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1.  2-sec-Butyl-1-(2-hy­droxy­eth­yl)-1H-benzimidazole-5-carboxylic acid 
In the title compound, C14H18N2O3, the carb­oxy­lic group is tilted by 12.00 (4)° with respect to the mean plane throught the benzimidazole ring system. The alcohol and carboxyl hydroxy groups are involved in intermolecular O—H⋯O and O—H⋯N hydrogen bonds, forming a two-dimensional network extending parallel the ab plane. The network is further stabilized by weak C—H⋯O inter­actions. The sec-butyl group is disordered over two sets of sites with refined occupancies of 0.484 (4) and 0.516 (4).
doi:10.1107/S1600536812023884
PMCID: PMC3393269  PMID: 22807826
2.  Ethyl 1-(2-hy­droxy­eth­yl)-2-[2-(methyl­sulfan­yl)eth­yl]-1H-benzimidazole-5-carboxyl­ate 
In the crystal structure of the title compound, C15H20N2O3S, the hy­droxy group is involved in the formation of O—H⋯N hydrogen bonds, which link two mol­ecules into a centrosymmetric dimer. Weak C—H⋯O hydrogen bonds further link these dimers into chains propagating along the a axis. The crystal packing exhibits π–π inter­actions between the five- and six-membered rings of neighbouring mol­ecules [centroid–centroid distance = 3.819 (2) Å] and short inter­molecular S⋯S contacts of 3.495 (1) Å.
doi:10.1107/S160053681105389X
PMCID: PMC3254533  PMID: 22259479
3.  Ethyl 2-(4-bromo­phen­yl)-1-sec-butyl-1H-benzimidazole-5-carboxyl­ate 
In the title compound, C20H21BrN2O2, the bromo­phenyl ring is twisted by 40.13 (8)° from the benzimidazole mean plane and the Br atom deviates by 0.753 (1) Å from that plane. The sec-butyl group is disordered over two conformations in a 0.898 (5):0.102 (5) ratio. In the crystal, mol­ecules related by translation along [10] are linked into chains via weak C—H⋯Br hydrogen bonds.
doi:10.1107/S1600536811048999
PMCID: PMC3239083  PMID: 22199931
4.  Ethyl 1-sec-butyl-2-(4-fluoro­phen­yl)-1H-benzimidazole-5-carboxyl­ate 
In the title compound, C20H21FN2O2, the benzene ring and the benzimidazole ring system are inclined at a dihedral angle of 44.40 (9)°. In the crystal, mol­ecules are linked by inter­molecular C—H⋯O hydrogen bonds, forming a zigzag chain along the b-axis direction. An intra­molecular C—H⋯π inter­action is also observed.
doi:10.1107/S1600536811041663
PMCID: PMC3247350  PMID: 22219968
5.  Ethyl 1-(2-hy­droxy­eth­yl)-2-propyl-1H-benzimidazole-5-carboxyl­ate 
In the title compound, C15H20N2O3, the benzimidazole ring is essentially planar, with a maximum deviation from the mean plane of 0.012 (1) Å. The crystal structure is stabilized by inter­molecular O—H⋯N hydrogen bonds, forming centrosymmetric dimers, which are connected in the [100] direction through weak C—H⋯O contacts.
doi:10.1107/S1600536811037421
PMCID: PMC3201285  PMID: 22058794
6.  Ethyl 4-(2-hydroxy­ethyl­amino)-3-nitro­benzoate 
In the title compound, C11H14N2O5, the mol­ecular structure is stabilized by an intra­molecular N—H⋯O hydrogen bond, which generates an S(6) ring motif. The nitro group is twisted slightly from the attached benzene ring, forming a dihedral angle of 5.2 (2)°. In the crystal packing, inter­molecular O—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network. The crystal studied was a non-merohedral twin, the refined ratio of the twin components being 0.264 (2):0.736 (2).
doi:10.1107/S1600536810008147
PMCID: PMC2983846  PMID: 21580671
7.  Ethyl 1-sec-butyl-2-phenyl-1H-benzimidazole-5-carboxyl­ate 
In the title mol­ecule, C20H22N2O2, the benzimidazole ring system is essentially planar, with a maximum deviation of 0.024 (1) Å. The dihedral angle between the phenyl and benzimidazole ring system is 43.71 (5)°. The atoms of the butyl group are disordered over two sets of sites with occupancies of 0.900 (4) and 0.100 (4). In the crystal structure, mol­ecules are connected by weak inter­molecular C—H⋯O hydrogen bonds, forming chains along the b axis. The crystal structure is further stabilized by C—H⋯π inter­actions.
doi:10.1107/S160053681000872X
PMCID: PMC2984087  PMID: 21580635
8.  Ethyl 1-tert-butyl-2-(4-methoxy­phen­yl)-1H-benzimidazole-5-carboxyl­ate 
In the title mol­ecule, C21H24N2O3, the imidazole ring is essentially planar, with a maxium deviation of 0.015 (1) Å. The dihedral angle between the benzene and imidazole rings is 65.47 (6)°. The crystal packing is stabilized by weak inter­molecular C—H⋯O and C—H⋯N hydrogen bonds, forming zigzag chains along the c axis. The crystal structure is further stabilized by C—H⋯π inter­actions.
doi:10.1107/S1600536810007956
PMCID: PMC2984033  PMID: 21580619
9.  Ethyl 4-butyl­amino-3-nitro­benzoate 
In the crystal structure of the title compound, C13H18N2O4, the asymmetric unit consists of three crystallographically independent ethyl 4-butyl­amino-3-nitro­benzoate mol­ecules. There is an intra­molecular N—H⋯O hydrogen bond in each mol­ecule, which generates an S(6) ring motif. The structure is stabilized by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds.
doi:10.1107/S1600536809029754
PMCID: PMC2970083  PMID: 21577493
10.  4-tert-Butyl­amino-3-nitro­benzoic acid 
In the title compound, C11H14N2O4, all non-H atoms lie in a mirror plane except for one of the methyl groups which deviates from the mirror plane by 0.919 (3) Å and is twisted by a torsion angle of 62.9 (2)°. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal packing, the mol­ecules are linked together by O—H⋯O hydrogen bonds, forming dimers with graph-set motif R 2 2(8) which propagate along the a-axis direction. C—H⋯O contacts link adjacent dimers with a graph-set motif C 2 2(7), forming chains along b, and further consolidate the structure into a three-dimensional network. The crystal packing is further strengthened by short inter­molecular O⋯O=C [2.655 (4) Å] contacts.
doi:10.1107/S1600536809015487
PMCID: PMC2969589  PMID: 21583101
11.  4-Ethyl­amino-3-nitro­benzoic acid 
In the title compound, C9H10N2O4, an intra­molecular N—H⋯O hydrogen-bond inter­action generates an S(6) ring motif. The nitro group is slightly twisted away from its attached benzene ring [dihedral angle = 15.29 (15)°]. In the crystal structure, mol­ecules are stacked down the a axis caused by short O⋯O(−1−x, −y, 2−z) contacts of 2.6481 (16) Å involving the O atoms of the nitro groups. The crystal packing is consolidated by inter­molecular O—H⋯O hydrogen bonds, linking the mol­ecules into centrosymmetric dimers.
doi:10.1107/S1600536809014196
PMCID: PMC2977758  PMID: 21583894

Results 1-11 (11)