(1E,4E)-1-(2-Nitro-phen-yl)-5-(2,6,6-trimethyl-cyclo-hex-1-en-1-yl)penta-1,4-dien-3-one

Abstract

In the title curcumin-ionone derivative, C(20)H(23)NO(3), the dihedral angle between the cyclo-hexene and benzene rings is 21.03 (8)°, with both double bonds in the inter-linking olefinic chain adopting E conformations. Two of the methyl-ene groups of the β-ionone ring are disordered over two sets of sites with occupancy ratios of 0.50:0.50 and 0.60:0.40. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds into zigzag chains extending along the b axis.

Fig. 1.

The molecular structure of the title compound, showing 30% displacement ellipsoids for the non-hydrogen atoms. The disordered components of C15 and C16 are not shown. Hydrogen atoms are drawn as spheres of arbitrary radius.