Abstract
The conversion of thiocarbonyl compounds into their corresponding oxo derivatives involves intermediary species of the general type R1R2CSOx in several cases. These structures may be generated either by direct oxidation of the thiocarbonyl compounds (R1R2CS + x ‘O’ → R1R2CSOx) or by stepwise oxidation (R1R2CSOx-y + y ‘O’ → R1R2SOx). Within the single series (R1R2CSO, R1R2CS02, and R1R2CSO3) a variety of isomeric species may be obtained by thermally or photolytically induced intramolecular conversions. In some cases direct experimental evidence (e.g. oxathiiranes) or even isolation (e.g. sulfines, thiourea S-oxides) of R1R2CS0x compounds has been reported, but in several cases, based on experiments as well as on theoretical studies, only indirect evidence for their presence has been presented (e.g. sulfenes, oxathiirane oxides, dioxathietanes, trioxathiolanes). Investigations concerning the formation, thermal and photolytical decomposition, and physico-chemical properties of compounds with R1R2SOx (x = 1, 2, 3, (4)) structures are reviewed, whereas chemical reactions involving these species are mentioned only briefly.

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