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The title ketal, C12H14FNO3, crystallized with two independent molecules in the asymmetric unit. In each molecule the fused ring system is essentially planar [maximum deviations of 0.0169 (11) and 0.0402 (13) Å]. The mol­ecules are each hydrogen bonded across a center of inversion into a dimer; adjacent dimers are linked by another N—H...O hydrogen bond, forming a chain running along [100].

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In the title compound, C14H15NO, the torsion angle about the two Csp3 atoms adopts a partially eclipsed conformation [−61.5 (1)°]. The dihedral angle between the two rings is 48.1 (1)°. In the crystal, the mol­ecules are connected by O—H...N and N—H...O hydrogen bonds into zigzag chains running along [010]. One of the amino H atoms is not involved in hydrogen bonding.

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The dihedral angle between the two phenyl rings in the title compound, C15H17NO, is 52.9 (1)°. In the crystal, the mol­ecules are connected by O—H...N hydrogen bonds into centrosymmetric dimers. The amino H atom is not involved in hydrogen bonding.

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In the title compound, C6H10N2O2·H2O, the imidazole ring is essentially planar, with a maximum deviation of 0.012 (2) Å. In the crystal, mol­ecules are connected via N—H...O and O—H...O hydrogen bonds, forming a supra­molecular tape along the a axis.

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In the title compound, C26H21N3O3S, the quinazolinyl group is essentially planar [r.m.s. deviation for the 10 non-H atoms = 0.057 Å]. The isoindoline-1,3-dione group is linked by an SCH2CH2 chain to the pyrimidinyl C atom that lies between the two N atoms. Also, the phenyl group is linked by a CH2CH2 chain at the N atom adjacent to the carbonyl group. This results in a conformation with these substituents lying to either side of the central quinazolinyl unit, with the former being approximately parallel [dihedral angle = 4.93 (7)°], and the phenyl group being inclined [dihedral angle = 71.61 (9)°] to the central quinazolinyl fused-ring system. In the crystal, mol­ecules are consolidated into a three-dimensional architecture by C—H...O inter­actions, involving all three carbonyl-O atoms, and π–π inter­actions occurring between the pyrimidinyl and isoindole-benzene rings [inter-centroid distance = 3.5330 (13) Å].
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