M. Aono et al., NEW METHOD FOR GENERATION OF THIOCARBONYL YLIDES FROM BIS(TRIMETHYLSILYLMETHYL) SULFOXIDES AND THEIR APPLICATION TO CYCLOADDITIONS, Heterocycles, 40(1), 1995, pp. 249-260
Thiocarbonyl ylides were generated by heating of bis(trimethylsilylmet
hyl) sulfoxides. Cycloadditions of the ylides in the presence of dipol
arophiles proceeded smoothly to give di- or tetrahydrothiophenes.