Reanimation: Catalytically inactive π‐allyl ironcomplexes are “reanimated” upon addition of N‐heterocyclic carbene ligands such as 1,3‐dimesitylimidazolin‐2‐ylidene (SIMES). A comparison of stoichiometric and catalytic allylic alkylation reactions shows the π‐allyl mechanism to be active in this catalytic system.