The ring-opening reaction of 3-thienyllithium derivatives constitutes a regio-and stereospecific synthesis of acetylenic vinyl sulfides (Scheme I). This kind of substance has attracted increased attention due to the possibilities presented to replace an alkyl-or arylthio group with carbon-carbon bonds.'V2 Furthermore, the facile oxidation of sulfur to the corresponding sulfoxides and sulfones with m-chloroperbenzoic acid3 presents an ...
