Crystal and Molecular Structure Studies of Ethyl 4-(4-Hydroxyphenyl)-6-(6-methoxy-2-naphthyl)-2-oxocyclohex-3-ene-1-carboxylate and Ethyl 4-(3-Bromophenyl)-6-(6-methoxy-2-naphthyl)-2-oxocyclohex-3-ene-1-carboxylate

The crystal and molecular structures of the title compounds, ethyl 4-(4-hydroxyphenyl)-6-(6-methoxy-2-naphthyl)-2-oxocyclohex-3-ene-1-carboxylate ( I) and ethyl 4-(3-bromophenyl)-6-(6-methoxy-2-naphthyl)-2-oxocyclohex-3-ene-1-carboxylate ( II), are reported and confirmed by single crystal X-ray diffraction data. Compound ( I), C 26H 24O 5, crystallizes from a methanol solution in the monoclinic C2/ c space group with eight molecules in the unit cell. The unit cell parameters are: a = 25.4114(5) ？, b = 8.47440(10) ？, c = 20.6921(4) ？, β = 108.328(2)° and V = 4229.92(13) ？ 3. Disorder is observed throughout the entire molecule with an occupancy ratio 0.690(2):0.310(2). Compound ( II), C 26H 23O 4Br, crystallizes from an ethyl acetate solution in the monoclinic P2 1/ c spacegroup with four molecules in the unit cell. The unit cell parameters are a = 17.8991(9) ？, b = 11.4369(6) ？, c = 10.8507(5) ？, β = 92.428(4)° and V = 2219.25(19) ？ 3. Disorder is observed in the cyclohexenone ring and the carboxylate group with an occupancy ratio 0.830(6):0.170(6). Weak O–H...O ( I) or C–H...O ( II) intermolecular interactions are observed which influence crystal packing stability. These chalcone derivative types of molecules are important in their ability to act as activated unsaturated systems in conjugated addition reactions of carbanions in the presence of basic catalysts which exhibit a multitude of biological activities.