Abstract
Molecules of 13H-dibenzo[a,i]fluoren-13-one, C21H12O, straddle a crystallographic mirror plane and are essentially planar, with a dihedral angle of only 1.9 (1)° between the two naphthalene ring systems. Repulsive intramolecular C=O⋯H interactions therefore do not explain the larger distortions found in isomeric ketones.
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