Reactivity of iron complexes containing monodentate aminophosphine ligands - Formation of four-membered carboxamido-phospha-metallacycles

The synthesis of several iron(II) complexes featuring a four-membered carboxamido-phospha-ferracycle moiety as a result of an intramolecular nucleophilic attack of a deprotonated aminophosphine ligand on coordinated CO is described.