反应详情

The procedure as described in Example 1 is followed, but only 9 g of a mixture of various aliphatic trialkylamines each having 6 to 14 carbon atoms in the alkyl radical (Hostarex A 327; a commercial product of Hoechst AG) and 518 g of an aqueous solution which contains 29.8 g (0.126 mol) of 4-hydroxy-3,5,6-trifluorophthalic acid in the form of corresponding alkali metal salts are used and, with addition of in total 158.3 g of 30% strength aqueous hydrochloric acid, likewise in 6 hours, 23.25 g (95.9% of theory) of 3-hydroxy-2,4,5-trifluorobenzoic acid are obtained.