[Cl:1][C:2]12[C:14]([Cl:16])([Cl:15])[C:5]([Cl:17])([CH:6]3[CH:11]1[C:10](=[O:12])[CH:9]=[CH:8][C:7]3=[O:13])[C:4]([Cl:18])=[C:3]2[Cl:19].OO.C(=O)([O-])[O-:23].[Na+].[Na+]>C(O)C>[Cl:1][C:2]12[C:14]([Cl:15])([Cl:16])[C:5]([Cl:17])([CH:6]3[CH:11]1[C:10](=[O:12])[CH:9]1[O:23][CH:8]1[C:7]3=[O:13])[C:4]([Cl:18])=[C:3]2[Cl:19]38 g. of 1,2,3,4,9,9-hexachloro-1,4,4a,8a-tetrahydro-1,4-methanonaphthalene-5,8-dione, prepared according to Example 1, were added slowly to a solution of 200 ml. of ethanol containing 20 ml. of 30% hydrogen peroxide and 13 g. of sodium carbonate at such a rate that the temperature was maintained at 40°-50° C. The yellow color of the dione disappeared quickly. The solution was then cooled to 10°-13° C. and a white precipitate formed. This solid was filtered and recrystallized from ethanol, m.p. 180°-181° C.
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