[CH3:1][C:2]1[C:10]([F:11])=[C:9]([F:12])[CH:8]=[C:7]([F:13])[C:3]=1[C:4](O)=[O:5].[Cl-:14]>>[CH3:1][C:2]1[C:10]([F:11])=[C:9]([F:12])[CH:8]=[C:7]([F:13])[C:3]=1[C:4]([Cl:14])=[O:5]To 2-methyl-3,4,6-trifluorobenzoic acid (3.2 g) is added thiony chloride (7 ml) and the mixture is refluxed for hour. After concentrating, 2-methyl-3,4,6-trifluorobenzoyl chloride (3.3 g) is obtained.
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