The sulphonium salt (VII) when exposed to base is cleanly rearranged to the sulphide (IX) even at –40°, indicating that extensive delocalisation of the intermediate ylide is insufficient to prevent the sigmatropic rearrangement.
J. E. Baldwin and W. F. Erickson, J. Chem. Soc. D, 1971, 359 DOI: 10.1039/C29710000359
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