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In the title compound, C27H24N2O3, the pyrroldine ring adopts a twist conformation, while the six-membered pyranone ring of the coumarin ring system is in a sofa conformation. In the crystal, pairs of N—HO hydrogen bonds link the molecules into inversion R22(8) dimers. These dimers are further connected via C—HO hydrogen bonds.
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In the title compound, C18H15NO2, the dihedral angle between the two benzene rings is 74.8 (1)°. The carbonitrile chain is almost linear, the C—C—N angle being 176.2 (2)°. In the crystal, π–π interactions [centroid–centroid distance = 3.842 (1) Å] are observed.
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In the title compound, C24H19ClN2O3S, the sulfonyl-bound benzene ring forms dihedral angles of 38.1 (2) and 81.2 (1)°, respectively, with the formyl benzene and benzene rings. The molecular conformation is stabilized by a weak intramolecular C—HO hydrogen bond, which generates an S(5) ring motif. The crystal packing is stabilized by C—HO hydrogen bonds, which generate C(7) zigzag chains along [010] and R33(19) ring motifs along [010]. The crystal packing is further stabilized by C—Clπ interactions [Clcentroid = 3.456 (2) Å and C—Clcentroid = 173.4 (2)°].
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The C=C bond in the title compound, C15H15NO4S, has a Z configuration. The thiazolidine ring is essentially planar [maximum deviation = 0.008 (1) Å for the N atom] and is oriented at a dihedral angle of 59.1 (1)° with respect to the benzene ring. In the crystal, pairs of C—HO hydrogen bonds link centrosymmetrically related molecules into dimers, generating R22(18) ring motifs. The crystal packing is further stabilized by C—Hπ and C—Oπ [Ocentroid = 3.412 (2) Å and C—Ocentroid = 115.0 (1)°] interactions.
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The title compound, C19H18O5, crystallizes with two independent molecules (A and B) in an asymmetric unit in both of which the two aromatic rings are in a bisectional orientation as evidenced by the dihedral angle between them [41.7 (1)° in molecule A and 35.6 (1)° in molecule B]. Both molecules adopt an E configuration with respect to the C=C bond. An intramolecular C—HO hydrogen-bond occurs in molecule A. The crystal packing features intermolecular C—HO interactions.
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In the title compound, C22H23N3O4, the tolyl ring is almost perpendicular [83.86 (7)°] to the best plane through the eight atoms of the pyrrolizidine ring system. The molecular conformation is stabilized by an intramolecular O—HO hydrogen bond. The crystal packing features inversion dimers with R22(8) motifs linked by pairs of N—HO hydrogen bonds.
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In the title compound, C24H20N2O2, the six-membered pyran ring adopts a half-chair conformation with one C atom deviating from the mean plane of the remaining ring atoms by 0.654 (6) Å. The five-membered isoxazole ring adopts an N-envelope conformation with the N atom displaced by 0.742 (5) Å from the mean plane formed by the remaining ring atoms. The carbonitrile side chain is almost linear, with a C—C—N angle of 178.6 (5)°. The crystal packing is stabilized by intermolecular C—HN interactions, through bifurcated acceptor hydrogen bonds formed between the carbonitrile N atom and two alternate C atoms in the unsubstituted benzene ring. The molecular structure and crystal packing are further stabilized by intramolecular and intermolecular C—Hπ interactions.
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In the title compound, C14H13NO4S, the thiazolidine ring is essentially planar [maximum deviation = 0.010 (2) Å for the carbonyl C atom between the N and S atoms] and is oriented at a dihedral angle of 60.1 (1)° with respect to the benzene ring. In the crystal, molecules are linked into zigzag chains running along the c axis by C—HO hydrogen bonds. The crystal packing is further stabilized by C—Hπ interactions involving the benzene ring.
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In the title compound, C29H25NO5S, the sulfonyl-bound benzene ring forms dihedral angles of 42.1 (1) and 48.5 (1)°, respectively, with the formyl-substituted benzene ring and the naphthalene residue. In the crystal, pairs of C—HO interactions lead to the formation of R22(10) inversion dimers, which are linked by further C—HO interactions into supramolecular tapes running along [100]. The crystal packing is further stabilized by C—Hπ interactions.
