Generation of a thioladehyde S-oxide (sulphine) by retro-Diels–Alder reactions
Abstract
Cycloadducts of the thioaldehyde S-oxide (sulphine), ethyl thioxoacetate oxide, with anthracene, cyclopentadiene, and the alkaloid thebaine (7), dissociate when heated (60–111 °C), releasing the sulphine, which is trapped in situ by cycloaddition to various conjugated dienes.
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