The existence of hexacoordinate hypervalent carbon compounds is discovered theoretically. Kohn-Sham orbitals related to three-center four-electron bonds are obtained for a compound, in which two 2,6-bis(p-methylphenyloxymethyl) phenyl groups are bonded to a carbon atom. Estimated bond energies confirm the existence of the hypervalent bond between carbon and oxygen atoms. (C) 2008 Elsevier B. V. All rights reserved.