9-(4-Hy­droxy-3-meth­oxy­phen­yl)-3,3,6,6-tetra­methyl-1,2,3,4,5,6,7,8,9,10-deca­hydro­acridine-1,8-dione

In the title mol­ecule, C₂₄H₂₉NO₄, the central ring of the acridinedione system adopts a flat boat conformation and the four essentially planar atoms of this ring [maximum deviation = 0.001 (2) Å] form a dihedral angle of 85.99 (12)° with the benzene ring. The two outer rings of the acridinedione system adopt sofa conformations. In the crystal, O—H...O and N—H...O hydrogen bonds link the mol­ecules, forming a two-dimensional network parallel to (100).

9-(3-Fluoro­phen­yl)-3,3,6,6-tetra­methyl-1,2,3,4,5,6,7,8,9,10-deca­hydro­acridine-1,8-dione

In the title mol­ecule, C₂₃H₂₆FNO₂, the central ring of the acridinedione system adopts a slight boat conformation and the four essentially planar atoms of this ring [maximum deviation = 0.019 (1) Å] form a dihedral angle of 89.98 (6)° with the benzene ring. The two outer rings of the acridinedione system adopt sofa conformations. In the crystal, N—H...O hydrogen bonds link the mol­ecules, forming chains along [001].

2-Amino-7,7-dimethyl-5-oxo-4-[3-(trifluoro­meth­yl)phen­yl]-1,4,5,6,7,8-hexa­hydro­quinoline-3-carbonitrile

In the title mol­ecule, C₁₉H₁₈F₃N₃O, the dihydro­pyridine and cyclo­hexene rings both adopt sofa conformations. The five essentially planar atoms of the dihydro­pyridine ring [maximum deviation = 0.039 (2) Å] form a dihedral angle of 88.19 (8)° with the benzene ring. The F atoms of the trifluoro­methyl group were refined as disordered over two sets of sites in a 0.840 (3):0.160 (3) ratio. In the crystal, N—H...O and N—H...N hydrogen bonds link mol­ecules into a two-dimensional network parallel to (100).

A second monoclinic polymorph of 4-[(E)-(4-benzyl­oxybenzyl­idene)amino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

In the title compound, C₂₅H₂₃N₃O₂, the central benzene ring makes dihedral angles of 77.14 (8) and 87.7 (2)° with the terminal benzene rings and an angle of 1.9 (1)° with the pyrazolone ring. The benzene ring and the N atom of the pyrazole ring bearing the phenyl substituent are disordered over two sets of sites with an occupancy ratio of 0.71 (2):0.29 (2). The N atoms of the pyrazole ring have a pyramidal environment, the sums of the valence angles around them being 354.6 (3) and 352.0 (6)/349.5 (15)°. In the crystal, mol­ecules are packed into layers parallel to the ac plane. The other monoclinic polymorphic form was reported recently [Dutkiewicz et al. (2012). Acta Cryst. E68, o1324].

5-Benzoyl-4-(4-fluoro­phen­yl)-3,4-dihydro­pyrimidin-2(1H)-one

In the title mol­ecule, C₁₇H₁₃FN₂O₂, the 3,4-dihydro­pyrimidine ring adopts a flattened sofa conformation with the flap atom (which bears the fluoro­phenyl substituent) deviating from the plane defined by the remaining five ring atoms by 0.281 (2) Å. This plane forms dihedral angles of 85.98 (6) and 60.63 (6)° with the 4-fluoro­phenyl and benzoyl-phenyl rings, respectively. The dihedral angle between the 4-fluoro­phenyl group and the benzene ring is 71.78 (6)°. In the crystal, N—H...O hydrogen bonds link mol­ecules into inversion dimers that are further connected by another N—H...O inter­action into a two-dimensional supra­molecular structure parallel to (101).

9-(3,4-Dimeth­oxy­phen­yl)-3,3,6,6-tetra­methyl-1,2,3,4,5,6,7,8,9,10-deca­hydro­acridine-1,8-dione

The asymmetric unit of the title compound, C₂₅H₃₁NO₄, contains two independent mol­ecules. In one mol­ecule, the benzene ring and an attached meth­oxy group were refined as disordered over two sets of sites in a 0.65 (4): 0.35 (4) ratio. In both mol­ecules, the central ring of the acridinedione system adopts a flattened boat conformation. The four essentially planar atoms of this ring [maximum deviations = 0.006 (5) Å in both mol­ecules] forms dihedral angles of 86.8 (2) and 87.6 (2)°, respectively, with the major and minor components in the disordered benzene ring and 87.3 (2)° with the benzene ring in the fully ordered mol­ecule. The two outer rings of the acridinedione system adopt sofa conformations in both mol­ecules. In the crystal, N—H...O hydrogen bonds form two independent chains along [100]. C—H...O hydrogen bonds link the chains, forming a three-dimensional network.

