Allylic Compounds of Magnesium, Lithium, and Potassium: σ‐ or π‐Structures?

Abstract

σ-Bonds in allyl-MgBr, non-symmetrical π-bonds and symmetrical π-bonds, respectively, in allyl-Li and allyl-K compounds—these are the grossly simplified NMR findings obtained in solution by the isotopic perturbation technique.