Acta Cryst. (2008). E64, o1978  [ doi:10.1107/S1600536808029735 ]

(Z)-tert-Butyl 2-(4-amino-9H-fluoren-9-ylidene)acetate

M. Krokidis, D. Papaioannou and V. Nastopoulos

Abstract: The title compound, C₁₉H₁₉NO₂, obtained as an almost equimolar mixture (as shown by ¹H NMR) with the E isomer through a Wittig reaction between 4-amino-9H-fluoren-9-one and the stabilized ylide Ph₃P=CHCO₂C(CH₃)₃, was obtained pure in the Z configuration following crystallization from toluene. The molecule shows a planar arrangement of the ring system and the new double bond, whereas the carbonyl O atom forms a 45.1 (3)° dihedral angle with it. The molecules are linked by N-HO hydrogen bonds, forming cyclic structures with R₄⁴(24) graph-set motifs. These motifs are connected to each other, giving rise to a sheet structure parallel to the ab plane. The linkage within the sheets is further enhanced by - stacking interactions between the fluorene units [centroid-centroid distance = 3.583 (2) Å].

Online 20 September 2008

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