Sulfoxides are formed by partial oxidation of sulfides, which upon further oxidation are converted to sulfones, and hence may be considered as a very stable intermediate in the oxidation process. However, since the sulfur-oxygen linkage in sulfoxides is polarized and much weaker than that in sulfones, sulfoxides are relatively reactive and undergo many synthetically important reactions. Therefore, the chemistry involving this trivalent sulfur species has been growing rapidly in recent years.1