Selenoaldehydes formed by 1,2-elimination and trapped as Diels–Alder adducts

Abstract
Various selenenyl derivatives, RO2C·CH2SeX, underwent elimination with triethylamine to form selenoaldehydes, RO2C·CHSe, which were trapped in situ as cycloadducts with conjugated dienes; the adduct of ethyl selenoxoacetate and anthracene dissociated upon heating thereby allowing transfer of the selenoaldehyde to 2,3-dimethylbuta-1,3-diene.

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