Ethyl 4-anilino-2,6-bis­(4-fluoro­phen­yl)-1-phenyl-1,2,5,6-tetra­hydro­pyridine-3-carboxyl­ate

In the title compound, C₃₂H₂₈F₂N₂O₂, the tetra­hydro­pyridine ring adopts a distorted boat conformation. The two fluoro­phenyl groups are attached to the tetra­hydro­pyridine ring in a trans orientation. The dihedral angle between the planes of the fluoro-substituted rings is 57.0 (1)°. The amino group and carbonyl O atom are involved in intra­molecular hydrogen bonding. In the crystal, weak C—H...O, C—H...F and C—H...π inter­actions link the mol­ecules into columns along [010].

Methyl 4-(4-fluoro­anilino)-1,2,6-tris­(4-fluoro­phen­yl)-1,2,5,6-tetra­hydro­pyri­dine-3-carboxyl­ate

In the title mol­ecule, C₃₁H₂₄F₄N₂O₂, the tetra­hydro­pyridine ring adopts a distorted boat conformation. An intra­molecular N—H...O hydrogen bond is formed by the amino group and ccarboxyl C=O atom. The crystal structure features weak C—H...F and C—H...O inter­actions.

2-Amino-7,7-dimethyl-5-oxo-4-[3-(trifluoro­meth­yl)phen­yl]-5,6,7,8-tetra­hydro-4H-chromene-3-carbonitrile

In the title mol­ecule, C₁₉H₁₇F₃N₂O₂, the fused cyclo­hexene and pyran rings adopt sofa and flattened boat conformations, respectively. The four essentially planar atoms of the pyran ring [maximum deviation = 0.008 (2) Å] form a dihedral angle of 88.13 (9)° with the benzene ring. The F atoms of the trifluoro­methyl group were refined as disordered over three sets of sites in a 0.507 (7):0.330 (7):0.163 (3) ratio. In the crystal, mol­ecules are connected into inversion dimers via pairs of N—H...N hydrogen bonds and these dimers are further linked by N—H...O hydrogen bonds into a two-dimensional network parallel to (100).

2-[(Dimethyl­amino)­methyl­idene]propane­dinitrile

In the title moleclue, C₆H₇N₃, the mean plane of the dimethyl­amino group [maximum deviation = 0.006 (2) Å] forms a dihedral angle of 7.95 (18)° with the mean plane of the propane­dinitrile fragment [maximum deviation = 0.008 (2) Å]. In the crystal, weak C—H...N hydrogen bonds link the mol­ecules into a three-dimensional network.

Ethyl 2,6-bis­(4-chloro­phen­yl)-4-(4-methyl­anilino)-1-(4-methyl­phen­yl)-1,2,5,6-tetra­hydro­pyridine-3-carboxyl­ate

In the title mol­ecule, C₃₄H₃₂Cl₂N₂O₂, the tetra­hydro­pyridine ring adopts a distorted boat conformation and both 4-chloro­phenyl substituents are in axial positions. An intra­molecular N—H...O hydrogen bond is formed by the amino group and carbonyl O atom. In the crystal, weak C—H...Cl inter­actions link the mol­ecules into chains along [010].

Ethyl 2,6-bis­(4-chloro­phen­yl)-4-(4-fluoro­anilino)-1-(4-fluoro­phen­yl)-1,2,5,6-tetra­hydro­pyridine-3-carboxyl­ate

In the title compound, C₃₂H₂₆Cl₂F₂N₂O₂, the tetra­hydro­pyridine ring adopts a distorted boat conformation. The chlorophenyl rings are inclined to one another by 55.2 (1)°, while for the fluorophenyl rings the dihedral angle is 80.7 (1)°. The amino group and carbonyl O atom are involved in an intra­molecular N—H...O hydrogen bond. In the crystal, weak C—H...O, C—H...F and C—H...Cl inter­actions link the mol­ecules into a three-dimensional network.

5-Bromo-2-chloro­pyrimidin-4-amine

In the title compound, C₄H₃BrClN₃, the pyrimidine ring is essentially planar (r.m.s. deviation from the plane = 0.087 Å). In the crystal, pairs of N—H...N hydrogen bonds connect the mol­ecules into inversion dimers; these are connected by further N—H...N hydrogen bonds into a two-dimensional framework parallel to the bc plane.

Ethyl 2-(quinolin-8-yl­oxy)acetate monohydrate

In the title compound, C₁₃H₁₃NO₃·H₂O, the dihedral angle between the ethyl ester group [C—C—O—C(=O); maximum deviation = 0.003 (2) Å] and the quinoline ring system is 7.94 (12)°. The water solvent mol­ecule is linked to the title mol­ecule via O—H...O and O—H...N hydrogen bonds. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming chains propagating along [100].

(R)-2-Cyano-N-(1-phenyl­eth­yl)acetamide

In the title compound, C₁₁H₁₂N₂O, the dihedral angle between the acetamide group and the benzene ring is 68.7 (1)°. In the crystal, N—H...O and weak C—H...O hydrogen bonds link the mol­ecules into chains along the a-axis direction.

