Patent ID: 6462218
Filing Date: 2002-10-08
Classification: C07C

Abstract:
Process for preparing 3-cyano-2,4-dihalogeno-5-fluorobenzoic acids of the formula (I) â€ƒin which X and Y independently of one another each represent halogen by hydrolytic cleavage of a) 3-cyano-2,4-dihalogeno-5-fluorobenzamides of the formula (II) â€ƒin which X and Y independently of one another each represent halogen, or b) 1,3-dicyano-2,4-dihalogeno-5-fluorobenzenes of the formula (III) â€ƒin which X and Y independently of one another each represent halogen, or c) 3-cyano-2,4-dihalogeno-5-fluorobenzoic esters of the formula (IV) â€ƒin which X and Y independently of one another each represent halogen and R represents C1-4-alkyl which may optionally be substituted.