5-Bromo-2-chloro­pyrimidin-4-amine

In the title compound, C₄H₃BrClN₃, the pyrimidine ring is essentially planar (r.m.s. deviation from the plane = 0.087 Å). In the crystal, pairs of N—H...N hydrogen bonds connect the mol­ecules into inversion dimers; these are connected by further N—H...N hydrogen bonds into a two-dimensional framework parallel to the bc plane.

Ethyl 2-(quinolin-8-yl­oxy)acetate monohydrate

In the title compound, C₁₃H₁₃NO₃·H₂O, the dihedral angle between the ethyl ester group [C—C—O—C(=O); maximum deviation = 0.003 (2) Å] and the quinoline ring system is 7.94 (12)°. The water solvent mol­ecule is linked to the title mol­ecule via O—H...O and O—H...N hydrogen bonds. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming chains propagating along [100].

(R)-2-Cyano-N-(1-phenyl­eth­yl)acetamide

In the title compound, C₁₁H₁₂N₂O, the dihedral angle between the acetamide group and the benzene ring is 68.7 (1)°. In the crystal, N—H...O and weak C—H...O hydrogen bonds link the mol­ecules into chains along the a-axis direction.

(4-Hy­droxy-3-methyl­phen­yl)(phen­yl)methanone

In the title compound, C₁₄H₁₂O₂, the benzene rings make a dihedral angle of 58.84 (12)°. In the crystal, mol­ecules are linked into chains along the b-axis direction by O—H...O hydrogen bonds. These chains are further linked by C—H...O hydrogen bonds, forming layers parallel to the bc plane.

(4-Hy­droxy-3,5-di­methyl­phen­yl)(phen­yl)methanone

In the mol­ecule of the title compound, C₁₅H₁₄O₂, the dihedral angle between the benzene and phenyl rings is 61.27 (8)°. In the crystal, O—H...O and weak C—H...O hydrogen bonds link the mol­ecules into chains extending along the c-axis direction.