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PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C21H20N2O3, the lactone ring adopts an envelope conformation with the quaternary C atom bonded to two other C atoms as the flap. The fused pyrrolidine ring adopts a twisted conformation about the Cq-N (q = quaternary) bond. In the crystal, inversion dimers linked by pairs of N-HO hydrogen bonds generate R 2 (2)(8) loops. The dimers are linked into [110] chains by pairs of C-HO inter-actions, which generate R 2 (2)(14) loops.


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C19H18FNO3S, the five-membered oxazolidine ring adopts an envelope conformation with the methine C atom of the fused bond as the flap. Its mean plane is oriented at a dihedral angle of 50.38(1) with respect to the fluoro-phenyl ring. The six-membered thio-pyran ring has a half-chair conformation and its mean plane is almost coplanar with the fused benzene ring, making a dihedral angle of 4.94(10). The two aromatic rings are inclined to one another by 85.96(11), and the mean planes of the oxazolidine and thio-pyran rings are inclined to one another by 57.64(12). In the crystal, mol-ecules are linked by C-H inter-actions, forming a three-dimensional structure.


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C22H23NO2S, the inner pyrrolidine ring (A) adopts an envelope conformation with the methine C atom opposite the fused C-N bond as the flap. The thio-pyran ring (C) has a half-chair conformation and its mean plane is inclined to the fused benzene ring by 1.74(11), and by 60.52(11) to the mean plane of pyrrolidine ring A. In the outer pyrrolidine ring (B), the C atom opposite the fused C-N bond is disordered [site-occupancy ratio = 0.427(13):0.573(13)] and both rings have envelope conformations, with the disordered C atom as the flap. The planes of the phenyl ring and the benzene ring of the thio-chromane unit are inclined to one another by 65.52(14). In the crystal, mol-ecules are linked by a pair of C-HO hydrogen bonds forming inversion dimers.


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C12H11NO4, the dihedral angle between the indole ring system (r.m.s. deviation = 0.019) and the oxirane ring is 88.8(2). The oxirane O atom and the bridging ester O atom are in an approximate syn conformation [O-C-C-O = -25.4(3)] In the crystal, inversion dimers linked by pair of C-HO hydrogen bonds generate R 2 (2)(8) loops, where the C-H donor group forms part of the oxirane ring. A second C-HO inter-action arising from one of the C-H groups of the benzene ring links the dimers into [001] double chains.


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

The title compound, C22H22N2O5, contains two conformationally similar mol-ecules (A and B) in its the asymmetric unit (r.m.s. overlay fit for the 29 non-H atoms = 0.194). In each mol-ecule, the lactone ring has an envelope conformation with the spiro C atom as the flap. In the crystal, A+A and B+B inversion dimers linked by pairs of N-HO hydrgen bonds occur; in both cases, R 2 (2)(8) loops are generated. A weak C-HO inter-action is also observed, which links the dimers into [010] chains.


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C23H20N2O4S2, the central pyrrolidine ring adopts an envelope conformation with the spiro C atom, shared with the benzo-thio-phene ring system, as the flap. The thia-zole ring has a twisted conformation on the S-C bond, where the C atom is that closest to methine C atom. The mean planes of the benzo-thio-phene and indoline ring systems are inclined to the mean plane of the central pyrrolidine ring by 82.75(8) and 80.03(8), respectively, and to each other by 61.49(6). In the crystal, mol-ecules are linked via pairs of N-HO hydrogen bonds, forming inversion dimers with an R 2 (2)(8) ring motif. The dimers are linked via C-HO and C-HN hydrogen bonds, forming a three-dimensional structure. The eth-oxy-carbonyl group is disordered over two orientations, with an occupancy ratio of 0.717(12):0.283(12).


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C27H24N2O3, the dihedral angle between the mean planes of the di-hydro-furan and 3,4-di-hydro-quinoline ring systems is 70.65(9). The di-hydro-furan ring adopts an envelope conformation with the C atom adjacent to the methyl-ene C atom of the pyrrolidine ring as the flap. The five-membered pyrrolidine ring adopts a twist conformation on the N-C(tetra-substituted) bond. In the crystal, mol-ecules are linked via pairs of N-HO hydrogen bonds, forming inversion dimers with an R 2 (2)(8) ring motif. The dimers are linked via pairs of C-HO hydrogen bonds, forming ribbons enclosing R 2 (2)(12) ring motifs lying in a plane parallel to (01-1).


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

The title compound, C12H11NO3, is essentially planar, with the mean plane of the acetate side chain [-C-C(=O)-O-C] being inclined to the mean plane of the indole ring system by 12.49(7). The five- and six-membered rings of the indole group are almost coplanar, making a dihedral angle of 1.76(8). The conformation about the C=C bond is E and there is an intra-molecular C-HO hydrogen bond present. In the crystal, mol-ecules are linked by pairs of C-HO hydrogen bonds forming inversion dimers, with an R 2 (2)(16) ring motif. The dimers are linked by a second pair of C-HO hydrogen bonds, enclosing R 2 (2)(16) ring motifs, forming ribbons lying parallel to (-114). The ribbons are linked via C-H inter-actions, forming a three-dimensional structure.


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and University of Madras
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C23H22N2O4S, the pyrrolidine ring has an envelope conformation with the spiro C atom, shared with the indoline ring system, as the flap. The mean planes of the benzo-thio-phene and indoline ring systems are inclined to the mean plane of the pyrrolidine ring by 88.81(8) and 79.48(8), respectively, and to each other by 68.12(5). In the crystal, mol-ecules are linked via C-HO hydrogen bonds, forming chains propagating along [001].


PubMed | Presidency College at Chennai, Queen Marys College Autonomous and CSIR - Central Leather Research Institute
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C31H22N4O4, the pyrrolidine ring adopts a twist conformation on the N-CH2 bond. The indolin-2-one and the 1H-indole rings are nearly planar (r.m.s. deviations = 0.06 and 0.011, respectively) and are inclined to one another by 34.19(9). The chromene ring system is also nearly planar (r.m.s. deviation = 0.029). It is almost normal to the 1H-indole ring system, with a dihedral angle of 88.71(8), and is inclined to the indolin-2-one ring system by 72.76(8). In the crystal, mol-ecules are linked via N-HO hydrogen bonds, forming slabs parallel to (10-1). The slabs are linked by C-HO hydrogen bonds, forming a three-dimensional structure.

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