5,5,7,12,12,14-Hexamethyl-1,8-bis­(4-nitro­benz­yl)-1,4,8,11-tetra­aza­cyclo­tetra­deca­ne

The asymmetric unit of the title compound, C₃₀H₄₆N₆O₄, contains one half-mol­ecule. The C(benzene)—C(CH₂)—N—C(—Me) torsion angle is −79.89 (13)° suggesting a synclinal orientation of the nitro­benzene ring with respect to the macrocycle. The conformation of the macrocycle is stabilized by intra­molecular N—H...N hydrogen bonds.

3,5-Dimethyl-2,6-di­phenyl­piperidine

In the title compound, C₁₉H₂₃N, the piperidine ring has a chair conformation. The phenyl rings are inclined to one another by 52.76 (16)°. One of the methyl substituents on the piperidine ring is axial while the other is equatorial, like the phenyl rings. In the crystal, mol­ecules are linked via C—H...π inter­actions, forming zigzag chains along [001].

(E)-3-(4-Hy­droxy-3-meth­oxy­phen­yl)-1-(4-hy­droxy­phen­yl)prop-2-en-1-one

In the title compound, C₁₆H₁₄O₄, there is an intra­molecular O—H...O hydrogen bond. The benzene rings are inclined to one another by 13.89 (9)°. The prop-2-en-1-one group is twisted slightly, the O=C—C_ar—C_ar (ar = aromatic) and C=C—C=O torsion angles being −10.4 (3) and −7.4 (3)°, respectively. In the crystal, mol­ecules are linked by O—H...O hydrogen bonds, forming chains along [100]. These chains are further linked by O—H...O hydrogen bonds, forming corrugated sheets lying parallel to (010). There are C—H...π inter­actions present within the sheets.

(2E)-1-(3,5-Di­hydroxy­phen­yl)-3-(4-meth­oxy­phen­yl)prop-2-en-1-one

In the title compound, C₁₆H₁₄O₄, the benzene rings are inclined to one another by 4.91 (7)°. The conformation about the C=O and C=C bonds is trans and cis, respectively. In the crystal, mol­ecules are linked by O—H...O hydrogen bonds, forming inversion dimers with an R₂²(14) ring motif. The dimers are linked via O—H...O and C—H...O hydrogen bonds, forming undulating two-dimensional networks lying parallel to (10-1). These networks are linked by further C—H...O hydrogen bonds, forming a three-dimensional structure.

N-[(1-Benzoyl­piperidin-4-yl)meth­yl]benzamide

In the title compound, C₂₀H₂₂N₂O₂, the piperidine ring adopts a chair conformation. The phenyl rings are inclined to one another by 80.1 (1)° and make dihedral angles of 46.1 (1) and 40.2 (1)° with the mean plane of the piperidine ring. In the crystal, pairs of N—H...O hydrogen bonds link the mol­ecules into inversion dimers. C—H...O inter­actions further link the mol­ecules, forming a three-dimensional supramolecular network.

Crystal structure of 4-[(2E)-3-(4-meth­oxy­phen­yl)prop-2-eno­yl]phenyl benzoate

In the title compound, C₂₃H₁₈O₄, the meth­oxy­benzene ring and attached C=C grouping are disordered over two sets of sites in a 0.823 (5):0.177 (5) ratio. The dihedral angles between the central benzene ring and the pendant phenyl and meth­oxy­benzene ring (major orientation) are 51.21 (1) and 51.6 (1)°, respectively. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds generate R₂²(28) loops.

Crystal structure of 2-amino-4-methyl­pyridin-1-ium (2R,3R)-3-carb­oxy-2,3-di­hydroxy­propano­ate monohydrate

The title mol­ecular salt, C₆H₉N₂⁺·C₄H₅O₆⁻·H₂O, crystallized with two 2-amino-4-methyl­pyridin-1-ium cations, two L-(+)-tartaric acid monoanions [systematic name: (2R,3R)-3-carb­oxy-2,3-di­hydroxy­propano­ate] and two water mol­ecules in the asymmetric unit. In the crystal, the cations, anions and water mol­ecules are linked via a number of O—H...O and N—H...O hydrogen bonds, and a C—H...O hydrogen bond, forming a three-dimensional structure

Crystal structure of 4-chloro-N-{[1-(4-chloro­benzo­yl)piperidin-4-yl]meth­yl}benzamide monohydrate

In the title compound, C₂₀H₂₀Cl₂N₂O₂·H₂O, the piperidine ring adopts a chair conformation with the two substituent benzene rings inclined to one another [dihedral angle 84.63 (9)°]. In the crystal, the components are linked by Ow—H...O, N—H...Ow (w = water) and C—H...O hydrogen bonds, generating a sheet structure lying parallel to (101).

