Abstract
Recently much attention has been focussed on ene reactions, and their synthetic utility has been increased because of their high regio- and stereospecificity. Ene reaction is based on addition of a compound with electron-deficient multiple bond (an enophile) to an olefin possessing an allylic hydrogen (an ene).
Intermolecular ene reactions are classified by functional groups in enophiles. The differences between thermal reactions and Lewis acid catalyzed ones are discussed.
Intramolecular ene reactions including metallo-ene systems are reviewd according to the classification (Type I- III) reported by Oppolzer.
