The readily available 2-trimethylsilyl-2,5-dihydrothiophene 1,1-dioxide can be converted regioselectively into the dialkyl- and dispiro analogues, which are precursors of the corresponding 1,1-disubstituted buta-1,3-dienes and asymmetric dicycloalkylidenylethanes, respectively.
H. Tso, T. Chou and W. Lee, J. Chem. Soc., Chem. Commun., 1987, 934 DOI: 10.1039/C39870000934
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