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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.

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In the title compound, C14H19ClN2O, the diazepine ring adopts a boat conformation. The Cl atom of the chloro­acetyl group is trans to the N atom of the diazepine ring. In the crystal, the mol­ecules form chains running along the diagonal of the ac plane through N—H...O hydrogen bonds.

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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.

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In the title compound, C17H19N, the piperidine ring adopts a chair conformation. The phenyl rings substituted at the 2- and 6-positions of the piperidine ring subtend dihedral angles of 81.04 (7) and 81.10 (7)° with the best plane of the piperidine ring. The crystal packing features C—H...π inter­actions.

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In the title compound, C21H24ClNO, the piperidine ring adopts a chair conformation. The two phenyl rings are inclined to one another by 20.7 (1)°, and are inclined to the mean plane of the four planar atoms of the piperidine ring by 87.64 (10) and 70.8 (1)°. The mol­ecular structure features short intra­molecular C—H...Cl and C—H...O contacts. In the crystal, there are no significant inter­molecular inter­actions present.

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In the title compound, C19H23N, the piperidine ring adopts a chair conformation. The phenyl rings at the 2,6-positions of the piperidine ring occupy equatorial orientations. The crystal structure features C—H...π inter­actions.
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