PREPARATION OF 2-CHLORO-4-FLUORO-5-NITROBENZOIC ACID

Abstract

The present invention relates to a novel nitration process of 2-chloro-4-fluorobenzoic acid or alkyl 2-chloro-4-fluorobenzoate, using oleum and nitric acid, to obtain 2-chloro-4-fluoro-5-nitrobenzoic acid or alkyl 2-chloro-4-fluoro-5-nitrobenzoates; purifying the crude reaction product; and recovering 2-chloro-4-fluoro-5-nitrobenzoic acid or alkyl 2-chloro-4-fluoro-5-nitrobenzoates in an essentially pure form, which can be used in the synthesis of the herbicide saflufenacil.

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