Experimental

disorder in main residue; R factor = 0.073; wR factor = 0.216; data-to-parameter ratio = 14.8. The P atom in the title molecule, C24H28N3O2P, is in a distorted tetrahedral P ( O)(N)(N)2 environment. The phosphoryl group and the NH unit adopt a syn orientation with respect to each other and the N atoms have sp2 character. The P—N bonds in the P(O)[N(CH3)(CH2C6H5)]2 unit are shorter than the P—N bond in the C ( O)NHP ( O) fragment. An intramolecular C—H O hydrogen bond occurs. In the crystal, pairs of P O H—N hydrogen bonds form centro-symmetric dimers. C—H O contacts are also observed. Four C atoms of two benzene rings are disordered over two alternative sites with an occupancy ratio of 0.523 (12):0.427 (12). Related literature For hydrogen-bond patterns in compounds with formula RC(O)NHP(O)[NR1R2]2 and RC(O)NHP(O)[NHR 1]2, see: Toghraee et al. (2011). For hydrogen-bond strengths and for bond lengths and angles in a related structure, see: Pourayoubi et al. (2011)