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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 title mol­ecule, C18H19N3O3, lies on a mirror plane that bis­ects the adamantyl group. In the crystal, C—H...O and C—H...N inter­actions lead to supra­molecular chains along [100]. These assemble into layers in the ab plane via π–π inter­actions [centroid–centroid distance = 3.6548 (7) Å] between the oxadiazole and benzene rings.

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In the title compound, C18H22BrN3OS, the piperidine ring adopts a chair conformation. The mean plane of the thia­zole ring forms dihedral angles of 23.97 (10) and 75.82 (10)° with the mean planes of its adjacent benzene and piperidine rings, respectively. An intra­molecular N—H...N hydrogen bond generates an S(7) ring motif in the mol­ecule. In the crystal, no significant inter­moelcular hydrogen bonds are observed, but a weak π–π inter­action with a centroid–centroid distance of 3.8855 (13) Å occurs.

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The asymmetric unit of the title compound, C13H11BrN2OS, consists of two crystallographically independent mol­ecules (A and B). In each mol­ecule, the pyrrolidine ring adopts an envelope conformation with a methyl­ene C atom as the flap atom. In mol­ecule A, the central thia­zole ring makes a dihedral angle of 36.69 (11)° with the adjacent phenyl ring, whereas the corresponding angle is 36.85 (12)° in mol­ecule B. The pyrrolidine ring is slightly twisted from the thia­zole ring, with C—N—C—N torsion angles of 4.8 (3) and 3.0 (4)° in mol­ecules A and B, respectively. In the crystal, C—H...π and π–π [centroid-to-centroid distance = 3.7539 (14) Å] inter­actions are observed. The crystal studied was a pseudo-merohedral twin with twin law (-100 0-10 101) and a refined component ratio of 0.7188 (5):0.2812 (5).
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