with FeCl3 can be proposed as a general method for the synthesis of OTs when the starting materials are 4-(alkylsulfanyl)-, 4-(w-functionalized alkylsulfanyl)-, and 4-alkylsulfanyl-4′-halo-2,2′-bithiophenes. oligothiophenes - oxidative coupling - alkylsulfanyl octithiophenes - oligomerization - MS and NMR spectroscopy