Chloromethyl trimethylsilylmethyl sulphide acts as a parent thiocarbonyl ylide synthon and reacts stereospecifically with activated alkenes and alkynes, catalysed by caesium fluoride, in acetonitrile at room temperature to give tetrahydro- and dihydro-thiophene derivatives in good yields.
A. Hosomi, Y. Matsuyama and H. Sakurai, J. Chem. Soc., Chem. Commun., 1986, 1073 DOI: 10.1039/C39860001073
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