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In the title compound, C23H24N4O5, the essentially planar benzimidazole ring system [maximum deviation = 0.008 (2) Å] forms a dihedral angle of 39.22 (7)° with the attached nitro­benzene ring. The pyrrolidin-2-one ring adopts an envelope conformation with a C atom as the flap. In the crystal, mol­ecules are connected by C—H...O inter­actions, forming sheets propagating in (011). The crystal packing also features weak π–π stacking inter­actions [centroid–centroid = 3.6746 (12) Å].

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In the title compound, C24H27N3O5·H2O, the essentially planar benzimidazole ring system [maximum deviation = 0.020 (1) Å] forms dihedral angles of 54.10 (11) and 67.79 (6)°, respectively, with the mean plane of pyrrolidin-2-one ring and the benzene ring. The pyrrolidin-2-one ring adopts an envelope conformation with one of the methylene C atoms at the flap. An intra­molecular C—H...π inter­action is observed. In the crystal, O—H...O and O—H...N hydrogen bonds link the two components into a double-tape structure along the a axis. The crystal packing is further stabilized by weak π–π stacking [centroid–centroid distance = 3.6632 (9) Å] and C—H...O inter­actions.

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In the title compound, C23H22N4O4, the essentially planar [maximum deviation = 0.022 (1) Å] benzimidazole ring system forms dihedral angles of 86.16 (7) and 37.38 (6)°, respectively, with the imidazole and benzene rings. The dioxolane ring adopts an envelope conformation with the methyl­ene C atom at the flap. In the crystal, C—H...O and C—H...N inter­actions link the mol­ecules into a ribbon along the a axis. The crystal packing is further stabilized by weak π–π stacking inter­actions [centroid–centroid distances = 3.5954 (8) and 3.7134 (8) Å] and C—H...π inter­actions.

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In the title compound, C23H25N3O3, the benzimidazole ring system is essentially planar [maximum deviation = 0.0240 (18) Å]. The mean plane through this ring system forms a dihedral angle of 42.23 (7)° with the benzene ring. The pyrrolidine ring is in an envelope conformation with the flap atom disordered over two sites with occupancies of 0.813 (11) and 0.187 (11). In the crystal, weak C—H...O hydrogen bonds form R22(10) ring motifs, which are connected by further C—H...O inter­actions, forming ribbons along the b axis. The crystal structure is further stabilized by weak π–π inter­actions involving the imidazole and benzene rings of the benzimidazole ring system [centroid–centroid distances = 3.6788 (11) and 3.6316 (10) Å] and weak C—H...π inter­actions.

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The asymmetric unit of the title compound, C24H27N3O4, contains two mol­ecules, A and B. The benzimidazole rings are essentially planar [maximum deviations = 0.0144 (10) and 0.0311 (8) Å in A and B, respectively]. The dihedral angle between the benzimidazole mean plane and its attached benzene ring is 36.90 (5) ° for mol­ecule A and 51.40 (5) ° for mol­ecule B. In both mol­ecules, the pyrrolidine ring adopts an envelope conformation with a C atom as the flap. In molecule B, the flap C atom is disordered over two positions in a 0.711 (6):0.289 (6) ratio. In the crystal, C—H...O inter­actions link the mol­ecules, generating [100] chains. The crystal packing also features weak π–π inter­actions between the imidazole and benzene rings [centroid–centroid distances = 3.8007 (7) and 3.8086 (7) Å] and between the benzene rings [centroid–centroid distance = 3.7001 (7) Å] and C—H...π inter­actions involving the benzene rings.

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In the title compound, C24H25N3O5, the benzimidazole and benzodioxole ring systems are each approximately planar [maximum deviations = 0.043 (1) and 0.036 (1) Å, respectively]. Their mean planes form a dihedral angle of 42.85 (4)°. The pyrrolidine ring has an envelope conformation with one of the methyl­ene C atoms forming the flap. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into a three-dimensional network. The crystal packing is further stabillized by weak π–π inter­actions between the benzene rings within the benzimidazole ring system [centroid–centroid distance = 3.7955 (7) Å]. A weak C—H...π inter­action involving the benzodioxole ring is also present.

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The asymmetric unit of the title compound, C16H14N4O4, contains one half-mol­ecule of (nitro­phen­yl)ethanimine and the complete mol­ecule is generated by a crystallographic inversion centre. The mol­ecule has an E conformation with respect to each C=N double bond. The central C=N—N=C plane is twisted from the benzene rings with a dihedral angle of 24.76 (11)°. In the crystal, C—H...O inter­actions link the molecules to form sheets that lie parallel to (10-4).

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In the title compound, C23H15BrO3, the anthracene ring system is essentially planar [maximum deviation = 0.29 (2) Å] and makes a dihedral angle of 5.74 (8)° with the mean plane of the bromo-substituted benzene ring. An intra­molecular C—H...O hydrogen bond generates an S(9) ring motif. In the crystal, mol­ecules are linked by C—H...O inter­actions, forming a two-dimensional network parallel to the ac plane. π–π stacking inter­actions are observed between benzene rings [centroid–centroid distances = 3.5949 (14) and 3.5960 (13) Å].

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In the title compound, C21H24O3, the enone moiety adopts an s-cis conformation and the dihedral angle between the benzene rings is 12.89 (6)°. The hex­yloxy tail adopts an extended conformation. In the crystal, inversion dimers are linked by pairs of O—H...O hydrogen bonds and pairs of C—H...O inter­actions, forming two R22(7) and one R22(10) loops. The dimers are then arranged into sheets lying parallel to (201) and weak C—H...π inter­actions consolidate the packing.

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In the title compound, C29H40O3, the enone moiety adopts an s-cis conformation. The dihedral angle between the benzene rings is 4.33 (5)° The least-squares mean line through the tetra­decyl side chain forms a dihedral angle of 83.99 (7)° with the normal to the attached benzene ring. In the crystal, O—H...O and C—H...O hydrogen bonds involving the keto and the hy­droxy O atoms form ribbons along [-41-1]. The crystal structure also features C—H...π inter­actions.

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In the title compound, C25H32O3, the enone group adopts an s-cis conformation. The alk­oxy chain is in an all-trans conformation. The dihedral angle between the benzene rings is 7.86 (5)°. In the crystal, mol­ecules are connected by pairs of O—H...O hydrogen bonds, forming inversion dimers and giving R22(10) rings. Within these dimers, weak C—H...O hydrogen bonds form two R22(7) rings. In the crystal, the approximately planar mol­ecules [largest deviation for an atom being 0.4737 (12) Å for the terminal C atom of the alk­oxy chain] are arranged in sheets parallel to (20-1). Weak C—H...π inter­actions are also observed.
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