[N+:1]([C:4]1[C:12]([F:13])=[C:11]([F:14])[C:10]([F:15])=[C:9]([F:16])[C:5]=1[C:6](O)=[O:7])([O-:3])=[O:2].C(Cl)(=O)C([Cl:20])=O>CN(C)C=O.ClCCl>[N+:1]([C:4]1[C:12]([F:13])=[C:11]([F:14])[C:10]([F:15])=[C:9]([F:16])[C:5]=1[C:6]([Cl:20])=[O:7])([O-:3])=[O:2]A solution of 6.7 g (28 mmoles) of 2-nitro-3,4,5,6-tetrafluorobenzoic acid [Tetrahedron, 23, 4719, (1967)], 3.8 g (30 mmoles) of oxalyl chloride and 50 ml of dichloromethane was treated with four drops of N,N-dimethylformamide and stirred at room temperature overnight. The solvent was removed and the residue was used as is without further purification.
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