2002
• Grant date: Oct 18, 2005
• Expiry date: Jul 20, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/363
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Polyhalogenated cinnamic acids and cinnamic acid derivatives are prepared by reacting diazonium salts accessible from polyhalogenated anilines with acrylic acid or acrylic acid derivatives in the presence of a homogeneous, palladium-containing catalyst at about −5 to about +100° C. Some of the cinnamic acids and cinnamic acid derivatives obtainable in this way are new. Cinnamic acids and cinnamic acid derivatives which can be prepared according to the invention can be used for the preparation of indanones which are precursors for agro- and pharmaceutical chemicals and for substances having liquid-crystalline properties.