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In the realm of organic chemistry, the Alder ene reaction is a chemical process that occurs between an alkene possessing an allylic hydrogen (known as the ene) and a compound that contains a multiple bond (referred to as the enophile). The primary objective of this reaction is to create a new σ-bond through the migration of the ene double bond and a 1,5 hydrogen shift. As a result, a substituted alkene is formed, with the double bond repositioned to the allylic position.

The enophile in the Alder ene reaction can also take the form of an aldehyde, ketone, or imine. In such scenarios, the reaction yields β-hydroxy- or β-aminoolefins as products. However, these compounds can exhibit instability under the reaction conditions. At elevated temperatures, typically exceeding 400°C, a reverse reaction called the Retro-Ene Reaction can occur.

Although the Alder ene reaction and the Prins Reaction differ mechanistically, they can yield similar outcomes.

图1 ：反应

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