title: 3-(9H-Carbazol-9-yl)-2H-chromen-2-one.
abstract: The title compound, C(21)H(13)NO(2), was prepared as an example of a new synthesis of carbazoles from a cyclic dibenzo-iodo-lium salt via a twofold Pd-catalysed aryl-ation of a primary amine. The two essentially planar π-subsystems [maximum deviations from the mean square plane of 0.038 (2) Å in the carbazole and 0.059 (2) Å in the coumarine unit] open a dihedral angle of 63.05 (4)°. Two mol-ecules form a centrosymmetrical pair connected via π-π inter-actions between the pyrrole and pyrone rings [centroid-centroid distance = 3.882 (1) Å] and one benzene of the carbazole and the pyrone unit [centroid-centroid distance 3.824 (1) Å]. The lattice is stabilized by C-H⋯O bridging to both coumarin O atoms.
authors: University Mainz, Duesbergweg 10-14, 55099 Mainz,  Germany.
authors: Julien
authors: J
authors: Letessier
authors: Dieter
authors: D
authors: Schollmeyer
authors: Heiner
authors: H
authors: Detert