[C:1]([C:4]1[CH:5]=[CH:6][C:7]2[S:8][C:9]3[C:14]([S:15](=[O:19])(=[O:18])[C:16]=2[CH:17]=1)=[CH:13][CH:12]=[CH:11][CH:10]=3)([OH:3])=[O:2].[OH:20]O>C(O)(=O)C>[C:1]([C:4]1[CH:5]=[CH:6][C:7]2[S:8](=[O:20])[C:9]3[C:14]([S:15](=[O:19])(=[O:18])[C:16]=2[CH:17]=1)=[CH:13][CH:12]=[CH:11][CH:10]=3)([OH:3])=[O:2]3-Carboxythianthrene-5,5-dioxide ((60 mg), acetic acid acid (2.0 ml) and 30% hydrogen peroxide (0.10 ml) were boiled under reflux for 10 mins., filtered and allowed to stand overnight at 0° C. 3-Carboxythianthrene-5,5,10-trioxide crystallised out, was filtered off and dried at 156° C. at 2mm. Hg, m.p. 340°-343° C.
Wird geladen…