Patent ID: 8329939
Filing Date: 2012-12-11
Classification: C07C

Abstract:
1. A process for the preparation of 3-chloro-2-fluoro-5-trifluoromethyl benzoic or of a salt thereof, comprising the steps of a) converting the 3-chloro-4-fluoro-benzo trifluoride of formula II, b) into an alkali (3-chloro-2-fluoro-5-trifluoromethyl-phenyl)-hydroxy-methanesulfonate of formula IV, wherein M is an alkali metal atom; b) transforming the alkali (3-chloro-2-fluoro-5-trifluoromethyl-phenyl)-hydroxy-methanesulfonate of formula IV into the 3-chloro-2-fluoro-5-trifluoromethyl benzaldehyde of formula III, and c) oxidizing the 3-chloro-2-fluoro-5-trifluoromethyl benzaldehyde of formula III with an oxidant to form the 3-chloro-2-fluoro-5-trifluoromethyl benzoic acid of formula I or of a salt thereof.