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In the title compound, C25H25NO5S, the O atom of the hydroxy group is disordered over two positions, with occupancies of 0.820 (2) and 0.180 (2). The sulfonyl-bound benzene ring forms dihedral angles of 31.8 (1) and 60.7 (1)°, respectively, with the hydroxymethylbenzene and phenyl rings. The molecular conformation is stabilized by an intramolecular O—HO hydrogen bond, generating an S(8) ring motif. The crystal packing is stabilized by intermolecular C—HO hydrogen bonds and C—Hπ interactions.
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In the title compound, C18H16N2O2, the dihedral angle between the mean planes through the two benzene rings is 56.8 (6)°. 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 0.047 (1) Å for the hydroxyimino O atom. In the crystal, the molecules are linked into cyclic centrosymmetric dimers with R22(6) motifs via O—HN hydrogen bonds.
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In the title compound, C19H17BrO4, the dihedral angle between the two benzene rings is 82.9 (2)°. The molecular structure is stabilized by an intramolecular C—HO hydrogen bond, which generates an S(7) ring motif. The crystal packing is stabilized by C—HO hydrogen bonds, which generate two centrosymmetic ring systems with R22(18) and R22(14) graph-set motifs. The crystal packing is further stabilized by intermolecular π–π interactions [centroid–centroid distance = 3.984 (2) Å].
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In the title compound, C18H16O2, the heterocyclic ring of the chroman-2-one system adopts a slightly distorted screw-boat conformation. The dihedral angle between the least-squares planes of the coumarin ring system and the benzene ring is 67.5 (1)°. The crystal packing features C—HO hydrogen bonds, which link the molecules into centrosymmetric R22(8) dimers, and C—Hπ interactions.
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In the title compound, C17H12ClNO2, the dihedral angle between the two benzene rings is 42.9 (1)°. There are no sgnificant intermolecular interactions.
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In the title compound, C14H9O2S, the benzothiazole unit is oriented at a dihedral angle of 7.1 (1)° with respect to the benzodioxole unit. The dioxole ring adopts flattened envelope conformation with the methylene C atom at the flap. The crystal packing is stabilized by π–π interactions [centroid–centroid distances = 3.705 (1) and 3.752 (1) Å], C—Hπ interactions and a short SS contact of 3.485 (1) Å.
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The title compound, C14H13NO3S, (I), is a second monoclinic polymorph. The original polymorph, (II), was reported by Mahía et al. [Acta Cryst. (1999), C55, 2158–2160]. Polymorph (II) crystalllized in the space group P21/c (Z = 4), whereas the title polymorph (I) occurs in the space group P21/n (Z = 4). The dihedral angle between the two aromatic rings is 75.9 (1)° in (I) compared to 81.9 (1)° for (II). In both polymorphs, two S(6) rings are generated by intramolecular N—HO and C—HO hydrogen bonds, resulting in similar molecular geometries. However, the two polymorphs differ concerning their crystal packing. In (I), molecules are linked into C(8) zigzag chains along the b axis by C—HO hydrogen bonds, whereas in (II) molecules are linked by C—HO hydrogen bonds, forming C(7) chains along the b axis. The title polymorph is further stabilized by intermolecular C—Hπ and π–π interactions [centroid–centroid distance = 3.814 (1) Å]. These interactions are not evident in polymorph (II).
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In the title compound, C25H22N2O3S, the sulfonyl-bound benzene ring forms dihedral angles of 36.8 (2) and 81.4 (2)°, respectively, with the formylbenzene and methylbenzene rings. The molecular conformation is stabilized by an intramolecular C—HO hydrogen bond, which generates an S(5) ring motif. The crystal packing is stabilized by C—HO hydrogen bonds, which generate C(11) chains along the b axis. The crystal packing is further stabilized by π–π interactions [centroid–centroid distance = 3.927 (2) Å].
