3-(4-Meth­oxy­phen­yl)-5-methylisoxazole-4-carb­oxy­lic acid

In the title compound, C₁₂H₁₁NO₄, the dihedral angle between the benzene and isoxazole rings is 42.52 (8)°. The carb­oxy­lic acid group is close to being coplanar with the isoxazole ring [dihedral angle = 5.3 (2)°]. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R₂²(8) loops.

5-Methyl-3-phenyl­isoxazole-4-carb­oxy­lic acid

In the title compound, C₁₁H₉NO₃, the phenyl and isoxazole rings form a dihedral angle of 56.64 (8)°. The carb­oxy group is almost in the same plane as the isoxazole ring with a C—C—C—O torsion angle of −3.3 (2)°. In the crystal, pairs of O—H...O hydrogen bonds link the mol­ecules into head-to-head dimers. C—H...N hydrogen bonds and π–π stacking inter­actions between phenyl rings [centroid–centroid distance = 3.9614 (17)Å] link the dimers into a three-dimensional network.

Ethyl 5-methyl-3-phenyl­isoxazole-4-carboxyl­ate

In the title compound, C₁₃H₁₃NO₃, the dihedral angle between the phenyl and isoxazole rings is 43.40 (13)°. The eth­oxy­carbonyl group is rotated out of the plane of the isoxazole ring by 16.2 (13)°.

2-(1,3-Benzodioxol-5-yl)-3-phenyl­quinazolin-4(3H)-one

In the mol­ecule of the title compound, C₂₁H₁₄N₂O₃, the quinazoline ring system [maximum deviation = 0.076 (1) Å] makes dihedral angles of 40.57 (9) and 42.31 (11)°, respectively, with the phenyl and 1,3-benzodioxole rings. The dihedral angle between the phenyl ring and the 1,3-benzodioxole ring is 4.34 (10)°. In the crystal, C—H...O hydrogen bonds link the mol­ecules into infinite zigzag chains extending along [100].

Ethyl 1,4-bis­(4-chloro­phen­yl)-2-methyl-1H-pyrrole-3-carboxyl­ate

In the title mol­ecule, C₂₀H₁₇Cl₂NO₂, the pyrrole moiety makes dihedral angles of 63.42 (11) and 70.43 (12)° with the chlorobenzene rings. The eth­oxy­carbonyl unit is present in a synperiplanar conformation with respect to the pyrrole ring, as indicated by the dihedral angle of 14.5 (3)°. In the crystal, mol­ecules are linked into chains parallel to the a-axis direction by weak C—H...O hydrogen bonds.

2-Tri­fluoro­methyl-10H-benzo[4,5]imidazo[1,2-a]pyrimidin-4-one

In the mol­ecule of the title compound, C₁₁H₆F₃N₃O, the three fused rings of the benzo[4,5]imidazo[1,2-a]pyrimidine unit are essentially coplanar, the maximum deviation from the mean plane being 0.096 (2) Å. In the crystal, N—H...O hydrogen bonds link the mol­ecules into chains running along the b-axis direction.

5-Methyl-1,3-diphenyl-N-(5-phenyl-1,3,4-thia­diazol-2-yl)-1H-pyrazole-4-carboxamide

The asymmetric unit of the title compound C₂₅H₁₉N₅OS, contains two mol­ecules, A and B. In mol­ecule A, the dihedral angles between the pyrazole ring and the C-bound phenyl group, the N-bound phenyl group and the thia­diazole ring are 32.30 (14), 52.25 (14) and 34.94 (12)°, respectively. The corresponding angles in mol­ecule B are 33.32 (14), 50.67 (15), and 70.30 (12)°, respectively. In the crystal, the A and B mol­ecules are linked by pairs of N—H...N hydrogen bonds, generating R₂²(8) loops. This dimer linkage is reinforced by two C—H...O hydrogen bonds and one C—H...N hydrogen bond.

N′-Benzoyl-5-methyl-1,3-diphenyl-1H-pyrazole-4-carbohydrazide

In the title compound, C₂₄H₂₀N₄O₂, the pyrazole ring makes dihedral angles of 47.57 (10)° and 30.56 (11)° with its N-bound and C-bound phenyl groups, respectively. The C—N—N—C group that links the two carbonyls has a torsion angle of 81.5 (2)°. The torsion angles between the carbonyl groups and their adjacent pyrazole and phenyl rings are 125.89 (19) and 164.22 (17)°, respectively. In the crystal, pairs of mol­ecules are linked by N—H...O hydrogen bonds into R₂²(10) ring motifs, which in turn link to form chains that propagate parallel to the c-axis direction.