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1.  (E)-3-(4-Bromo­phen­yl)-3-[3-(4-bromo­phen­yl)-1H-pyrazol-1-yl]prop-2-enal 
There are two crystallographically independent mol­ecules in the asymmetric unit of the title compound, C18H12Br2N2O. In each mol­ecule, one of the bromo­phenyl rings lies almost in the plane of pyrazole unit [dihedral angles of 5.8 (3)° in the first mol­ecule and and 5.1 (3)° in the second] while the other ring is approximately perpendicular to it [dihedral angles of 80.3 (3) and 76.5 (3)°]. The crystal packing shows inter­molecular C—H⋯O inter­actions. The crystal studied was a racemic twin.
PMCID: PMC2979980  PMID: 21579715
2.  3-(4-Chloro­phen­yl)-1-[(E)-1-(4-chloro­phen­yl)-2-(4-methyl­phenyl­sulfan­yl)ethen­yl]-4-(4-methyl­phenyl­sulfan­yl)-1H-pyrazole 
In the title compound, C31H24Cl2N2S2, the pyrazole ring adopts planar conformation with a maximum deviation of 0.002 (2) Å. The chloro­phenyl rings are twisted out of the plane of the pyrazole ring by 75.1 (1) and 39.5 (1)°. The crystal packing is controlled by weak intermolecular C—H⋯π interactions.
PMCID: PMC2971206  PMID: 21578467
3.  3,3′-(p-Phenyl­ene)bis­(3,4-dihydro-2H-1,3-benzoxazine) 
Mol­ecules of the title compound, C22H20N2O2, are situated on crystallographic centres of symmetry. The oxazinane ring adopts a sofa conformation. Mol­ecules are linked into cyclic centrosymmetric dimers via C—H⋯O hydrogen bonds with the motif R 2 2(6). In addition to the C—H⋯O inter­actions, the crystal structure is also stabilized by C—H⋯π inter­actions.
PMCID: PMC2968457  PMID: 21582236
4.  (E)-3-(4-Methyl­phen­yl)-3-[3-(4-methyl­phen­yl)-1H-pyrazol-1-yl]-2-propenal 
In the title compound, C20H18N2O, the pyrazole ring adopts a planar conformation. The C—N bond lengths in the pyrazole ring are shorter than a standard C—N single bond (1.443 Å), but longer than a standard double bond (1.269 Å), indicating electron delocalization. The propenal group assumes an extended conformation. Inter­molecular C—H⋯O hydrogen bonds connect mol­ecules into cyclic centrosymmetric R 2 2(26) dimers, which are cross-linked via C—H⋯π inter­actions.
PMCID: PMC2959754  PMID: 21581097
5.  4-(Cyclo­hexyl­sulfan­yl)-1-[(E)-2-(cyclo­hexyl­sulfan­yl)-1-phenyl­ethen­yl]-3-phenyl-1H-pyrazole 
In the title compound, C29H34N2S2, the pyrazole ring is planar and both cyclo­hexane rings adopt chair conformations. The dihedral angles between the pyrazole ring and the two benzene rings are 59.9 (2) and 19.8 (2)°. The conformation and packing of the mol­ecules in the unit cell are stabilized by a weak intra­molecular C—H⋯S and C—H⋯N interactions, in addition to van der Waals forces.
PMCID: PMC2959566  PMID: 21580994
6.  1-(2,4-Dinitro­phenyl)-3-(4-methyl­phenyl)-4-phenyl­sulfanyl-1H-pyrazole 
In the title compound, C22H16N4O4S, the dihedral angles between the pyrazole ring and the pendant aromatic rings are 26.2 (1), 41.1 (1) and 89.5 (1)°. In the crystal structure, an intermolecular C—H⋯N bond helps to establish the packing. A short C⋯C contact of 3.110 (12) Å is observed between the C atom of the pyrazole CH group and one of the α-C atoms of the 4-methyl­phenyl ring.
PMCID: PMC2959740  PMID: 21580957
7.  4-(4-Chloro­phenyl­sulfan­yl)-1-[(E)-2-(4-chloro­phenyl­sulfan­yl)-1-phenyl­ethen­yl]-3-phenyl-1H-pyrazole 
In the title compound, C29H20Cl2N2S2, the pyrazole ring adopts a planar conformation. The chlorophenyl rings are twisted from the pyrazole ring at angles of 52.74 (14) and 29.92 (13)°, respectively. The crystal structure is stabilized by C—H⋯N and C—H⋯π inter­actions.
PMCID: PMC2959571  PMID: 21580921
8.  1-[(E)-2-Formyl-1-(4-methyl­phen­yl)ethen­yl]-3-(4-methyl­phen­yl)pyrazole-4-carbaldehyde 
In the crystal structure of the title compound, C21H18N2O2, mol­ecules are linked through C—H⋯O inter­actions. Two symmetry-related mol­ecules form a cyclic centrosymmetric R 2 2(20) dimer. These dimers are further connected into chains running along the b axis.
PMCID: PMC2959333  PMID: 21201101
9.  3-Cyclo­hexyl­sulfan­yl-2-(4-methyl­phen­yl)-5,7-dinitro-1H-indole 
In the title compound, C21H21N3O4S, the cyclo­hexane ring adopts a chair conformation. The nitro and methyl­phenyl groups are all coplanar with the indole ring system. Intra­molecular N—H⋯O and C—H⋯S hydrogen bonds generate S(6) ring motifs. The mol­ecules form R 2 2(20) centrosymmetric dimers via inter­molecular C—H⋯O hydrogen bonds. A short O⋯O contact [2.842 (2) Å] is observed in the dimer.
PMCID: PMC2959479  PMID: 21201102

Results 1-9 (9)