159. Metallo-ene Reactions
     Oppolzer, W.
     in Comprehensive Organic Synthesis; Trost, B. M. (Ed.)Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, Volume 5; Elsevier, 1991; Chapter 1.2; p. 29-61

The ene reaction, discovered 45 years ago by Alder,¹ usually involves the thermal reaction of an alkene containing an allylic hydrogen (ene) with an electron-deficient unsaturated compound (enophile) to form 1:1 adducts via a cyclic six-electron transition state (e.g. A + B → C^‡ → D; X = H; Scheme 1).

DOI : 10.1016/B978-0-08-052349-1.00119-0 

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