Monoclinic Crystal Class Research Articles

Crystal Structure of 7,8-Dimethylcoumarin-4-acetic Acid Ethyl Ester

The title compound, C14H14O4, was synthesized and characterized by X-ray diffraction analysis. The compound crystallizes in the monoclinic crystal class in the space group P21/c with cell parameters a = 9.6970(7)A, b = 10.3820(7)A, c = 12.9440(9)A, β = 110.130(3)° and Z = 4. The structure exhibits inter and intramolecular hydrogen bonds of the type C-H…O.

Synthesis and Crystal Structure of 6-Butyl-5,6-dihydrobenzo-[4,5]imidazo[1,2-c]quinazoline

The title compound was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic crystal class in the space group P21/n with cell parameters a = 7.6800(6)A, b = 17.3330(15)A, c = 12.0440(8)A, β = 105.248(5)°, Z = 4. The quinazoline ring is in envelope conformation. The structure exhibits an intermolecular hydrogen bond of the type N-H…N.

Crystal Structure of a Bioactive 4-Bromomethyl-biphenyl-2-carboxylic Acid tert-Butyl Ester

The title compound was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic crystal class in the space group P21/c with cell parameters a = 9.2360(9)A, b = 14.1980(10)A, c = 13.1330(14)A, β = 105.843(3)°, Z = 4. The carbonyl group can be oriented in the +synclinal conformation.

Synthesis and Crystal Structure of 2-[(4-Methylbenzoyloxy)-5-methylphenyl]-phenyl methanone

The title compound was synthesized and the structure was investigated by X-ray methods. The compound crystallizes in monoclinic crystal class in the space group P21/n with cell parameters a = 8.6040(5)A, b = 16.0630(19)A, c = 12.9530(15)A, β = 96.455(7)° and Z = 4. The structure exhibits an intermolecular hydrogen bond of the type C-H…O. The carbonyl group bond lengths of ketone and ester are slightly different.

Crystal Structure of 2-Ethoxy-N-[4-(pyrimidin-2-ylsulfamoyl)-phenyl]-benzamide

The title compound was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic crystal class in the space group C2/c with cell parameters a = 29.8520(1)Å, b = 9.5220(7)Å, c = 14.9130(1)Å, β = 112.252(4)°, Z = 8. The geometries around the S atom are distorted from a regular tetrahedron.

Synthesis and Crystal Structure of (4-Hydroxy-3-methylphenyl)(4-methylphenyl)methanone

The title compound, C15H14O2, was synthesized and the structure was studied by X-ray crystallography. The compound crystallizes in monoclinic crystal class in the space group P21/n with cell parameters a = 5.9910(5)A, b = 13.493(2)A, c = 14.894(2)A, β = 95.776(8)° and Z = 4. The structure exhibits intermolecular hydrogen bonds of the type O-H…O.

Synthesis and Crystal Structure of 1,3-Dibenzoyloxy Benzene

The title compound was synthesized and the structure was investigated by X-ray methods. The compound crystallizes in monoclinic crystal class in the space group P21/c with cell parameters a = 5.893(6)A, b = 31.781(3)A, c = 8.341(8)A, β = 94.256(5)°, Z = 4. The structure exhibits intermolecular hydrogen bonds of the type C-H…O.

Crystal and Molecular Structure of 3,5-Dicarbethoxy-2,6-dimethyl-4-(4'-methoxy)phenyl-1,4-dihydropyridine

1,4-Dihydropyridines (DHP) are known for their action as calcium channel blockers and are used for treatment of various cardiovascular diseases. The title compound was synthesized following the classical Hantzsch synthesis. The compound crystallizes in monoclinic crystal class in the space group P21/n with cell parameters a = 9.744(3)A, b = 7.460(2)A c = 26.662(5)A, β = 98.34(2)°, Z = 4. The structure adopts a flat boat conformation.

