Abstract: The reaction of 0-keto sulfoxides with acetic anhydride in the presence ofsodium acetate gives in one step and high yields a-acetoxy acid thioesters which are transformed into various types of a-hydroxy acid derivatives. For example, W-@-tolylsulfiny1) acetophenone produces Sb-tolyl) 2-acetoxy-2-phenylthioacetate which is converted into mandelic acid on al-kaline hydrolysis, 2-acetoxy-2-phenylacetanilide on reaction with ...