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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-9 H -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 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—H⋯O 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 π–π stacking inter­actions between the fluorene units [centroid–centroid distance = 3.583 (2) Å].

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