2-(Carbazol-9-yl)acetic acid

In the title compound, C14H11NO2, the tricyclic aromatic ring system is essentially planar [maximum deviation = 0.025 (2) Å]. The dihedral angle between the two benzene rings is 2.8 (5)°, while the carboxyl group forms a dihedral angle of 88.5 (1)° with the pyrrole ring. Inter­molecular O—H⋯O hydrogen bonds may contribute to the overall stabilization of the crystal structure

2-Chloro­ethyl 4-nitro­benzoate

The title compound, C9H8ClNO4, crystallizes with two mol­ecules in the asymmetric unit. In each mol­ecule, the carboxyl­ate group is nearly coplanar with the benzene ring, forming dihedral angles of 2.4 (1) and 4.9 (1)°. In the crystal, mol­ecules are linked through weak C—H⋯O and C—H⋯Cl hydrogen bonds. A short O⋯N contact of 2.7660 (19) Å occurs between the nitro groups of adjacent mol­ecules

Dimethyl 5-nitro­isophthalate

The nitro group in the title compound, C10H9NO6, is rotated by 10.9 (5)° out of the plane of the benzene ring

5,6,7,8-Tetra­hydro­naphthalene-1-carboxylic acid

In the mol­ecule of the title compound, C11H12O2, the cyclo­hexane ring adopts a half-chair conformation. In the crystal structure, mol­ecules are linked into centrosymmetric dimers by pairs of O—H⋯O hydrogen bonds, and the dimers are linked together by π–π inter­actions [centroid–centroid distance = 3.8310 (13) Å] and C—H⋯O bonds

Methyl 9H-carbazole-9-acetate

The title compound, C15H13NO2, was synthesized by N-alkyl­ation of methyl bromo­acetate with 9H-carbazole. The carbazole ring system is essentially planar (mean atomic deviation = 0.0346 Å) and makes a dihedral angle of 86.5 (7)° with the methyl acetate group. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure

Ethyl 4-chloro-3,5-dinitro­benzoate

In the title compound, C9H7ClN2O6, the nitro groups and the ester group make dihedral angles of 44.0 (1), 89.6 (1) and 164.1 (1)°, respectively, with the benzene ring. In the crystal, mol­ecules are linked through weak C—H⋯O hydrogen-bonding inter­actions. Mol­ecules are stacked via π–π inter­actions about inversion centers, with a centroid–centroid distance of 3.671 (2) Å

3,3,12,12-Tetra­methyl-1,5,10,14-tetra­oxa­dispiro­[5.2.5.2]hexa­deca­ne

The mol­ecule of the title compound, C16H28O4, is centrosymmetric. The cyclo­hexane ring and both six-membered dioxane rings adopt chair conformations. In the crystal, the mol­ecules lie in layers in the (100) planes and the shortest inter­molecular contacts are H⋯H (2.30 Å)

2-Isopropoxyphenyl N-methyl­carbamate

In the title compound, C11H15NO3, the mean planes of the carboxamide and isopropyl groups are inclined at 109.9 (1) and 128.7 (2)°, respectively, to the mean plane of the phen­oxy group. In the crystal structure, mol­ecules are stacked along the b axis, without any π–π inter­actions. The stacked columns are linked together by inter­molecular N—H⋯O hydrogen bonds, with an N⋯O distance of 2.842 (2) Å

4-(4-Ethoxy­benz­yl)-1,3-oxazolidin-2-one

In the title compound, C12H15NO3, the ethoxy­benzyl ring plane forms a dihedral angle of 60.3 (4)° with the mean plane of the oxazolidine ring. The mol­ecules are linked through N—H⋯O hydrogen bonds into a chain running in the b direction