Crystal structure of 3-[4-(benz­yloxy)phen­yl]-2,3-di­hydro-1H-benzo[f]chromen-1-one

In the title compound, C₂₆H₂₀O₃, the pyran ring has a distorted half-chair conformation and its mean plane is inclined to the naphthalene ring system, to which it is fused, by 10.79 (9)°. The dihedral angles between the napthalene unit and the benzene and phenyl rings are 54.39 (9) and 52.65 (12)°, respectively, while the benzene and phenyl rings are inclined to one another by 74.80 (14)°. There is a short C—H...O contact in the chromen-1-one unit. In the crystal, mol­ecules are linked by two pairs of C—H...O hydrogen bonds, forming inversion dimers described by graph set motifs R₂²(8) and R₂²(10), giving rise to chains running parallel to (101). The chains are linked via C—H...π inter­actions, forming sheets lying parallel to (010).

Crystal structure of 4-methyl-N-{[1-(4-methyl­benzo­yl)piperidin-4-yl]meth­yl}benzamide

In the title compound, C₂₂H₂₇N₂O₂, the piperidine ring adopts a half-chair conformation with the benzene rings inclined in a trans orientation with respect to the piperidine ring [dihedral angle between the benzene rings = 89.1 (1)°]. In the crystal, a three-centre asymmetric N—H...O/C—H...O hydrogen-bonding inter­action leads to the formation of chains extending along the a-axis direction.

Crystal structure of (2E)-1-(4-hy­droxy-3-meth­oxy­phen­yl)-3-(4-hy­droxy­phen­yl)prop-2-en-1-one

In the title moleclue, C₁₆H₁₄O₄, the dihedral angle between the benzene rings is 16.1 (3)°. The meth­oxy group is essentially coplanar with the benzene ring to which it is attached, with a C—O—C[pdbond]C torsion angle of 5.5 (9)°. In the crystal, mol­ecules are linked by O—H...O and bifurcated O—H...(O,O) hydrogen bonds, forming a three-dimensional network. The structure was refined as a two-component inversion twin.

Crystal structure of 1-[2,4-bis(4-methoxy­phenyl)-3-azabicyclo[3.3.1]nonan-3-yl]ethanone

In the title compound, C₂₄H₂₉NO₃, the aza­bicycle contains two six-membered rings, viz. a cyclo­hexane ring and a piperidine ring. The first adopts a chair conformation and the second a half-chair conformation. The dihedral angle between their mean planes is 86.21 (13)°, indicating that they are almost perpendicular to one another. The dihedral angle between the planes of the 4-meth­oxy­phenyl rings is 17.51 (13)°, and they make dihedral angles of 81.9 (3) and 81.3 (3)° with the ethan-1-one group. In the crystal, mol­ecules are linked by C—H...π inter­actions forming chains along [10-1].

Crystal structure of (2E)-3-(3-eth­oxy-4-hy­droxy­phen­yl)-1-(4-hy­droxy­phen­yl)prop-2-en-1-one

In the title compound, C₁₇H₁₆O₄, the dihedral angle between the benzene rings is 21.22 (1)° and the mean plane of the prop-2-en-1-one group makes dihedral angles of 10.60 (1) and 11.28 (1)°, respectively, with those of the hy­droxy­phenyl and eth­oxy­phenyl rings. The eth­oxy substituent forms a dihedral angle of 88.79 (2)° with the the prop-2-en-1-one group, which is found to be slightly twisted. In the crystal, phenolic O—H...O hydrogen bonds to the carbonyl O atom form a two-dimensional supra­molecular network structure lying parallel to (010).