“…Ketene dithioacetal S , S -dioxides, as an example, are easily prepared; β-alkylation of such derivatives may lead to highly substituted α-thiosulfones. These, in turn, are convenient synthetic intermediates in view of several possible elaborations, e.g., C -alkylation and -arylation, substitution of an allyl for a sulfone group, desulfurization, , pyrolysis to yield a carbonyl derivative, Pummerer rearrangement . Ketene dithioacetal S , S -dioxides have been shown to act as efficient acceptors of carbenes as well as of 1-hydroxy- (or alkoxy-)alkyl radicals. , Furthermore, intramolecular radical addition of β-(ω-iodoalkyl) derivatives has been shown to occur under classic radical chain conditions yielding five-, six-, and also four-membered cyclic derivatives, a result rationalized on the basis of the peculiar stability of the adduct radical due to the captodative effect .…”