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- The Alder Ene rearrangement is a Pericyclic reaction that shares traits
with Cycloadditions, Electrocyclic Reactions, and Sigmatropic
Rearrangements.
- The Ene reaction is like a Cycloaddition because it is a 4 + 2
intramolecular supra-supra net addition to the Enophile.
- The Ene reaction is like an Electrocyclic Reaction because you have a
net loss of a Pi bond and gain of a Sigma bond.
- The Ene reaction is like a Sigmatropic Reaction because with an extra
sigma bond between the Ene and the Enophile, it looks exactly like a [1,5]
Sigmatropic shift of a hydrogen.
- The Ene and Retro-Ene reactions are involved is the formation of vinyl
acetate from acetylene and acetic acid, and decarboxylation of beta-ketocarboxylic
acids.
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Ene Reactions