2-(4-Isopropyl­benzylidene)propanoic acid

The two mol­ecules in the asymmetric unit of the title compound, C13H16O2, form dimers through O—H⋯O hydrogen bonding, resulting in R 2 2(8) rings. Each carboxyl­ O atom is involved in inter­amolecular C—H⋯O hydrogen bonds, forming five-membered rings. There exist dissimilar dihedral angles within the two mol­ecules, for example the carboxylate and isopropyl groups make dihedral angles of 59.6 (4) and 71.7 (3)° in the two molecules. There are no intermolecular π inter­actions

3-(3,5-Dichloro­anilinocarbon­yl)propionic acid

The crystal structure of the title compound, C10H9Cl2NO3, consists of dimers due to inter­molecular O—H⋯O hydrogen bonding forming an R 2 2(8) ring through the carboxyl­ groups. These dimers are linked to each other by inter­molecular hydrogen bonds between the amine group and the adjacent carbonyl O atom. A single C—Cl⋯π inter­action is also observed between the chloro-substituted aromatic rings

4-[(E)-Phenyl­imino­meth­yl]benzonitrile

In the mol­ecule of the title compound, C14H10N2, the two aromatic rings are oriented at a dihedral angle of 32.22 (6)°. In the crystal structure, inter­molecular C—H⋯N hydrogen bonds link the mol­ecules into centrosymmetric R 2 2(10) dimers. A weak π–π inter­action between the cyanobenzene rings, with a centroid–centroid distance of 3.8447 (3) Å, further stabilizes the crystal structure. There is also a C—H⋯π inter­action between the aniline ring and a CH group of the cyanobenzene ring