(S)-3-Acetyl-3-[(R)-1-(4-bromo­phen­yl)-2-nitro­eth­yl]oxolan-2-one

The title compound, C₁₄H₁₄BrNO₅, has two chiral C atoms. The quaternary C atom in the oxolanone ring has an S configuration, while the adjacent tertiary C atom has an R configuration. The oxolanone ring adopts an envelope conformation, with the flap C atom lying 0.298 (3) Å from the mean plane of the remaining four atoms. In the crystal, mol­ecules are connected into chains along [010] via weak C—H...O hydrogen bonds.

1-(Isopropyl­amino)-3-phen­oxy­propan-2-ol

In the crystal structure of the title amino alcohol derivitive, C₁₂H₁₉NO₂, mol­ecules are linked by N—H...O hydrogen bonds. The mol­ecular structure exhibits an intra­molecular O—H...N hydrogen bond.

Ethyl (2R,3S)-2-benzoyl-3-(4-bromo­phen­yl)-4-nitro­butano­ate

The title compoud, C₁₉H₁₈BrNO₅, was synthesized by an organocatalytic reaction. The aymmetric unit contains two independent mol­ecules, in each of which the carbon between the two carbonyl groups adopts an R configuration, while the adjacent C atom has an S configuration. The dihedral angle between the two benzene rings is different in the two mol­ecules [11.64 (3) and 58.96 (4)°].

1,2,4,5-Tetra­phenyl-1H-imidazole

The asymmetric unit of the title compound, C₂₇H₂₀N₂, contains two independent mol­ecules, A and B. In both mol­ecules, the N atom in the 1-position and the C atom in the 5-position are statistically disordered [as 0.571 (8):0.429 (8) in A and 0.736 (9):0.264 (9) in B]. The phenyl rings in the 1-, 2-, 4- and 5-positions in A are twisted from the central imidazole ring by 84.3 (2), 21.6 (2), 21.5 (2) and 75.7 (2)°, respectively. The corresponding dihedral angles in B are 85.5 (2), 3.8 (2), 2.4 (2) and 81.7 (2)°, respectively.

(E)-3-(2-Bromo­phen­yl)-1-(3,4-dimeth­oxy­phen­yl)prop-2-en-1-one

The crystal structure of the title compound, C₁₇H₁₅BrO₃, a chalcone derivative, exhibits two crystallographically independent mol­ecules per asymmetric unit showing an E conformation about the ethyl­ene double bond. In each mol­ecule, the two phenyl rings are almost coplanar: the mean planes make dihedral angles of 9.3 (2) and 19.4 (2)°. In the crystal, mol­ecules are linked through weak inter­molecular C—H...O hydrogen bonds.

catena-Poly[[(1,10-phenanthroline-κ²N,N′)lanthanum(III)]-μ-(5-bromo-2-hy­droxy­benzoato)-κ²O¹:O^1′-di-μ-chlorido]

In the title complex, [La(C₇H₄BrO₃)Cl₂(C₁₂H₈N₂)]_n, the La^III ion is eight-coordinated by two carboxyl­ate O atoms from two 5-bromo­salicylate ligands, two N atoms from a chelating 1,10-phenanthroline ligand and four bridging Cl atoms in a distorted square-anti­prismatic geometry. The La^III ions are linked by bridging carboxyl­ate groups and chloride anions into a chain along [100]. An intra­molecular O—H...O hydrogen bond is formed in the 5-bromo­salicylate ligand. π–π inter­actions between the pyridine and benzene rings and between the benzene rings are observed [centroid–centroid distances = 3.794 (5) and 3.804 (4) Å].

3-Oxapentane-1,5-diyl dicarbamate

The complete mol­ecule of the title compound, C₆H₁₂N₂O₅, is generated by a rotation about a twofold axis. The conformation along the bond sequence linking the two amino groups is trans-trans-(+)gauche-trans-trans. In the crystal, N—H...O hydrogen bonds link the mol­ecules into a three-dimensional supra­molecular architecture.

1,4-Phenyl­enebis(methyl­ene) dicarbamate

The title compound, C₁₀H₁₂N₂O₄, is a phenyl dicarbamate with crystallographically imposed inversion symmetry. The dihedral angle between the carbamo­yloxy plane [i.e. the plane of the N—C(O)—O fragment; r.m.s. deviation = 0.002 (3) Å] and the plane of the aryl ring is 29.2 (1)°. In the crystal, two different centrosymmetric N—H...O hydrogen-bond inter­actions are observed; these are described as R₂²(8) and R²₄(8) in graph-set notation. The rings form an alternating sequence, linking the mol­ecules into a sheet structure parallel to (011).

N-(4-Chloro­phen­yl)-4-meth­oxy-3-(propanamido)­benzamide cyclo­hexane hemisolvate

The title compound, C₁₇H₁₇ClN₂O₃·0.5C₆H₁₂, was prepared by the condensation reaction of 4-meth­oxy-3-(propanamido)­benzoic acid with 4-chloro­aniline. The Cl atom, the propionyl CH₃ group and the cyclo­hexyl CH₂ group are disordered over two sets of sites of equal occupancy in both mol­ecules. The cyclo­hexane solvent mol­ecule is disordered over two orientations which were modelled with relative occupancies of 0.484 (4) and 0.516 (4). In the crystal, there are a number of N—H...O hydrogen bonds, forming layers perpendicular to (001).

(1S*,5R*)-9-Phenyl-9-aza­bicyclo­[3.3.1]nonan-3-one

In the title compound, C₁₄H₁₇NO, the piperidinone and piperidine rings both adopt a chair conformation. The chiral crystals were obtained from a racemic reaction product via spontaneous resolution.