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The asymmetric unit of the title compound, C17H15NO4, contains two independent mol­ecules with similar geometric parameters. In both mol­ecules, the conformation of the cyclo­hexene ring is half-chair, while the pyrrolidinone ring adopts an envelope conformation with the γ-carbon atom of the α-pyrrolidinone ring as the flap. In the crystal, O—H...O hydrogen bonds between the carb­oxylic and carbonyl groups link alternate independent mol­ecules into chains propagating in the b-axis direction. The crystal packing also features weak C—H...π inter­actions.

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The title molecule, C20H23NO7, the product of nucleophilic cleavage of the 3a,6-ep­oxy bridge in 1-oxo-2-phenyl­octa­hydro-3a,6-ep­oxy­iso­indole-7-carboxyl­ate, comprises a cis-fused bicyclic system containing a 2-pyrrolidinone ring in an envelope conformation (with the C atom bearing the carboxyl­ate substituent as the flap) and a cyclo­hexane ring in a chair conformation. The carboxyl­ate substituent occupies the equatorial position, whereas the two acet­yloxy substituents are in axial positions. The N atom has a trigonal-planar geometry, the sum of the bond angles being 359.3 (3)°. The dihedral angle between the mean plane of the four planar atoms of the pyrrolidinone ring and the phenyl ring is 25.98 (6)°. In the crystal, mol­ecules are linked into zigzag chains along the c-axis direction by C—H...O hydrogen bonds.
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