Fun Hoong-Kun, Yeap Chin Sing, Sujith K V, Kalluraya B
Acta Crystallogr Sect E Struct Rep Online. 2009 May 7;65(Pt 6):o1196-7. doi: 10.1107/S1600536809015906.
The asymmetric unit of title compound, C(20)H(23)ClN(2)O, consists of two crystallographically independent mol-ecules (A and B) in which the orientations of the 4-isobutyl-phenyl units are different. The isobutyl group of mol-ecule B is disordered over two positions with occupancies of 0.850 (5) and 0.150 (5). The dihedral angle between the two benzene rings is 88.70 (9)° in mol-ecule A and 89.38 (9)° in mol-ecule B. The independent mol-ecules are linked together into chains along [100] by N-H⋯O and C-H⋯O hydrogen bonds, and by C-H⋯π inter-actions. In the chain, N-H⋯O and C-H⋯O hydrogen bonds generate R(2) (1)(6) ring motifs. In addition, C-H⋯N hydrogen bonds are observed. The presence of pseudosymmetry in the structure suggests the higher symmetry space group Pbca but attempts to refine the structure in this space group resulted in high R (0.119) and wR (0.296) values.
