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3-Hydr-oxy-4-nitro-phenyl acetate.

ABSTRACT: In the mol-ecule of the title compound, C(8)H(7)NO(5), the acetate group is oriented with respect to the aromatic ring at a dihedral angle of 85.30 (3)°. An intra-molecular O-H⋯O hydrogen bond results in the formation of a non-planar six-membered ring, adopting an envelope conformation. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules.

SUBMITTER: Liu C

PROVIDER: S-EPMC2967961 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2-Hydr-oxy-3-nitro-N-phenyl-benzamide.

Project description:The asymmetric unit of the title compound, C(13)H(10)N(2)O(4), contains two crystallographically independent mol-ecules. The aromatic rings are oriented at dihedral angles of 24.39?(3) and 7.47?(3)° in the two mol-ecules and intra-molecular N-H?O and O-H?O hydrogen bonds result in the formation of two planar six-membered rings. In the crystal structure, inter-molecular O-H?O and C-H?O hydrogen bonds link the mol-ecules into chains, forming R(2) (2)(10) ring motifs. Weak ?-? contacts between the benzene and phenyl rings [centroid-centroid distance = 3.955?(3)?Å] may further stabilize the structure.

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6,8-Dibromo-5-hydr-oxy-4-oxo-2-phenyl-4H-chromen-7-yl acetate.

Project description:In the title compound, C(17)H(10)Br(2)O(5), the chromene ring is almost planar with minimal puckering [total puckering amplitude = 0.067?(4)?Å]. The dihedral angle between chromeme ring system and phenyl ring is 3.7?(2)°. The crystal structure is stabilized by intermolecular C-H?O inter-actions and an intramolecular O-H?O hydrogen bond also occurs.

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Project description:The asymmetric unit of title compound, C(7)H(6)N(2)O(4), contains two mol-ecules, one of which has a disordered nitro group with an occupancy ratio of 0.517?(9):0.483?(9) for the O atoms. Both mol-ecules contain an intra-molecular O-H?O hydrogen bond. In the crystal, both mol-ecules form inversion dimers linked by pairs of N-H?O hydrogen bonds, resulting in R(2) (2)(8) ring motifs. The dimers are connected by further N-H?O links and weak C-H?O inter-actions, resulting in a layered motif.

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Project description:The title compound, C(10)H(5)NO(5), features an intra-molecular O-H?O hydrogen bond, forming a six-membered ring with an S(6) ring motif. The nitro group makes a dihedral angle of 71.66?(5)° with the plane of the benzene ring to which it is bound. The two rings are almost coplanar, with a dihedral angle of 4.44?(5)°. Short inter-molecular distances between the centroids of the six-membered rings [3.7188?(6)-3.8299?(6)?Å] indicate the existence of ?-? inter-actions. The inter-esting features of the crystal structure are the short inter-molecular O?O and O?N inter-actions. The crystal packing is stabilized by intra-molecular O-H?O and inter-molecular C-H?O (×3) hydrogen bonds, and C-H?? inter-actions.

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