Catalytic Oxidation of Sulfides to Sulfoxides by Poly(4-vinyl pyridinium nitrate), Silica Sulfuric Acid and Ammonium Bromide as a Catalyst

A new catalytic procedure for the chemoselective oxidation of sulfides to sulfoxides was studied. A variety of aliphatic and aromatic sulfides were subjected to sulfoxidation by combining poly(4-vinyl pyridinium nitrate), silica sulfuric acid (SiO2-OSO3H), and catalytic amounts of ammonium bromide in CH2Cl2 in the presence of a few drops of water at room temperature. Excellent yields were obtained.

Graphical abstractVarious sulfides were oxidized chemoselectively to their corresponding sulfoxides by poly(4-vinylpyridinium nitrate), silica sulfuric acid, and a catalytic amount of ammonium bromide at room temperature under mild and heterogeneous conditions.Figure optionsDownload full-size imageDownload as PowerPoint slide