organic compounds
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In the title compound, C20H21NO5, the dihedral angle between the mean planes through the two rings is 47.1 (8)°. The enoate group assumes an extended conformation. The hydroxyethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane being 0.061 (1) Å for the O atom. In the crystal, molecules are linked into cyclic centrosymmetric dimers with an R22(6) motif via pairs of O—HN hydrogen bonds. Intermolecular C—HO hydrogen bonds form a C(8) chain along the b axis. The crystal packing is further stabilized by C—Hπ interactions.
organic compounds
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In the title compound, C19H19NO4, the dihedral angle between the mean planes through the benzene rings is 82.18 (7)°. The C=N double bond is trans-configured. The molecules are linked into centrosymmetric dimers via pairs of O—HN hydrogen bonds with the motif R22(6). The crystal packing also features C—HO interactions. The methyl group attached to one of the aromatic rings is disordered over two almost equally occupied positions [occpancy ratio = 0.51 (4):0.49 (4)].
organic compounds
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In the title compound, C20H16O4S, the thiophene ring makes dihedral angles of 72.9 (2) and 60.5 (2)°, respectively, with the dimethoxy benzene and phenyl rings. In the crystal, C—HO hydrogen bonds link the molecules into a C(9) chain along the b axis. The S and C atoms of the thiophene ring are disordered over two sets of sites [site occupancies = 0.675 (3) and 0.325 (3)]. A short intermolecular SO contact [3.084 (2) Å] is observed in the crystal structure, which also features C—Hπ interactions.
organic compounds
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In the title compound, C25H25N3O4, the central pyrrolidine ring and the two pyrrolidine rings adopt twisted conformations, whereas the piperidine ring in the octahydroindolizine fused ring system adopts a chair conformation. The indoline ring systems are almost perpendicular with respect to the mean plane of the octahydroindolizine ring system, making dihedral angles of 84.4 (5) and 79.4 (5)°. The acetate group attached to the octahydroindolizine ring system assumes an extended conformation. In the crystal, N—HO hydrogen bonds result in the formation of a helical C(7) chain running parallel to [101]. The crystal packing features C—HO hydrogen bonds and C—Hπ interactions.
organic compounds
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In the title compound, C22H21N3O4, the central pyrrolidine ring adopts an envelope conformation with the N atom in the flap position. The indoline ring systems are almost perpendicular to the mean plane of the pyrrolidine ring, making dihedral angles of 86.4 (8) and 83.1 (8)°. The acetate group attached to the pyrrolidine ring assumes an extended conformation. In thecrystal, N—HO hydrogen bonds result in the formation of a C(7) chain running along [100]. The crystal packing also features π–π interactions [centroid–centroid distance = 3.2032 (11) Å].
organic compounds
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In the title compound, C24H16O2, the naphthalene ring system makes dihedral angles of 78.5 (6) and 65.5 (7)° with the terminal and central benzene rings, respectively. The dihedral angle between the benzene rings is 74.5 (8)°. In the crystal, neighbouring molecules are interlinked through two C—Hπ interactions, which construct a two-dimensional supramolecular framework extending infinitely along (010).
organic compounds
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In the title compound, C22H21N3O4, the central pyrrolidine ring adopts a C-envelope conformation with a C atom 0.6593 (13) Å displaced from the mean plane formed by the remaining ring atoms. The indoline ring systems (r.m.s. devisations of 0.0356 and 0.0547 Å) are almost perpendicular to the mean plane of the pyrrolidine ring, making dihedral angles of 89.7 (6) and 82.5 (6)°. The acetate group attached to the pyrrolidine ring assumes an extended conformation. In the crystal,N—HO and C—HO hydrogen bonds connect adjacent molecules, forming an infinite tape extending along [1-1-1]. The crystal packing is further consolidated by strong π–π interactions with a centroid–centroid distance of 3.2585 (8) Å. The title compound is a polymorph of previously reported monoclinic structure [Ganesh et al. (2012). Acta Cryst. E68, o2902–o2903].