Process for preparing substituted benzoyl chlorides

US6844468B2 · kind B2 · utility

Assignee

• Clariant Corporation · DE

Inventors

• Lars Bierer · Liederbach, DE
• Joachim Ritzer · Rodenbach, DE
• Berthold Schiemenz · Frankfurt am Main, DE
• Thomas Wessel · Frankfurt, DE

Key dates

• Filing date: Oct 3, 2002
• Grant date: Jan 18, 2005
• Expiry date: Oct 3, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/58
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing substituted benzoyl chlorides of the formula (1) where R, x and y have the meaning given below, which comprises reacting a benzaldehyde of the formula (2) where R, independently of each other, is identical or different and is an unsubstituted phenyl radical or a phenyl radical that is substituted by halogen, NO2, CN, (C1-C4)alkyl or (C1-C4)alkoxy, or is halogen, NO2, CN, NR′2, OR′, SO2R′, SO2OR′, COR′ or CO2R′, where R′ is an unbranched or branched C1-C10 alkyl radical, an unsubstituted phenyl radical or a phenyl radical which is substituted by halogen, NO2, CN, (C1-C4)alkyl or (C1-C4)alkoxy, x is 1 or 2 and y is 1, 2 or 3, with a chlorinating agent in the presence of a free-radical initiator and a solvent at from −20 to +200° C.