Arenetellurinic mixed anhydrides

Arenetellurinic mixed anhydrides (general procedure) A solution of diaryl diteUuride (0.5 mmol) in methylene chloride (5 mL) was added to a stirred solution of phenyho-dine(III) dicarboxylate (1.5 mmol) in the same solvent (15 mL) at room temperature. The colour of diaryl diteUuride faded quickly. After stirring about 15 min the solvent was removed in vacuo and petroleum ether (15 mL) was added to the residue. The sohd was collected and recystallized from methylene chloride-petroleum ether or benzene-petroleum ether to give pure anenetellurinic mixed anhydride. 

Disulfides, diselenides, and ditellurides can be oxidized by hypervalent iodine compounds quite easily. Depending on the reaction conditions disulfides can be oxidized to sulfinic esters [59] or thiosulfonic S-esters [60,61]. Diselenides can be transformed into selenosulfonates [62]. Arenetellurinic mixed anhydrides are mild oxidants and can be obtained by oxidation of the corresponding ditellurides as shown in Scheme 9 [63]. Recently it was shown that a thioacetal based linker for solid-phase synthesis can be cleaved oxidatively using [bis(trifluoro-acetoxy)iodo]benzene 4 [64]. 

Arenetellurinic anhydrides are formed from the mixed anhydrides by hydrolysis, but a more convenient one-pot procedure for their preparation involves the reaction of phenyliodine(III) dicarboxylate with diaryl ditellurides in the two-phase system CH2CI2/H2O 10%. ... 

Only a few examples of arenetellurinyl carboxylates, the mixed anhydrides of tellurinic acids and carboxylic acids, are known. These eompounds were prepared by refluxing mixtures of arenetellurinic acid anhydrides with acetic or trifluoroacetic acid or their anhydrides in chloroform . Acetonitrile and 1,2-dichloroethane were also used as solvents. Benzenetellurinyl trifluoroacetate is described as a very hygroscopic, intractable oil. The arenetellurinyl acetates are solids with melting points of approximately 150°. 

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