(Z)-tert-Butyl 2-(4-amino-9H-fluoren-9-ylidene)acetate
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چکیده
The title compound, C(19)H(19)NO(2), obtained as an almost equimolar mixture (as shown by (1)H NMR) with the E isomer through a Wittig reaction between 4-amino-9H-fluoren-9-one and the stabilized ylide Ph(3)P=CHCO(2)C(CH(3))(3), was obtained pure in the Z configuration following crystallization from toluene. The mol-ecule 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 mol-ecules are linked by N-H⋯O hydrogen bonds, forming cyclic structures with R(4) (4)(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 π-π stacking inter-actions between the fluorene units [centroid-centroid distance = 3.583 (2) Å].
منابع مشابه
N-(Fluoren-9-ylmethoxycarbonyl)-l-aspartic acid 4-tert-butyl ester
The bond distances and bond angles of the title compound, C(23)H(25)NO(6), are consistent with values typically found for fluoren-9-ylmethoxy-carbonyl-protected amino acids. The conformations of the backbone and the side chain are slightly different from those of l-aspartic acid. The crystal structure exhibits two inter-molecular hydrogen bonds, forming a two-dimensional sheet structure paralle...
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