1-Dichloro­acetyl-t-3,t-5-dimethyl-r-2,c-6-diphenyl­piperidin-4-one

In the title compound, C₂₁H₂₁Cl₂NO₂, the piperidine ring adopts a distorted boat conformation. The phenyl rings substituted at the 2- and 6-positions of the piperidine ring subtend angles of 87.9 (7) and 70.8 (9)°, respectively, with the best plane through the piperidine ring. In the crystal, mol­ecules are connected by C—H...O and C—H...Cl inter­actions into layers in the ab plane.

1-(2,2-Di­chloro­acet­yl)-3-ethyl-2,6-di­phenyl­piperidin-4-one

The asymmetric unit of the title compound, C₂₁H₂₁Cl₂NO₂, contains two independent mol­ecules that show similar geometrical features. The piperidine ring adopts a distorted boat conformation. The phenyl rings substituted at the 2- and 6-positions of the piperidine ring are oriented at angles of 65.4 (1) [64.7 (2)°] and 89.2 (1)° [86.3 (2)°] with respect to the least-squares plane of the piperidine ring. In the crystal, adjacent mol­ecules are linked by a network of C—H...O inter­actions, forming a C(6) chain along the c-axis direction.

1-Di­chloro­acetyl-t-3-isopropyl-r-2,c-6-di­phenyl­piperidin-4-one

In the title compound, C₂₂H₂₃Cl₂NO₂, the piperidine ring adopts a twist-boat conformation. The phenyl rings substituted at the 2- and 6-positions of the piperidine ring subtend dihedral angles of 60.6 (2) and 84.2 (1)°, respectively, with the mean plane of the piperidine ring. In the crystal, mol­ecules are linked by C—H...O inter­actions into zigzag chains running along the c-axis direction.