ChemInform Abstract: CUBITENE‐ AN IRREGULAR TWELVE‐MEMBERED‐RING DITERPENE FROM A TERMITE SOLDIER

Cubitene was isolated from the hexane extract of C. umbratus soldier heads by chromatography over Florisil followed by preparative GLC. High resolution mass spectroscopy indicated the formula of cubitene to be C/sub 20/H/sub 32/. Mass spectra of catalytically hydrogenated cubitene products showed peaks at m/rho 279, consistent with their formulation as substituted cycloalkanes of the composition C/sub 20/H/sub 40/. Cubitene is therefore a monocyclic hydrocarbon with four centers of unsaturation. the /sup 1/H NMR spectral data revealed the presence of two 1,1-disubstituted double bonds, and two additional olefinic protons. Four methyl groups attached to double bonds are also observed. The /sup 13/C NMR spectrum indicated the presence of two tribsubstituted double bonds. Fortunately, cubitene could be obtained in crystalline form (mp 34.5-35/sup 0/C) from cold methanol, allowing a single-crystal x-ray diffraction analysis. It crystallized in the monoclinic crystal class. Lattice parameters were: a = 15.963 (5), b = 6.799 (2), c = 17.038 (5) A; theta = 96.99 (2)/sup 0/. Evidence shows cubitene to be 1,5-dimethyl-8,10-bis(isopropenyl)cyclododeca-1,5-diene, a structure in which one isoprene unit is irregularly joined to three others. It appears to be the first example of a diterpene hydrocarbon based on a twelve-membered carbocyclic ring. Its biosynthesis poses interestingmore » problems. Two possible biosynthetic routes are suggested. An even more basic question remains....whether termite soldiers synthesize cubitene at all, or whether they simply sequester it (or a closely related precursor) from their food.« less

Cubitene: an irregular twelve-membered-ring diterpene from a termite soldier

Cubitene was isolated from the hexane extract of C. umbratus soldier heads by chromatography over Florisil followed by preparative GLC. High resolution mass spectroscopy indicated the formula of cubitene to be C/sub 20/H/sub 32/. Mass spectra of catalytically hydrogenated cubitene products showed peaks at m/rho 279, consistent with their formulation as substituted cycloalkanes of the composition C/sub 20/H/sub 40/. Cubitene is therefore a monocyclic hydrocarbon with four centers of unsaturation. the /sup 1/H NMR spectral data revealed the presence of two 1,1-disubstituted double bonds, and two additional olefinic protons. Four methyl groups attached to double bonds are also observed. The /sup 13/C NMR spectrum indicated the presence of two tribsubstituted double bonds. Fortunately, cubitene could be obtained in crystalline form (mp 34.5-35/sup 0/C) from cold methanol, allowing a single-crystal x-ray diffraction analysis. It crystallized in the monoclinic crystal class. Lattice parameters were: a = 15.963 (5), b = 6.799 (2), c = 17.038 (5) A; theta = 96.99 (2)/sup 0/. Evidence shows cubitene to be 1,5-dimethyl-8,10-bis(isopropenyl)cyclododeca-1,5-diene, a structure in which one isoprene unit is irregularly joined to three others. It appears to be the first example of a diterpene hydrocarbon based on a twelve-membered carbocyclic ring. Its biosynthesis poses interestingmore » problems. Two possible biosynthetic routes are suggested. An even more basic question remains....whether termite soldiers synthesize cubitene at all, or whether they simply sequester it (or a closely related precursor) from their food.« less

Investigations on cesium uranates—VI: The crystal structures of Cs 2U 2O 7

The crystal structures of Cs 2U 2O 7 are described. The structure of the α-compound has been refined from X-ray and neutron powder diffraction data. The structure of β-Cs 2U 2O 7 has been solved by means of X-ray powder diffraction. Besides the α and β-cesium diuranate, botyh belonging to the monoclinic crystal class, a metastable hexagonal γ-diuranate exists.