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In the title compound, C27H21NO, the piperidine ring adopts a chair conformation. The mean plane through the piperidine ring makes dihedral angles of 49.27 (5) and 63.07 (5)° with the naphthalene ring systems. In the crystal, mol­ecules are linked into dimers via pairs of inter­molecular C—H...O inter­actions, generating ten-membered R22(10) ring motifs. C—H...π inter­actions further stabilize the crystal structure.

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In the title compound, C29H34N2O2, the central piperidine ring adopts a half-chair conformation, whereas the terminal one adopts a chair conformation. The mean plane of the central piperidine ring [maximum deviation = 0.384 (2) Å] makes dihedral angles of 64.82 (13) and 17.55 (13)° with the benzene rings. In the crystal, mol­ecules are linked into a tape along the b axis via C—H...O inter­actions, generating R22(20) and R21(6) graph-set motifs. C—H...π inter­actions are observed between the tapes.
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