The reaction of the trimethylsilyl enol ether of 1-thiochroman-4-one 1,1-dioxide with thionyl chloride gives the corresponding α-oxo-sulphine, which has been found to give a new type of [4 + 2] cycladduct when trapped with simple electron-rich alkenes such as isobutylene and norbornene.
I. W. J. Still and F. J. Ablenas, J. Chem. Soc., Chem. Commun., 1985, 524 DOI: 10.1039/C39850000524
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