Crystal Structure and Thermal Property of 4-(3-Chloropheny1)-3-isopropyl-l-methyl-3,4-dihydroquinolin-2(1H)-one

The target compound (C19H20ClNO) was structurally determined by single-crystal X-ray diffraction. The crystal is in monoclinic system, space group P2(1)/n with a = 9.2365(2), b = 12.1241(3), c = 14.9960(4) angstrom, beta = 106.589(3)degrees, C19H20ClNO, M-r = 313.81, D-c = 1.295 g/cm(3), V = 1609.42(7) angstrom(3), Z = 4, F(000) = 664, mu(MoKa) = 2.097 mm(-1), T = 200(10) K, 2813 independent reflections with 2533 observed ones (I > 2 sigma(I)), R = 0.0389 and wR = 0.1057 with GOF = 1.043 (R = 0.0423 and wR = 0.1083 for all data). The 3,4-dihydroquinolin-2(1H)-one moiety maintains thermodynamically stable trans configuration. The decomposition mechanism of compound 3 is complex by thermal analysis.