[Cl:1][CH:2]([C:7]1([C:16]([F:19])([F:18])[F:17])[O:11][C:10]2[CH:12]=[CH:13][CH:14]=[CH:15][C:9]=2[O:8]1)[C:3]([F:6])([F:5])[F:4].[N+:20]([O-])([OH:22])=[O:21].S(=O)(=O)(O)O>C(Cl)Cl>[N+:20]([C:13]1[CH:14]=[CH:15][C:9]2[O:8][C:7]([CH:2]([Cl:1])[C:3]([F:6])([F:5])[F:4])([C:16]([F:19])([F:18])[F:17])[O:11][C:10]=2[CH:12]=1)([O-:22])=[O:21]613 g of 2-(1-chloro-2,2,2-trifluoroethyl)-2-trifluoromethyl-1,3-benzodioxole of Example 2a were dissolved in 1.2 l of methylene chloride and the solution was added dropwise at 0° to 10° C. to a mixture of 400 ml of 65% strength nitric acid and 400 ml of concentrated sulphuric acid. Stiring was continued for 2 hours at room temperature. Then, the mixture was poured carefully into 2 l of ice-water and extracted using methylene chloride. The combined organic phases were washed twice using water, dried and concentrated. The yield was 652 g (93% of theory). The NMR spectra showed the following characteristic absorptions: 19F-NMR: -66.4 and -79.2 ppm. 1H-NMR: 4.81 ppm.
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