disorder in main residue; R factor = 0.038; wR factor = 0.113; data-to-parameter ratio = 15.4. The structure of the title compound, C16H13NO2, was determined as a part of a project on the synthesis of new compounds which can make two-photon absorptions. In the crystal structure, both aldehyde groups are located within the carbazole plane. One of these groups is disordered and was refined using a split model with site-occupation factors for each position of 0.5. Related literature For the synthesis of 9-ethyicarbazole, see: Li et al. (2001)
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