Sulfur-containing carboxylic acids. 6. The syntheses of 3,3"-sulfinyldipropionic and 2,2"-sulfinyldiacetic acids

Pure sulfoxides of thiodialiphatic acids were obtained in high yields by oxidation of the corresponding sulfides in organic solvents. 3,3"-Sulfinyldipropionic acid was obtained by the reaction of hydrogen peroxide with thiodipropionic acid in acetone. 2,2"-Sulfinyldiacetic acid was synthesized by the reaction of thiodiglycolic acid with H₂O₂ in acetone containing acetic acid (26 mol. %). Pure 2,2"-sulfinyldiacetic acid was found to be stable in storage rather than labile as reported previously.