Diphenyl Ether → Methyl-5-(2-chloro-4-cyano-6-fluoro-phenoxy)-2-nitro-benzoate

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Reaction Steps

The product 3-chloro-4,5-difluorobenzonitrile, prepared for example as set forth in Example 3, above, is a useful intermediate for the preparation of various end products especially for the preparation of diphenyl ether herbicides. Thus, for example, this compound may be further reacted with the potassium salt of methyl-5-hydroxy-2-nitrobenzoate in a solvent, such as N-methyl-2-pyrrolidone at a temperature of about 120° to 180° Celsius to form methyl-5-(2-chloro-4-cyano-6-fluoro-phenoxy)-2-nitro-benzoate. The ester may be hydrolyzed in a conventional manner to the corresponding carboxylic acid.

Provenance & Evidence