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

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)

3-Isopropyl-2,6-bis(4-methoxyphenyl)piperidin-4-one

In the title compound, C22H27NO3, the piperidine ring adopts a slightly distorted chair conformation. The dihedral angle between the two aromatic rings is 60.4 (1)°. In the crystal, the amino group forms a rather long N—H...O contact to a methoxy O atom. There are also C—H...O interactions present