C([O:3][C:4](=[O:19])[C:5]([C:9]1[CH:14]=[CH:13][C:12]([C:15]([F:18])([F:17])[F:16])=[CH:11][CH:10]=1)=[C:6]([Cl:8])[Cl:7])C.O1CCCC1.[OH-].[Li+].Cl>O>[Cl:7][C:6]([Cl:8])=[C:5]([C:9]1[CH:10]=[CH:11][C:12]([C:15]([F:16])([F:17])[F:18])=[CH:13][CH:14]=1)[C:4]([OH:19])=[O:3]P1.2): 650 mg of 3,3-dichloro-2-(4-trifluoromethyl-phenyl)-acrylic acid ethyl ester are introduced into 4 ml of tetrahydrofuran. 100 mg of lithium hydroxide in 1.5 ml of water are then added and the mixture is stirred at room temperature for 16 hours. After a further 4 hours at 40° C., the reaction mixture is poured into water, rendered acidic with concentrated hydrochloric acid and extracted with ethyl acetate. The organic phases are washed twice with water and concentrated. 3,3-Dichloro-2-(4-trifluoromethyl-phenyl)-acrylic acid is obtained.
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