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In the title compound, C21H19NO6, the isoindole ring system is essentially planar [maximum deviation = 0.019 (2) Å for the N atom] and is oriented at a dihedral angle of 51.3 (1)° with respect to the benzene ring. The two methoxy groups are almost coplanar with the attached benzene ring [C—O—C—C = 3.7 (4) and 4.3 (4)°]. The molecular conformation is stabilized by an intramolecular C—HO hydrogen bond, which generates an S(9) ring motif. In the crystal, molecules are linked through bifurcated C—H(O,O) hydrogen bonds having R12(5) ring motifs, forming chains along the b-axis direction. The crystal packing is further stabilzed by π–π interactions [centriod–centroid distance = 3.463 (1) Å].
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In the title compound, C18H18O2, the methyl acrylate substituent adopts an extended E conformation with all torsion angles close to 180°. The mean plane of the acrylate unit and the phenyl ring are approximately orthogonal to each other, making a dihedral angle of 81.40 (6)°. The position of the carbonyl group with respect to the olefinic double bond is typically S-trans. The crystal packing is stabilized by intermolecular C—Hπ interactions.
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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.
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In the title compound, C31H26O6, the five-membered ring of the indane unit adopts a slight envelope conformation with the flap atom displaced by 1.38 (14) Å. The molecular conformation is stabilized by an intramolecular C—HO hydrogen bond, which generates an S(9) ring motif. In the crystal, pairs of C—HO hydrogen bonds link centrosymmetrically related molecules into dimers, generating R22(22) ring motifs. The crystal packing is further stabilized by C—Hπ interactions.
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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)].
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The title compound, C25H22N2O3, with three stereogenic centres, crystallizes in a centrosymmetric space group as a racemate. The pyran ring adopts a sofa conformation and the five-membered isoxazole ring exhibits an envelope conformation. The dihedral angle between the benzene ring and the mean plane through the near coplanar atoms of the pyran ring is 10.54 (9)°. In the crystal, no significant intermolecular interactions are observed.
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The asymmetric unit of the title compound, C19H20N2O3, contains two independent molecules in both of which the pyrrolidine ring adopts an envelope conformation, but with a C atom as the flap in one molecule and the N atom in the other. The pyran ring adopts a half-chair conformation in both molecules. In the crystal, molecules are linked via C—HO hydrogen bonds and C—Hπ interactions.
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The title compound, C17H15NO5, adopts an E conformation with respect to the C=C double bond of the phenylacrylate unit. The phenyl ring and methyl acrylate group of the phenylacrylate unit are disordered over two sets of sites with site-occupancy ratios of 0.705 (5):0.295 (5) and 0.683 (3):0.317 (3), respectively. The mean plane through the benzene ring of the phenyl acrylate makes dihedral angles of 88.4 (8) (major component) and 86.7 (8)° (minor component) with the nitrophenoxy ring; the dihedral angle between the two components is 3.64 (6)°. Intramolecular C—HO interactions stabilise the molecular structure. In the crystal, C—HO interactions result in a chain of molecules running along the b axis.
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The title compound, C25H23NO5, comprising two stereogenic carbon atoms of the same configuration, crystallizes in a centrosymmetric space group as a racemate. The six-membered pyran ring and the five-membered isoxazole ring adopt sofa and twisted conformations, respectively. The dihedral angle between the benzene ring and the mean plane through the near coplanar atoms of the pyran ring is 10.73 (7)°. The crystal structure features C—HO hydrogen bonds.
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In the title compound, C17H15NO2S, the seven-membered thiazepine ring adopts a distorted twist-boat conformation. The dihedral angle between the mean planes of the benzothiazepin ring system and the attached benzene ring is 47.7 (1)°. In the crystal, pairs of N—HO hydrogen bonds link inversion-related molecules into dimers, generating R22(8) ring motifs. These dimers are further connected into a chain along the a axis by C—HO hydrogen bonds, resulting in R22(14) ring motifs. The crystal packing also features C—Hπ interactions.
