The crystal structure of the title compound (C19H13BrOs) has been detemlined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c, with a = 10.508(4), b = 11.354(4), c = 14.522(5...The crystal structure of the title compound (C19H13BrOs) has been detemlined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c, with a = 10.508(4), b = 11.354(4), c = 14.522(5)A, β = 106.255(4)°, V = 1663.4(10)A3, Mr = 401.20, Z = 4, Do = 1.602 g/cm^3, λ = 0.71073A, F(000) = 808,μ= 2.498 mm^-1, R = 0.0337 and wR = 0.0837 for 2200 observed reflections (1 〉 2σ(Ⅰ)). X-ray analysis reveals that the dihedral angles between planes 1 and 2, 1 and 3, 1 and 4, 2 and 3, 2 and 4, and 3 and 4 are 78.6, 82.5, 87.4, 5.6, 9.5 and 4.9°, respectively. There exists a conjugated system in the molecular structure.展开更多
The crystal structure of the title compound (C20H20O4, Mr = 324.36) has been determined by single-crystal X-ray diffraction. The crystal is of orthorhombic, space group Pbcn with a = 15.823(2), b = 18.002(3), c = 11...The crystal structure of the title compound (C20H20O4, Mr = 324.36) has been determined by single-crystal X-ray diffraction. The crystal is of orthorhombic, space group Pbcn with a = 15.823(2), b = 18.002(3), c = 11.674(2) ?, V = 3325.34(67) ?3, Dc = 1.296 g/cm3, μ = 0.090 mm-1, Z = 8, F(000) = 1376, the final R = 0.0421 and wR = 0.0996. In the molecular structure, the pyran ring is of boat conformation, and the two six-membered rings fused with it adopt twisting-boat conformations.展开更多
基金the Science and Technology Foundation of Guangdong Province (No. 031792, 06028565)
文摘The crystal structure of the title compound (C19H13BrOs) has been detemlined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c, with a = 10.508(4), b = 11.354(4), c = 14.522(5)A, β = 106.255(4)°, V = 1663.4(10)A3, Mr = 401.20, Z = 4, Do = 1.602 g/cm^3, λ = 0.71073A, F(000) = 808,μ= 2.498 mm^-1, R = 0.0337 and wR = 0.0837 for 2200 observed reflections (1 〉 2σ(Ⅰ)). X-ray analysis reveals that the dihedral angles between planes 1 and 2, 1 and 3, 1 and 4, 2 and 3, 2 and 4, and 3 and 4 are 78.6, 82.5, 87.4, 5.6, 9.5 and 4.9°, respectively. There exists a conjugated system in the molecular structure.
文摘The crystal structure of the title compound (C20H20O4, Mr = 324.36) has been determined by single-crystal X-ray diffraction. The crystal is of orthorhombic, space group Pbcn with a = 15.823(2), b = 18.002(3), c = 11.674(2) ?, V = 3325.34(67) ?3, Dc = 1.296 g/cm3, μ = 0.090 mm-1, Z = 8, F(000) = 1376, the final R = 0.0421 and wR = 0.0996. In the molecular structure, the pyran ring is of boat conformation, and the two six-membered rings fused with it adopt twisting-boat conformations.