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1.  Ethyl 4-oxo-8-trifluoro­methyl-1,4-dihydro­quinoline-3-carboxyl­ate 
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.
doi:10.1107/S1600536812045321
PMCID: PMC3588845  PMID: 23468810
2.  2-(4-Fluoro­phen­yl)-2-oxoethyl 2-methoxy­benzoate 
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.
doi:10.1107/S1600536812002577
PMCID: PMC3275257  PMID: 22347113
3.  Diethyl 2-{[2-(trifluoro­meth­yl)anil­ino]methyl­idene}propane­dioate 
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 [110]. The shortest inter­centroid distance between two aromatic systems is 3.6875 (9) Å.
doi:10.1107/S1600536812002590
PMCID: PMC3275258  PMID: 22347114
4.  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.
doi:10.1107/S1600536811049233
PMCID: PMC3239086  PMID: 22199934
5.  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.
doi:10.1107/S1600536811045272
PMCID: PMC3238827  PMID: 22199680
6.  4-(4-Methyl­piperazin-1-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)-7-(trifluoro­meth­yl)quinoline 
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.
doi:10.1107/S1600536811044370
PMCID: PMC3247502  PMID: 22220120
7.  2-(4-Bromo­phen­yl)-2-oxoethyl 2-methyl­benzoate 
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.
doi:10.1107/S1600536811044564
PMCID: PMC3247503  PMID: 22220121
8.  2-(4-Bromo­phen­yl)-2-oxoethyl 4-chloro­benzoate 
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.
doi:10.1107/S1600536811022963
PMCID: PMC3151903  PMID: 21837113
9.  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.
doi:10.1107/S1600536811021246
PMCID: PMC3151969  PMID: 21837084
10.  2-(4-Bromo­phen­yl)-2-oxoethyl 2-meth­oxy­benzoate 
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 [100] via weak inter­molecular C—H⋯O hydrogen bonds.
doi:10.1107/S1600536811023002
PMCID: PMC3152007  PMID: 21837114
11.  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.
doi:10.1107/S1600536811020630
PMCID: PMC3151833  PMID: 21837007
12.  2-(4-Chloro­phen­yl)-2-oxoethyl 3-(trifluoro­meth­yl)benzoate 
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.
doi:10.1107/S1600536811020629
PMCID: PMC3152104  PMID: 21837005
13.  2-(4-Bromo­phen­yl)-2-oxoethyl 4-bromo­benzoate 
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).
doi:10.1107/S1600536811020654
PMCID: PMC3152043  PMID: 21836992
14.  2-(4-Bromo­phen­yl)-2-oxoethyl 4-meth­oxy­benzoate 
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.
doi:10.1107/S1600536811018988
PMCID: PMC3120282  PMID: 21754889
15.  2-Oxo-2-phenyl­ethyl benzoate 
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 2(10) ring motif.
doi:10.1107/S1600536811018976
PMCID: PMC3120516  PMID: 21754888

Results 1-15 (15)