Abstract
AbstractThe title reactions yield labile 4,5‐dihydro‐1,3‐oxazole‐4‐spiro‐2′‐thiiranes 4 which isomerize in solution to the thietan‐3‐imines 5. This isomerization also occurs when the spiro compounds are heated to their melting points, but here the desulfurized products 8 and 9 are also formed in some cases. These are also the products obtained by SO2 extrusion of the sulfones 10 derived from 5.
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