• Reaction with 2-bromothiophene in the presence of a Cu catalyst and KOH in DMF gives 2,2'-dithienyl sulfide: Org. Synth. Coll., 6, 558 (1988); with 2-iodothiophene, the product is obtained in high yield in the absence of catalyst, base or solvent: Tetrahedron Lett., 36, 8439 (1995).
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The nature of the unusual reversible dimerization reaction which occurs on standing has been studied: J. Org. Chem., 54, 3224 (1989); Doklady Akad. Nauk., 305, 624 (1989):

• Review of thiophenethiols: Russ. Chem. Rev., 60, 1309 (1991).