Click the structures and reaction arrows in sequence to view the 3D models and animations respectively
The first step is a cycloaddition similar to the carbonyl ene reaction. The allylic seleninic acid produced in the first step undergoes a [2,3]-sigmatropic rearrangement to reinstate the double bond position. Rapid decomposition of the selenium (II) intermediate leads to an allylic alcohol. Oxidation can continue to give the α,β-unsaturated carbonyl product (not animated).
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