3-[Bis(dimethyl­amino)­methyl­ene]-1,1-diphenyl­urea

In the title compound, C₁₈H₂₂N₄O, the C=N and C—N bond lengths in the CN₃ unit are 1.3179 (11), 1.3551 (11) and 1.3737 (11) Å, indicating double- and single-bond character, respectively. The N—C—N angles are 115.91 (8), 118.20 (8) and 125.69 (8), showing a deviation of the CN₃ plane from an ideal trigonal–planar geometry. The bonds between the N atoms and the terminal C-methyl groups all have values close to a typical single bond [1.4529 (12)–1.4624 (12) Å]. The dihedral angle between the phenyl rings is 79.63 (4)°. In the crystal, the mol­ecules are connected via weak C—H...O hydrogen bonds, generating chains along [100].

4-Morpholine­carboxamidine

In the crystal structure of the title compound, C₅H₁₁N₃O, the C=N and C—N bond lengths in the CN₃ unit are 1.2971 (14), 1.3595 (14) (NH₂) and 1.3902 (13) Å, indicating double- and single-bond character, respectively. The N—C—N angles are 115.49 (9)°, 119.68 (10)° and 124.83 (10)°, showing a deviation of the CN₃ plane from an ideal trigonal–planar geometry. The morpholine ring is in a chair conformation. In the crystal, the mol­ecules are linked by N—H...N and N—H...O hydrogen bonds, generating a three-dimensional network.

Piperidine-1-carboximidamide

In the title compound, C₆H₁₃N₃, the C=N and C—N bond lengths in the CN₃ unit are 1.3090 (17), and 1.3640 (17) (C–NH₂) and 1.3773 (16) Å, indicating double- and single-bond character, respectively. The N—C—N angles are 116.82 (12), 119.08 (11) and 124.09 (11)°, showing a deviation of the CN₃ plane from an ideal trigonal–planar geometry. The piperidine ring is in a chair conformation. In the crystal, mol­ecules are linked by N—H...N hydrogen bonds, forming a two-dimensional network along the ac plane.