3,3'-Di-tert-butyl-1,1'-[1,3-phenylenebis(methylene)]diurea

Abstract

The title compound, C18H30N4O2, contains two tert-butyl urea groups, each connected to a benzene ring though a methyl-ene group. One of the groups occupies a position almost normal to the aromatic plane with a C - N - C - C torsion angle of -94.4 (4)°, while the other is considerably twisted from the ring with a C - N - C - C torsion angle of -136.1 (4)°. In the crystal, pairs of mol-ecules are connected to each other, forming centrosymmetric dimers in which two NH groups of one mol-ecule act as hydrogen-bond donors to one carbonyl O atom of the other mol-ecule. The dimers are linked into sheets parallel to (100) by N - H⋯O hydrogen bonds involving the remaining N - H and C=O groups.