N-(2,5-Dichloro­phen­yl)maleamic acid

The asymmetric unit of the title compound, C10H7Cl2NO3, contains two independent mol­ecules. The mol­ecular conformation of each maleamic unit is stabilized by an intra­molecular O—H⋯Ocarbon­yl hydrogen bond owing to the anti disposition of the participating entities. The mean planes through the benzene ring and the amido group are inclined at angles of 45.7 (1) and 40.8 (1)° in the two mol­ecules. In the crystal, the independent mol­ecules self-associate via N—H⋯O hydrogen bonds into zigzag ribbons propagating along the a axis. The ribbons are weakly coupled by C—H⋯π and C—H⋯O inter­actions

3-Chloro-N-(2-methyl­phen­yl)benzamide

In the mol­ecular structure of the title compound, C14H12ClNO, the meta-Cl atom in the benzoyl ring is positioned anti to the C=O bond, while the ortho-methyl group in the aniline ring is positioned syn to the N—H bond. The two benzene rings are nearly coplanar [dihedral angle = 3.48 (5)°]. The crystal structure is stabilized by N—H⋯O hydrogen bonds, which link the mol­ecules into chains along the b axis

4-Chloro-N-(3,5-dimethyl­phen­yl)benzamide

In the mol­ecular structure of the title compound, C15H14ClNO, the amide group forms dihedral angles of 15.8 (2) and 27.2 (2)°, respectively, with the benzoyl and aniline rings, while the angle between the benzoyl and aniline rings is 11.5 (1)°. The crystal structure is stabilized by N—H⋯O hydrogen bonds, which give rise to infinite chains running along the c axis

(7R,8S,8aS)-8-Hydr­oxy-7-phenyl­perhydro­indolizin-3-one

In the title compound, C14H17NO2, the six-membered ring of the indolizine system adopts a chair conformation. In the crystal, mol­ecules form chains parallel to the b axis via inter­molecular O—H⋯O hydrogen bonds. The absolute mol­ecular configuration was assigned from the synthesis

2-Chloro-N-phenyl­acetamide

In the title compound, C8H8ClNO, the conformations of the N—H and C=O bonds are anti to each other, but the C—Cl and C=O bonds in the side chain are syn. The mol­ecules are linked by N—H⋯O hydrogen bonds into infinite chains running in the [101] direction

Phenyl 4-methyl­benzoate

The structure of the title compound, C14H12O2, resembles those of phenyl benzoate and 4-methyl­phenyl benzoate, with similar bond parameters. The two aromatic rings make a dihedral angle of 76.0 (1)°. The plane of the central —C(=O)—O— group is twisted by 9.4 (2)° out of the plane of the benzoyl ring, and by 83.3 (1)° out of the plane of the phenyl ring. The crystal structure exhibits weak parallel stacking of the benzoyl rings, with an inter­planar distance of 3.65 Å and an offset of 1.84 Å. The methyl group shows orientational disorder

N-(3-Chloro­phen­yl)maleamic acid

In the title compound, C10H8ClNO3, the molecular conformation is stabilized by two intra­molecular hydrogen bonds. The first is a short O—H⋯O hydrogen bond within the maleamic acid unit and the second is a C—H⋯O hydrogen bond which connects the amide group with the phenyl ring. The maleamic acid unit is essentially planar, with an r.m.s. deviation of 0.044 Å, and makes a dihedral angle of 15.2 (1)° with the phenyl ring. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into C(7) chains running [010]

N-(2,4,6-Trimethyl­phen­yl)maleamic acid

The mol­ecular structure of the title compound, C13H15NO3, is stabilized by a short intra­molecular O—H⋯O hydrogen bond within the maleamic unit. In the crystal, inter­molecular N—H⋯O hydrogen bonds link mol­ecules into zigzag chains propagating in [010]

N-(3,4-Dimethyl­phen­yl)maleamic acid

The title compound, C12H13NO3, crystallizes with four independent mol­ecules in the asymmetric unit. The N—H bond and the C=O bond in the amide segment are anti to each other. The C=C double bond is cis configured and an intra­molecular O—H⋯O hydrogen bond is formed in each molecule. The mean planes through the aromatic ring and the amide group –NHCO– are inclined at angles of 17.4 (3), 20.8 (2), 16.2 (2) and 11.2 (3)° in the four mol­ecules. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into ribbons along the b axis

N-(2,6-Dichloro­phen­yl)-3-methyl­benzamide

In the mol­ecular structure of the title compound, C14H11Cl2NO, the two aromatic rings form a dihedral angle of 70.9 (1)°. The central amido group –NH—C(=O)– makes a dihedral angle of 26.6 (2)° with the methyl­phenyl ring and 82.5 (1)° with the dichloro­phenyl ring. Inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into chains running along the c axis of the crystal