The asymmetric unit of the title compound, C13H10F3NO3, contains two independent molecules with similar conformations. In the crystal, N—H⋯O hydrogen bonds link alternating independent molecules into chains in [-110]. In the chain, the quinoline planes of the independent molecules are almost perpendicular to each other, forming a dihedral angle of 89.8 (1)°. π–π interactions between the aromatic rings of quinoline bicycles related by inversion centres [for two independent centrosymmetric dimers, the shortest centroid–centroid distances are 3.495 (1) and 3.603 (1) Å] link the hydrogen-bonded chains into layers parallel to (110). Weak C—H⋯F and C—H⋯O interactions further consolidate the crystal packing.
In the title compound, C16H13FO4, the aromatic rings enclose an angle of 73.68 (6)°. In the crystal, C—H⋯O and C—H⋯F contacts connect the molecules into a three-dimensional network. The shortest intercentroid distance between two aromatic π-systems is 3.6679 (7) Å and is apparent between the fluorinated phenyl groups.
The title compound, C15H16F3NO4, is an N-substituted derivative of ortho-trifluoromethylaniline featuring a twofold Michael system. The least-squares planes defined by the atoms of the phenyl ring and the atoms of the Michael system enclose an angle of 15.52 (5)°. Apart from classical intramolecular N—H⋯O and N—H⋯F hydrogen bonds, intermolecular C—H⋯O contacts are observed, the latter connecting the molecules into chains along . The shortest intercentroid distance between two aromatic systems is 3.6875 (9) Å.
In the title compound, C16H13FO4, the dihedral angle between the benzene rings is 84.28 (8)°. In the crystal, C—H⋯F and C—H⋯O hydrogen bonds link the molecules to form a three-dimensional network. The crystal structure is consolidated by C—H⋯π interactions and short F⋯F contacts [2.7748 (14) Å] also occur.
The title compound, C16H13BrO3, consists of a toluene ring and a bromobenzene ring which are linked together by a 2-oxopropyl acetate group. The dihedral angle formed between the toluene and bromobenzene rings is 80.70 (7)°. In the crystal, intermolecular C—H⋯O hydrogen bonds link the molecules into a three-dimensional network.
In the title compound, C23H20F3N5O, the piperazine ring adopts a chair conformation. The quinoline ring makes dihedral angles of 56.61 (11), 49.94 (12) and 42.58 (14)° with the piperazine ring, the 1,3,4-oxadiazole ring and the benzene ring, respectively. An intramolecular C—H⋯O hydrogen bond generates an S(7) ring motif. In the crystal, molecules are linked into infinite chains along the b axis by C—H⋯N hydrogen bonds.
In the title compound, C16H13BrO3, the dihedral angle formed between the bromo- and methyl-substituted benzene rings is 66.66 (8)°. In the crystal, molecules are linked by intermolecular C—H⋯O hydrogen bonds, forming a two-dimensional network parallel to the ac plane. The crystal packing is further consolidated by C—H⋯π interactions.
The asymmetric unit of the title compound, C15H10BrClO3, consists of three crystallographically independent molecules. The dihedral angles between the benzene rings in the three molecules are 68.8 (2), 0.7 (3) and 66.1 (2)°. In the crystal, the three independent molecules are interconnected by C—H⋯O hydrogen bonds, leading to isolated trimers.
In the title compound, C16H13ClO4, the two benzene rings make a dihedral angle of 86.38 (8)°. In the crystal, intermolecular C—H⋯O hydrogen bonds link the molecules to form columns along the a axis. The molecules are also stabilized by a π–π stacking interaction, with a centroid–centroid distance of 3.7793 (10) Å between the inversion-related benzene rings.
In the title molecule, C16H13BrO4, the dihedral angle between the benzene rings is 85.92 (10)°. In the crystal, molecules are linked into chains along  via weak intermolecular C—H⋯O hydrogen bonds.
The asymmetric unit of title compound, C15H9ClF2O3, consists of two crystallographically independent molecules. The dihedral angle between the two terminal benzene rings in one molecule is 7.92 (14)°, while that in the other molecule is 73.50 (16)°. In the crystal, molecules are stacked into columns along the b axis by intermolecular C—H⋯O hydrogen bonds. A π–π interaction with a centroid-to-centroid distance of 3.747 (2) Å further stabilizes the crystal structure.
In the title compound, C16H10ClF3O3, the two benzene rings are slightly twisted from each other, with a dihedral angle of 15.50 (8)° between the planes. In the crystal, intermolecular C—H⋯O hydrogen bonds link the molecules into a layer parallel to the bc plane.
The asymmetric unit of the title compound, C15H10Br2O3, consists of three crystallographically independent molecules (A, B and C). The phenyl rings in molecules A, B and C make dihedral angles of 6.1 (3), 3.2 (2) and 54.6 (2)° to each other, respectively. In the crystal, molecules are linked into two-dimensional layers parallel to the ab plane by intermolecular C—H⋯O hydrogen bonds. The crystal structure is further stabilized by C—H⋯π interactions. The studied crystal is an inversion twin, the refined ratio of the twin components being 0.128 (8):0.872 (8).
In the title compound, C16H13BrO4, the benzene rings are almost perpendicular to each other, making a dihedral angle of 84.07 (8)°. In the crystal, the molecules are linked into chains along the a axis via intermolecular C—H⋯O hydrogen bonds. A C—H⋯π interaction is also observed.
In the title compound, C15H12O3, the terminal phenyl rings make a dihedral angle of 86.09 (9)° with each other. In the crystal, a pair of intermolecular C—H⋯O hydrogen bonds link the molecules, forming a dimer with an R
2(10) ring motif.