(E)-3-Isopropyl-1-methyl-2,6-di­phenyl­piperidin-4-one O-nicotinoyl oxime

In the title compound, C₂₇H₂₉N₃O₂, the piperidine ring exists in a chair conformation with an equatorial orientation of the phenyl and methyl substituents. The C—C=N bond angles are significantly different [119.1 (2) and 127.2 (2)°]. The phenyl rings are inclined to one another by 44.90 (14)°, and by 80.85 (13) and 79.62 (12)° to the mean plane of the piperidine ring. The terminal pyridine ring is inclined to the piperidine ring mean plane by 74.79 (15)°. In the crystal, mol­ecules are linked by C—H...π inter­actions, forming a three-dimensional network.

(E)-1,3-Dimethyl-2,6-di­phenyl­piperidin-4-one O-(phen­oxy­carbon­yl)oxime

The title piperidine derivative, C₂₆H₂₆N₂O₃, has an E conformation about the N=C bond. The piperidine ring has a chair conformation and its mean plane is almost perpendicular to the attached phenyl rings, making dihedral angles of 87.47 (9) and 87.34 (8)°. The planes of these two phenyl rings are inclined to one another by 60.38 (9)°. The plane of the terminal phenyl ring is tilted at an angle of 32.79 (9)° to the mean plane of the piperidine ring. The mol­ecular conformation is stabilized by two intra­molecular C—H...O contacts. There are no significant inter­molecular inter­actions in the crystal.