Method for producing o-chloromethyl benzoic acid chlorides

US6727385B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Roland Götz · Ludwigshafen, DE
• Norbert Gotz · Worms, DE
• Michael Keil · Freinsheim, DE
• Bernd Wolf · Niederkirchen, DE
• Adrian Steinmetz · Mannheim, DE
• Armin Stamm · Mainz, DE
• Jochem Henkelmann · Mannheim, DE

Key dates

• Filing date: Aug 12, 2002
• Grant date: Apr 27, 2004
• Expiry date: Aug 12, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing o-chloromethylbenzoyl chlorides of the formula I, in which R1 to R4 can be identical or different and are hydrogen, C1-C4-alkyl, halogen or trifluoromethyl, by reacting benzo-fused lactones of the formula II, in which R1 to R4 are as defined above, with thionyl chloride, which comprises carrying out the reaction in the presence of catalytic amounts of boric acid, boric anhydride, borate, boronic acid or boronic acid esters and catalytic amounts of a quaternary ammonium salt is described.