Synthesis and crystal structure of 4-(4-N N,-dimethyl)phenyl-7,7-dimethyl-5-oxo-3,4,5,6,7,8-hexahydrocoumorinone

The title compound (C19H23NO3) has been synthesized by the reaction of 4-N,N-dimethyl benzaldehyde, 5,5-dimethyl-1,3-cycloliexadione and meldrums in ethendiole for at 80 degreesC 2.5 hrs. Its structure was determined by single-crystal X-ray diffraction. The crystal is monoclinic, space group P2(1) with a=9.364(2), b=5.974(1), c=15.731(3)Angstrom, beta =102.87(3)degrees, V=857.9(3) Angstrom (3), Z=2, D-c=1.213Mg/m(3), p(MoK alpha)=0.082mm(-1), F(000)=336. The structure was solved by direct methods, and refined by full-matrix least-squares method to the final R=0.0521, wR=0.1392. X-ray analysis reveals that the dihedral angle between plane 1 (C(10)similar toC(15)) and plane 2 (C(5)-C6)-C(8)-C(9)-O(2)) is 88.77 degrees, between plane I and plane 3 (C(1)-C(2)-C(4)-C(5)-C(9)) is 86.58 degrees, between plane 2 and plane 3 is 1.86 degrees.