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Ethyl 1-oxo-1,2,3,4-tetrahydro-9H-carbazole-3-carboxylate
(Int Union Crystallography, 2009) Hokelek, Tuncer; Dal, Hakan; Tercan, Baris; Gocmenturk, Mustafa; Ergun, Yavuz
The title compound, C15H15NO3, contains a carbazole skeleton with an ethoxycarbonyl group at the 3 position. In the indole ring system, the benzene and pyrrole rings are nearly coplanar, forming a dihedral angle of 1.95 (8)degrees. The cyclohexenone ring has an envelope conformation. In the crystal structure, pairs of strong N-H center dot center dot center dot O hydrogen bonds link the molecules into centrosymmetric dimers with R-2(2)(10) ring motifs. pi-pi contacts between parallel pyrrole rings [centroid-centroid distance = 3.776 (2)angstrom] may further stabilize the structure. A weak C-H center dot center dot center dot O interaction is also observed.
Ethyl 4-oxo-2,3,4,9-tetrahydro-1H-carbazole-3-carboxylate
(Int Union Crystallography, 2011) Gundogdu, Cevher; Gocmenturk, Mustafa; Ergun, Yavuz; Tercan, Baris; Hokelek, Tuncer
In the title compound, C15H15NO3, the carbazole skeleton includes an ethoxycarbonyl group at the 3-position. In the indole ring system, the benzene and pyrrole rings are nearly coplanar, forming a dihedral angle of 0.89 (4)degrees. The cyclohexenone ring has an envelope conformation. In the crystal, intermolecular N-H...O and C-H...O hydrogen bonds link the molecules into a three dimensional network. A weak C-H...pi interaction is also observed.