The reaction of thiolsulfinates with trifluoroacetic anhydride: A convenient preparation of β-trifluoro- and β-trichloroacetoxysulfides.

The reaction of thiolsulfinates ($\text{1}$) with rifluoro- or richloroacetic anhydride gives sulfinyl carboxylates ($\text{2}$) via formation of sulfenyl trihaloacetate ($\text{3}$), which in the presence o olefins, can be trapped to afford β-trifluoro- or β-richloroacetoxysulfides ($\text{5}$) in good yields.