3-Methyl-4-{(E)-[4-(methyl­sulfan­yl)benzyl­idene]amino}-1H-1,2,4-triazole-5(4H)-thione

In the title mol­ecule, C₁₁H₁₂N₄S₂, the dihedral angle between the triazole and benzene rings is 21.31 (5)°. A weak intra­molecular C—H...S hydrogen bond generates an S(6) ring motif. In the crystal, pairs of N—H...S hydrogen bonds form inversion dimers. In addition, π–π inter­actions are observed between the benzene rings, with a centroid–centroid separation of 3.7599 (11) Å.

4-Amino-3-(3-meth­oxy­benz­yl)-1H-1,2,4-triazole-5(4H)-thione

In the title mol­ecule, C₁₀H₁₂N₄SO, the triazole ring forms a dihedral angle of 73.0 (5)° with the benzene ring. The meth­oxy group is approximtely coplanar with the benzene ring with a C[pdbond]C—O—C_meth­yl torsion angle of 4.7 (3)°. In the crystal, N—H...S hydrogen bonds connect pairs of inversion-related mol­ecules, which are in turn connected by N—H...N hydrogen bonds into chains of rings along [010]. Weak C—H...O hydrogen bonds connect these chains into a two-dimensional network parallel to (-102).

2-(1-Amino-4-tert-butyl­cyclo­hex­yl)acetic acid (tBu-β^3,3-Ac₆c) hemihydrate

The title compound, C₁₂H₂₃NO₂·0.5H₂O, crystallized with two 2-(1-amino-4-tert-butylcyclohexyl)acetic acid mol­ecules, which are present as zwitterions, and one water mol­ecule in the asymmetric unit. The mol­ecular structure of each zwitterion is stabilized by an intra­molecular six-membered (C₆ ) N—H...O hydrogen bond. In the crystal, the two independent zwitterions are linked head-to-head by N—H...O hydrogen bonds. Further O—H...O and N—H...O hydrogen bonds link the zwitterions and the water molecules, forming sandwich-like layers, with a hydrophilic filling and a hydrophobic exterior, lying parallel to the ab plane.

2-Benzoyl-4-chloro­phenyl benzoate

In the title compound, C₂₀H₁₃ClO₃, the dihedral angles between the benzoate and the chloro­benzene and benzoyl rings are 68.82 (5) and 53.76 (6)°, respectively, while the dihedral angle between the benzoyl and benzoate rings is 81.17 (5)°. The eight atoms of the benzoyl residue are essentially planar with the exception of the O atom which lies 0.1860 (5) Å out of their mean plane (r.m.s. deviation = 0.97 Å). The nine atoms of benzoate residue are also essentially planar (r.m.s. deviation = 0.20 Å) with the ester O atom showing the greatest deviation [0.407 (12) Å] from their mean plane. In the crystal, mol­ecules are connected into centrosymmetric dimers by pairs of C—H...O hydrogen bonds.

(2Z)-3-(2,4-Di­chloro­phen­yl)-3-hy­droxy-N-phenyl­prop-2-ene­thio­amide

In the title mol­ecule, C₁₅H₁₁Cl₂NOS, the dihedral angle between the phenyl and benzene rings is 72.24 (1)°. In the crystal, pairs of N—H...S hydrogen bonds form dimers with twofold rotational symmetry. The dimers are connected by weak C—H...O hydrogen bonds, forming a two-dimensional network parallel to (001). An intra­molecular O—H...S hydrogen bond is also observed.

(Z)-3-Methyl-4-[1-(4-methyl­anilino)propyl­idene]-1-phenyl-1H-pyrazol-5(4H)-one

In the title mol­ecule, C₂₀H₂₁N₃O, the central pyrazole ring forms dihedral angles of 4.75 (9) and 49.11 (9)°, respectively, with the phenyl and methyl-substituted benzene rings. The dihedral angle between the phenyl and benzene rings is 51.76 (8)°. The amino group and carbonyl O atom are involved in an intra­molecular N—H...O hydrogen bond. In the crystal, π–π inter­actions are observed between benzene rings [centroid–centroid seperation = 3.892 (2) Å] and pyrazole rings [centroid–centroid seperation = 3.626 (2) Å], forming chains along [111]. The H atoms of the methyl group on the p-tolyl substituent were refined as disordered over two sets of sites in a 0.60 (4):0.40 (4) ratio.

5-(5′-Fluoro-2′-meth­oxy­biphenyl-3-yl)-1,3,4-oxa­diazol-2-amine

In the title compound, C₁₅H₁₂FN₃O₂, the dihedral angles between the central benzene ring and the pendant benzene and oxa­diazole rings are 45.05 (13) and 15.60 (14)°, respectively. The C atom of the meth­oxy group is roughly coplanar with its attached ring [displacement = 0.178 (4) Å]. In the crystal, N—H...N hydrogen bonds link the mol­ecules into [010] chains. Weak C—H...π inter­actions are also observed.