2-(4-Bromo­phen­yl)-2-oxoethyl anthracene-9-carboxyl­ate

In the title compound, C23H15BrO3, the anthracene ring system is essentially planar [maximum deviation = 0.29 (2) Å] and makes a dihedral angle of 5.74 (8)° with the mean plane of the bromo-substituted benzene ring. An intra­molecular C—H⋯O hydrogen bond generates an S(9) ring motif. In the crystal, mol­ecules are linked by C—H⋯O inter­actions, forming a two-dimensional network parallel to the ac plane. π–π stacking inter­actions are observed between benzene rings [centroid–centroid distances = 3.5949 (14) and 3.5960 (13) Å]

2-(4-Chloro­phen­yl)-2-oxoethyl 4-methyl­benzoate

In the title compound, C16H13ClO3, the dihedral angle between the benzene rings is 80.74 (8)°. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules to form C(11) chains propagating in [010]

2-(4-Fluoro­phen­yl)-2-oxoethyl 4-meth­oxy­benzoate

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

2-(4-Bromo­phen­yl)-2-oxoethyl 4-hy­droxy­benzoate

In the title compound, C15H11BrO4, the dihedral angle between the aromatic rings is 66.77 (8)°. In the crystal, O—H⋯O, C—H⋯Br and C—H⋯O hydrogen bonds link the mol­ecules, forming layers lying parallel to (101). The crystal packing is further consolidated by C—H⋯π inter­actions and π–π stacking inter­actions [centroid–centroid distance = 3.5476 (7) Å]

2-(4-Chloro­phen­yl)-2-oxoethyl 4-hy­droxy­benzoate

The title compound, C15H11ClO4, consists of a chloro­benzene ring and a phenol ring which are linked together by a 1,4-dioxo-2-oxabutane-1,4-diyl group. The dihedral angle between the chloro­benzene and phenol rings is 65.70 (11)°. In the crystal, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into chains along [010]

Ethyl 1-(2,4-dichloro­benz­yl)-4-oxo-7-trifluoro­meth­yl-1,4-dihydro­quinoline-3-carboxyl­ate

In the title compound, C20H14Cl2F3NO3, the trifluromethyl group is disordered over two sets of sites in a 0.784 (10):0.216 (10) ratio. The quinoline ring system is essentially planar with a maximum deviation of 0.058 (2) Å for the N atom and forms dihedral angles of 89.23 (11) and 8.13 (17)°, respectively with the mean planes of the benzene ring and the carboxyl­ate group. In the crystal, pairs of weak C—H⋯O and C—H⋯F hydrogen bonds link mol­ecules into centrosymmetric dimers. The crystal structure is further stabilized by weak π–π [centroid–centroid distance = 3.624 (2) Å] inter­actions

2-(4-Bromo­phen­yl)-2-oxoethyl 4-methyl­benzoate

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

2-(4-Chloro­phen­yl)-2-oxoethyl 2-meth­oxy­benzoate

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

2-(4-Chloro­phen­yl)-2-oxoethyl 2,4-di­fluoro­benzoate

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

2-(4-Fluoro­phen­yl)-2-oxoethyl 3-(trifluoro­meth­yl)benzoate

In the title compound, C16H10F4O3, the fluoro­form group is disordered over two orientations with an occupancy ratio of 0.834 (4):0.166 (4). The dihedral angle between the two aromatic rings is 20.34 (9)°. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into layers lying parallel to the bc plane