The first monoribbed-functionalized tris-dioximate iron(II) clathrochelate with two inherent NH2-substituents, its reactivity, acid-base and coordination-chemical properties

► The iron(II) clathrochelate with two inherent NH2-groups was obtained. ► Clathrochelate NH2-groups have an amide character and undergo deprotonation. ► The clathrochelate dianion is an acido-ligand and coordinates to copper(II) ion. ► The condensation of clathrochelate dianion with benzil gave piperazinone fragment. ► The reaction is benzilic-type rearrangement with 1,2-shift of the phenyl substituent.