Abstract: | The addition of reactive carbanions to tricarbonyl(η4-1,3-diene)iron(0) complexes proceeded at 23°C to give putative tricarbonyl(η3-allyl)iron(0) anion complexes. Trapping of the reactive intermediates with bromine produced nucleophilic-substituted tricarbonyl(η4-1,3-diene)iron(0) complexes. |