Synthesis and crystal structure of 3-methyl-10-(4-nitrophenyl)-7,8,10, 10atetrahydropyrano[ 4,3-b]chromene-1,9(4aH,6H)-dione

The title compound (C19H15NO6) was synthesized via a three-component reaction and characterized by means of IR and 1H NMR. Its crystal and molecular structures were determined by X-ray diffractometry. It belongs to the monoclinic system, space group P21/c with a = 11.670(3), b = 12.076(3), c = 11.613(3) Å, β = 99.490(4)°, V = 1614.2(7) Å3, Mr = 353.32, Z = 4, Dc = 1.454 g/cm3, = 0.71073 Å, μ = 0.110 mm-1, F(000) = 736, the final R = 0.0503 and wR = 0.1311. A total of 8454 reflections were collected, of which 3497 were independent (Rint = 0.0333) and 2102 were observed with I > 2s(I). Copyright © 2008 Chinese Journal of Structural Chemistry.