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Two for Te: The ditelluronic acid 3 is the first heavy congener of sulfonic and selenonic acids and is obtained by the O2 oxidation of the tellurinate 2 in the presence of [18]crown‐6. Compound 2 is prepared by the reaction of the ditellurinic acid 1 with NaH. The direct oxidation of 1 to 3 using strong oxidants, such as H2O2, KMnO4, and NaIO4 failed.
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