Synthesis and Crystal Structure of 4-(2-Bromophenyl)-3,4,7,8-tetrahydro-7,7-dimethyl-1-p-tolylquinoline-2,5(1H,6H)-dione

The title compound 4-(2-bromophenyl)-3,4,7,8-tetrahydro-7,7-dimethyl-1-p-tolylquinoline-2,5(1H,6H)-dione 1 (C24H24BrNO2, M-r = 438.35) was synthesized and characterized by IR, H-1 NMR and elemental analysis. The crystal belongs to monoclinic, space group C2/c with a = 27.565(14), b = 10.079(5), c = 15.917(8) angstrom, beta = 111.059(9)degrees, Z = 8, V = 4127(4) angstrom(3), D-c = 1.411 g.cm(-3), mu(MoK alpha) = 2.011 mm(-1), F(000) = 1808, the final R = 0.0417 and wR = 0.1032 for 2393 observed reflections (I > 2 sigma(I)). X-ray analysis reveals that the pyridine ring adopts a distorted boat conformation, while another six-membered ring takes a half-chair conformation. In addition, there are non-classical hydrogen bonds of C-H center dot center dot center dot O and C-H center dot center dot center dot Br in the structure. The short distance (3.481 angstrom) between the adjacent 2-bromophenyl rings indicates the existence of pi-pi interaction.