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In the title chiral aldimine, C 19 H 17 N, the azomethine group is not fully conjugated with the phenyl substituent: the dihedral angle between phenyl and C * —N=C mean planes is ϕ 3  = 23.0 (2)°. Compared with the earlier DFT-B3LYP/6–31 G( d ) computations from the literature, the C=N—C * —C(naph­thyl) torsion angle, found at ϕ 2  = −118.0 (2)° in the X-ray structure, does not match the angle calculated for the potential minimum energy at ϕ 2  = 0°. However, this angle is close to the second potential energy minimum at ϕ 2  = −120° which is  ca . 8.5 kJ mol −1  above the global energy minimum. Thus, the reported X-ray structure corresponds to the second most likely (according to DFT) conformer, allowing the existence of other polymorphs to be anti­cipated.

(S)-(+)-N-Benzylidene-1-(1-naphthyl)ethylamine