F[C:2]1[C:7]([C:8]([OH:10])=[O:9])=[C:6]([F:11])[C:5]([C:12]([OH:14])=[O:13])=[C:4]([F:15])[C:3]=1[F:16].[CH3:17][Mg]Cl>C1COCC1>[F:11][C:6]1[C:5]([C:12]([OH:14])=[O:13])=[C:4]([F:15])[C:3]([F:16])=[C:2]([CH3:17])[C:7]=1[C:8]([OH:10])=[O:9]20 g of tetrafluoroisophthalic acid are initially charged in 250 ml of THF and, at from 20 to 40° C., admixed with 88 ml of a 3 molar methylmagnesium chloride solution. Customary aqueous work-up (see Example 3) gives 20.1 g of 2,4,5-trifluoro-6-methylisophthalic acid. The purity of the product is 85% by HPLC.
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