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In the title compound, C12H9FN2OS, the thienyl ring is disordered over two positions, with the S atom of the major component [occupancy = 87.08 (16)°] oriented towards the ortho-H atom of the benzene ring. The mol­ecule is nearly planar, the dihedral angle between the thio­phene and benzene rings being 13.0 (2)° in the major component. The azomethine C=N double bond in the mol­ecule is of an E configuration. In the crystal, mol­ecules are linked by pairs of N—H...O hydrogen bonds, forming inversion dimers.

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In the title compound, C12H8F2N2OS, the thienyl ring is disordered over two positions, with the S atom of the major component [occupancy = 75.03 (18)%] oriented away from an ortho-F atom of the benzene ring. The mol­ecule is nearly planar, the dihedral angle between the thio­phene and benzene rings being 6.19 (18) (in the major component) or 3.5 (6)° (in the minor component). The azomethine C=N double-bond in the mol­ecule is of an E configuration. In the crystal, mol­ecules are linked by pairs of N—H...O hydrogen bonds, generating inversion dimers.

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The asymmetric unit in the title thio­urea derivative, C13H19N3S, comprises three independent mol­ecules (A, B and C). The thio­urea groups are superimposable for the three mol­ecules, but there are significant conformational differences. Mol­ecules A and B are approximate mirror images of each other, and mol­ecule C has an inter­mediate conformation. The dihedral angles between the thio­urea groups and the phenyl rings are 52.10 (5), 63.29 (5) and 66.46 (6)° in mol­ecules A, B and C, respectively. Each independent mol­ecule self-associates into a supra­molecular chain along [100] via N—H...S hydrogen bonds. Mol­ecules of A and B assemble into layers four mol­ecules thick in the ac plane via C—H...S and C—H...π inter­actions. Mol­ecules of C self-assemble into layers in the ac plane via C—H...S inter­actions. The layers stack along the b axis with no specific inter­actions between them.

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In the title compound, C26H20N2O4, the central isoindole core is almost planar (r.m.s. deviation = 0.043 Å). The phenyl rings lie to either side of the plane [dihedral angles = 88.64 (5) and 67.74 (6)°] and the dihedral angle between the phenyl rings is 63.39 (7)°. In the crystal, mol­ecules are linked by C—H...O inter­actions; notably, one carbonyl O atom accepts three such bonds.

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The five-membered ring in the title imidazolidinone derivative, C11H12N2O2S, adopts an envelope conformation with the S-bound C atom being the flap atom. Overall, the mol­ecule has a U-shaped conformation as both rings are folded towards each other [dihedral angle = 31.66 (6)°]. An eight-membered amide {...HNCO}2 synthon leads to hydrogen-bonded dimeric aggregates in the crystal: these are additionally linked by C—H...π inter­actions.

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In the title compound, C23H17ClN2O3, the quinazoline fused-ring system, including the ring-bound carbonyl-O and methyl-C atoms, is close to being planar (r.m.s. deviation = 0.044 Å) and is essentially orthogonal to both the 2-tolyl ring [dihedral angle = 89.51 (8)°] and to the ester group [the C—O—C—C torsion angle = −103.69 (16)°]. The carboxyl­ate group is almost coplanar with the benzene ring to which it is attached [O—C—C—C torsion angle = −4.7 (2)°]. The 2-tolyl ring system is disordered over two orientations in a 0.871 (3):0.129 (3) ratio. In the crystal, mol­ecules are consolidated into a three-dimensional architecture by C—H...Cl, C—H...O, C—H...N, C—H...π and π–π inter­actions [inter-centroid distances = 3.6443 (9) and 3.8557 (11) Å].
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