Base-catalysed exchange of 2-H and 4-H in 3-thiatricyclo [2.2.1.02,6]heptane 3,3-dioxide (9) proceeds faster than the exchange of analogous hydrogens in cyclopropyl isopropyl sulphone (4), despite enforced pyramidalisation of the carbanion intermediates derived from (9).
W. Kirmse and U. Mrotzeck, J. Chem. Soc., Chem. Commun., 1987, 709 DOI: 10.1039/C39870000709
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