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ChemInform Abstract On treatment with a base, the tetroxide (I) generates 1,2-and/or 1,4-dipolar fragments, which are trapped by the alkenes (II) or by the alkynes (V) to afford products of (2 + 2) cycloaddition, the 1,2-thiazetidine 1,1-dioxides (III) and/or products of (2 + 4) cycloaddition, the 1,4,5-oxathiazine 4,4-dioxides (IV) or (VI). The mechanisms of these cycloadditions are discussed in detail. The derivatives (IIIa) and (IVa) are additionally characterized by X-ray analyses. Compound (IIIa) has the space group P1 with Z=2 and compound (IVa) has the space group P21/b with Z=4. Features of the structures of these compounds are described in detail.

The title compounds (III) are obtained by reacting the tetroxide (I) with the tertiary amines (II).