Shaw-Tao Lin, Hsien-Ju Tien and Jinn-Tsair Chen
Treatment of 3-aryl-4-(1-hydroxyethyl)sydnones with DMSO-Ac2O yielded esters and ketones, depending on the amount of Ac2O used; application of a limited amount of Ac2O with DMSO as an oxidant has been found to be the only method to convert the title compounds to the ketones.