Experimental Crystal data

R factor = 0.051; wR factor = 0.125; data-to-parameter ratio = 21.2. 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 R2 2(10) ring motifs. C—H interactions further stabilize the crystal structure. Related literature For the biological activities of ,-unsaturated ketones, see: Lee et al. (1971); Anke et al. (1981); Khodair et al. (1997); Murakami et al. (2002); El-Subbagh et al. (2000); El-Barbary et al. (1994); Dimmock et al. (1983). For ring conformations, see: Cremer & Pople (1975). For bond-length data, see: Allen et al. (1987). For a related structure, see: Basiri et al. (2011). For hydrogen-bond motifs, see: Bernstein et al. (1995). For experimental preparation, see: Das et al. (2007). For the stability of the temperature controller used for data collection