3-(2-Hydroxy-phenyl)-5-phenyl-6-ethoxycarbonyl-cyclohex-2-enone was synthesized. Its composition and structure were characterized by elemental analysis, IR, UV, ¹H NMR and MS spectra, and the crystal structure was determined by X-ray single crystal diffraction method. The crystal of the compound belongs to monoclinic system with space group P2₁/c, a=1.41946(17) nm, b=0.58445(7) nm, c=2.1756(3)nm, β=104.795(2)°, V=1.7450(4) nm³, Z=4, D_c=1.280 g·cm^-3, F(000)=712, μ=0.088 mm^-1, R₁ [I＞2σ(I)]=0.0627, wR₂ [I＞2σ(I)]=0.1484. The crystal measurement showed that the cyclohexene unit of the title compound has a quasi-chair conformation, and a dimer with 16-membered cycle was produced by the intermolecular hydrogen bonding.

Key words: 3-(2-hydroxy-phenyl)-5-phenyl-6-ethoxycarbonyl-cyclohex-2-enone, synthesis, crystal structure, hydrogen bond