Thiirane dioxides photolysis

Thiirenes have been isolated in argon matrices at 8 K by photolysis of 1,2,3-thiadiazoles or vinyl trithiocarbonates (Scheme 85) <80PAC1623, 81JA486). They are highly reactive and decompose to thioketenes and alkynes. Electron-withdrawing substituents stabilize thiiranes somewhat, but no thiirenes stable at room temperature are known, unlike the relatively stable thiirene 1-oxides and thiirene 1,1-dioxides. 

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