The parent 2λ4δ2-thieno[3,4-c]thiophene was generated by Pummerer dehydration of 1H,3H-thieno[3,4-c]thiophene 2-oxide and characterized by chemical trapping experiments.
J. Nakayama, A. Ishii, Y. Kobayashi and M. Hoshino, J. Chem. Soc., Chem. Commun., 1988, 959 DOI: 10.1039/C39880000959
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