The synthesis and some reactions of thiophene sulfides

The reaction of some electrophilic reagents (bromine, acetyl chloride, and acetic anhydride) and of butyllithium on the zinc chelate of 2-mercapto-3-thenylidenecyclohexylamine (IIIa) is examined. Bromination and acetylation of IIIa lead to fission of the chelate ring and the formation of a complex of thienoisothiazolium bromide with ZnBr₂ (VIII), and the corresponding dimienodithiocine (X). Butyllithium combines with the C=N double bond of the chelate ring (IIIa), with the formation of the chelate XIII.For part XVI, see 16].