Acta Cryst. (2008). E64, o2156  [ doi:10.1107/S1600536808033850 ]

2,2,9-Trimethyl-2,3-dihydropyrano[2,3-a]carbazol-4-(11H)-one

M. Sridharan, K. J. R. Prasad and M. Zeller

Abstract: The title compound, C₁₈H₁₇NO₂, was prepared from 1-hydroxy-7-methylcarbazole and 3,3-dimethylacrylic acid with trifluoroacetic acid as the cyclization catalyst. The molecules contain an essentially planar 6-methylindole unit. The second aromatic ring is significantly bent away from the plane of this unit, with maximum deviations of 0.171 (1) and 0.185 (1) Å for two of the C atoms. In the crystal structure, there are neither N-HO hydrogen bonds nor - stacking between the aromatic sections of neighboring molecules. There is only one weak C-HO hydrogen bond and a number of weak C-H interactions.

Online 22 October 2008

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