organic compounds
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There are three independent molecules in the asymmetric unit of the title compound, C9H11NO3, which are connected by O—HO 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.
organic compounds
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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—HO interactions, generating a three-dimensional network.
organic compounds
Open access
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—HO interactions, forming a ladder motif parallel to the b axis.