c-3,t-3-Dimethyl-4-oxo-r-2,c-6-diphenyl­piperidine-1-carboxamide

In the title compound, C26H26N2O2, the piperidinone ring adopts a distorted boat conformation. The two phenyl rings substituted at positions 2 and 6 of the piperidinone ring occupy axial and equatorial orientations, which are approximately perpendicular to each other [89.14 (8)°]. The phenyl­carbamoyl group adopts an extended conformation. The crystal structure is stabilized by inter­molecular C—H⋯O inter­actions

c-3,t-3-Dimethyl-r-2,c-6-diphenyl­piperidin-4-one

In the title compound, C19H21NO, the piperidine ring adopts a chair conformation. The two phenyl rings attached to the piperidine ring at 2 and 6 positions occupy equatorial orientations and the dihedral angle between them is 57.53 (11)°. In the crystal, the mol­ecules are connected via weak inter­molecular C—H⋯π inter­actions, leading to a zigzag chains

5-Dichloro­acetyl-4-methyl-2,3,4,5-tetra­hydro-1H-1,5-benzodiazepin-2-one hemihydrate

There are two crystallographically independent organic mol­ecules in the asymmetric unit of the title compound, C12H12Cl2N2O2·0.5H2O. The benzodiazepine ring adopts a distorted boat conformation in both molecules. The crystal packing is controlled by N—H⋯O, C—H⋯O and O—H⋯O intra- and inter­molecular hydrogen bonds. A graph-set motif of R 3 3(14) dimer formation by a combination of N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds stabilizes the mol­ecules and extends along a axis

c-3,t-3-Dimethyl-r-2,c-7-diphenyl-1,4-diazepan-5-one

In the title compound, C19H22N2O, the diazepine ring adopts a distorted chair conformation. One of the N—H groups forms an inter­molecular N—H⋯O hydrogen bond generating an R 2 2(8) graph-set motif. The other N—H group does not form a hydrogen bond

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

In the title compound, C21H23NO2, the piperidine ring adopts a distorted boat conformation. The two phenyl rings form dihedral angles of 64.6 (1) and 87.8 (1)° with the best plane through the piperidine ring. The crystal packing is governed by inter­molecular C—H⋯O inter­actions

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

In the title compound, C20H21NO2, 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 86.0 (1) and 67.3 (1)° with the mean plane of the piperidine ring (all six non-H atoms). The crystal packing features C—H⋯O inter­actions

r-2,c-6-Bis(4-methoxy­phenyl)-c-3,t-3-dimethyl-1-nitro­sopiperidin-4-one

In the title compound, C21H24N2O4, the piperidine ring adopts a distorted boat conformation. The crystal structure is stabilized by C—H⋯π inter­actions involving one of the methoxy­phenyl rings

2,2,4-Trimethyl-5-(4-tolyl­sulfon­yl)-2,3,4,5-tetra­hydro-1H-1,5-benzo­diazepine

In the title compound, C19H24N2O2S, the benzodiazepine ring adopts a distorted boat conformation. The S atom shows a distorted tetra­hedral geometry, with the O—S—O [119.16 (14)°] and N—S—C [107.48 (10)°] angles deviating significantly from ideal values. The crystal packing is controlled by C—H⋯O, N—H⋯O and C—H⋯π inter­actions

t-3-Ethyl-r-2,c-7-bis­(4-methoxy­phen­yl)-1,4-diazepan-5-one

The title compound, C21H26N2O3, crystallizes with two independent mol­ecules in the asymmetric unit. In both independent mol­ecules, the diazepine ring adopts a chair conformation. In the crystal, the independent mol­ecules exist as N—H⋯O hydrogen-bonded R 2 2(8) dimers which are linked via N—H⋯O hydrogen bonds, forming tetra­mers. The tetra­mers are linked by C—H⋯O hydrogen bonds. In one of the molecules in the asymmetric unit, the terminal C atom of the ethyl group is disordered over two positions with refined occupancies of 0.742 (4) and 0.258 (4)