Group transfer reaction
Encyclopedia
Group transfer reactions are pericyclic reactions where one pi bond is converted to one sigma bond, at the same time that a sigma bond migrates.

The best known group transfer reaction is the ene reaction
Ene reaction
The Ene reaction is a chemical reaction between an alkene with an allylic hydrogen and a compound containing a multiple bond , in order to form a new σ-bond with migration of the ene double bond and 1,5 hydrogen shift. The product is a substituted alkene with the double bond shifted to the...

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