4-Acyl-4H,6H-thieno[3,4-c]furan 5,5-dioxides have been prepared and submitted to Diels–Alder reactions to afford dienes with greater steric congestion after desulfonylation.
K. Ando, C. Hatano, N. Akadegawa, A. Shigihara and H. Takayama, J. Chem. Soc., Chem. Commun., 1992, 870 DOI: 10.1039/C39920000870
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