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There are three independent mol­ecules in the asymmetric unit of the title compound, C9H11NO3, which are connected by O—H...O hydrogen bonds, forming an R33(15) ring. The dihedral angles between the planes of the benzene and amide groups are 75.16 (3), 71.47 (3) and 70.56 (3)°. The hy­droxy O atom lies 0.912 (3), 1.172 (2) and 1.339 (2) Å from the mean plane of the corresponding benzene ring in the three mol­ecules.

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In the title compound, C20H25NO5, the di­hydro­pyridine ring adopts a flattened boat conformation. The meth­oxy­phenyl ring is almost perpendicular to the mean plane of the pyridine ring [dihedral angle = 88.42 (3)°]. The two carbonyl units adopt a synperiplanar conformation with respect to the double bonds in the di­hydro­pyridine ring. In the crystal, mol­ecules are connected by N—H...O hydrogen bonds into R44(24) tetra­meric rings. A region of disordered electron density, located at the center of four adjacent mol­ecules, was treated with the SQUEEZE routine in PLATON [Spek (2009). Acta Cryst. D65, 148–155]. It is probably the result of traces of the solvent of crystallization and was not taken into account during the structure refinement.

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In the title compound, C19H18ClNO3, the non-aromatic part of the fused ring system adopts an envelope conformation with the central methyl­ene C atom as the flap. The dihedral angle between the pyridine and benzene rings is 56.98 (3)°. In the crystal, mol­ecules are linked into double layers parallel to (100) by a network of weak C—H...O inter­actions.

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The title compound, C14H12BrNO4, has two chiral C atoms. The C atom next to the O atom in the di­hydro­furan ring has an S configuration, while the adjacent chiral C atom has an R configuration. The cyclo­hex-2-enone and di­hydro­furan rings both adopt envelope conformations, with the flap atoms (middle CH2 in cyclo­hex-2-enone and NO2-substituted C in di­hydro­furan) lying 0.612 (3) and 0.295 (2) Å, respectively, from the mean plane of the remaining atoms. The dihedral angle between the mean planes of the furan and benzene rings is 80.0 (3)°. In the crystal, the mol­ecules are linked by C—H...O inter­actions, generating a three-dimensional network.

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The title compound, C16H16BrNO4, has two adjacent chiral C atoms and both have an S configuration. The fused cyclo­hex-2-enone and di­hydro­furan rings both adopt envelope conformations, with the quaternary C atom and the nitro-substituted C atoms as the respective flap. The flap atoms lie 0.607 (3) and −0.253 (2) Å, respectively, from the mean plane of the remaining ring atoms on opposite sides. The dihedral angle between the mean plane of the four coplanar atoms of the di­hydro­furan ring and the phenyl ring is 86.16 (3)°. In the crystal, mol­ecules are linked by weak C—H...O inter­actions, forming a ladder motif parallel to the b axis.
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