Thiolsulfinates react with trifluoro- or trichloroacetic anhydride to give equimolar mixtures of the corresponding disulfides and sulfinyl trifluoro- or trichloroacetates which are in equilibria with sulfenyl carboxylates. Although the equilibrium lies far toward sulfinyl carboxylates at room temperature, addition of olefins to the mixed solution of sulfinyl carboxylate and a corresponding disulfide
The reaction of thiolsulfinates () with rifluoro- or richloroacetic anhydride gives sulfinyl carboxylates () via formation of sulfenyl trihaloacetate (), which in the presence o olefins, can be trapped to afford β-trifluoro- or β-richloroacetoxysulfides () in good yields.