Searching for new stable gas-phase dianions, the long-lived dianions O(BN)(4)(2-) and O(C-2)(4)(2-) dianions have been discovered computationally, which are the first dianions that contain tetrahedrally Coordinated oxygen atoms. In contrast to known hypermetalated systems such as OLi4 or OAl4, where die ligand system forms a bound cluster itself, these dianions have repelling ligands and show characteristics of covalently bond molecules.