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In the title compound, C16H12ClNOS, the seven-membered thiazepine ring adopts a distorted twisted boat conformation. The dihedral angle between the least-squares planes of the 1,5-benzothiazepine ring system and the benzene ring is 50.2 (1)°. In the crystal, pairs of N—HO hydrogen bonds link centrosymmetrically related molecules into dimers, generating R22(8) ring motifs. The crystal packing is further stabilized by π–π interactions [centroid–centroid distance = 3.763 (2) Å].
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In the title compound, C17H14O4, the C=C bond adopts an E conformation and the dihedral angle between the benzene rings is 73.9 (1)°. The crystal packing features C—HO hydrogen bonds, which generate C(4) chains propagating along the b-axis direction. Weak aromatic π–π stacking interactions [centroid–centroid distance = 3.703 (1) Å] are also observed.
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Molecules of the title compound, C21H24O4, are located on a twofold rotation axis running through the central methylene C atom. The aldehyde group is coplanar with the benzene ring [C-C-C-O = 175.7 (4) °].
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In the title compound, C19H15NO4, the isoindole ring system is essentially planar [maximum deviation = 0.011 (1) Å] and is oriented at a dihedral angle of 75.7 (1)° with respect to the phenyl ring. The molecular conformation is stabilized by an intramolecular C—HO hydrogen bond. The crystal packing is stabilized by C—HO hydrogen bonds, which generate zigzag chains along the a axis. The crystal packing is further stabilized by a C—Hπ interaction.
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The C=C double bonds in the title compound, C28H27NO4, adopt an E conformation. In the crystal, pairs of C—HO hydrogen bonds link the molecules into inversion dimers.
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In the crystal structure of the title compound, C16H12ClNOS, the molecules are linked into centrosymmetric R22(8) dimers via pairs of N—HO hydrogen bonds. The seven-membered ring adopts a boat conformation.
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In the crystal structure of the title compound, C16H13NOS, molecules are linked into cyclic centrosymmetric R22(8) dimers via pairs of N—HO hydrogen bonds. The seven-membered ring adopts a boat conformation.
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In the title compound, C13H8N2O2S, the essentially planar benzothiazole system [maximum deviation = −0.012 (1) Å for the S atom] is oriented at a dihedral angle of 48.3 (1)° with respect to the benzene ring. The nitro group is substantially twisted from the plane of its attached benzene ring [dihedral angle = 52.0 (1)°]. The crystal packing features C—HO hydrogen bonds, which generate C(6) helical chains propagating along [010]. Weak C—Hπ interactions also occur in the crystal.
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In the title compound, C11H11NO2, the mean planes formed by the benzene ring and the C and N atoms of the acryl group are almost orthogonal to each other, with a dihedral angle of 85.7 (1)°. During the structure analysis, it was observed that the unit cell contains large accessible voids, with a volume of 186.9 Å3, which may host disordered solvent molecules. This affects the diffraction pattern, mostly at low scattering angles. Density identified in these solvent-accessible areas was calculated and corrected for using the SQUEEZE routine in PLATON [Spek (2009), Acta Cryst. D65, 148–155]. Despite the presence of the hydroxy group in the molecule, no classical or nonclassical hydrogen bonds are observed in the structure. This may reflect the fact that the O—H group points towards the solvent-accessible void.
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In the title compound, C25H20N2O5S, the benzodioxole ring system is essentially planar [maximum deviation = 0.021 (2) Å] and forms dihedral angles of 85.2 (1) and 74.2 (1)°, respectively, with the formyl benzene and sulfonyl-bound benzene rings. In the crystal, C—HO hydrogen bonds generate C(8) chains along [100] and R33(19) ring motifs. In addition, a weak π–π interaction [centroid–centroid distance = 3.937 (3) Å] is also observed.
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In the title compound, C12H8N2O6, the 1,3-benzodioxole ring system is essentially planar [maximum deviation = 0.036 (2) Å] and the nitro group is oriented at a dihedral angle of 15.4 (1)° with respect to its mean plane. In the crystal, moleucles are linked into C(8) [101] chains by C—HO hydrogen bonds, and weak aromatic π–π stacking [centroid–centroid distance = 3.887 (1) Å] also occurs.