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author:("Saeed, sumaya")
1.  4-Meth­oxy-N-(4-meth­oxy-2-nitro­phen­yl)benzamide 
In the title compound, C15H14N2O5, the central amide C—C(=O)—N—C unit forms dihedral angles of 28.17 (13) and 26.47 (13)° with the two benzene rings, whereas the two benzene rings are almost coplanar, making a dihedral angle of 4.52 (13)°. The two meth­oxy and the nitro substituents are almost coplanar with their attached benzene rings, with C—O—C—C torsion angles of −1.3 (4) and −4.6 (4)°, and an O—N—C—C torsion angle of 17.1 (3)°. In the crystal, mol­ecules are linked via C—H⋯O and N—H⋯O inter­actions, forming a tape running along the b axis.
doi:10.1107/S1600536812037701
PMCID: PMC3470382  PMID: 23125795
2.  2-Azido-1-(4-nitro­phen­yl)ethanone 
In the title compound, C8H6N4O3, the ketone [C—C(=O)—C] and nitro groups are tilted with respect to the benzene ring by 18.92 (6) and 24.11 (15)°, respectively. In the crystal, mol­ecules are linked into inter­woven chains running parallel to the [100] direction by C—H⋯N hydrogen bonds and weak π–π stacking inter­actions, with centroid–centroid separations of 3.897 (3) Å.
doi:10.1107/S1600536812021241
PMCID: PMC3379503  PMID: 22719701
3.  2-Azido-1-(4-methyl­phen­yl)ethanone 
In the mol­ecule of the title compound, C9H9N3O, the angle formed by the least-squares line through the azide group with the normal to the plane of the benzene plane ring is 46.62 (16)°. The crystal structure features C—H⋯O hydrogen bonds, which link the mol­ecules into zigzag chains running parallel to [010].
doi:10.1107/S1600536812018491
PMCID: PMC3379216  PMID: 22719414
4.  2-Azido-1-(4-fluoro­phen­yl)ethanone 
The crystal structure of the title compound, C8H6FN3O, is stabilized by C—H⋯O hydrogen bonds, which link the mol­ecules into chains running parallel to the a axis.
doi:10.1107/S1600536812013426
PMCID: PMC3344193  PMID: 22606196

Results 1-4 (4)