2-[Bis(5-chloro-2-pyridylamino)methyl]pyridine monohydrate

In the title compound, the dihedral angles between the 2-amino-5-chloro­pyridyl rings and the pyridine ring are 56.26 (6)° and 78.83 (5)°; the angle between the 2-amino-5-chloro­pyridyl rings is 72.42 (5)°. The solvent water mol­ecules are linked to the organic compound by N—H⋯O, O—H⋯O, N—H⋯N and O—H⋯N hydrogen bonds. π⋯π Stacking inter­actions are also observed between the 2-amino-5-chloro­pyridyl rings (centroid⋯centroid distance = 3.243 Å)

4-(E)-2-[3-(3-[(E)-2-(4-cyanophenyl)-1-diazenyl]hexahydro-1-pyrimidinylm ethyl)hexahydro-1-pyrimidinyl]-1diazenylbenzonitrile: X-ray crystal structure

Methyl 4-((E)- 2-{3-[(3 - {( E)- 2-[ 4-( methoxycarbonyl) phenyl]- 1-diazenyl}-5, 5-dimethyl hexahydro-1-pyrimidinyl) methyl]- 5, 5-dimethylhexahydro-1- pyrimidinyl}-1-diazenyl) benzoate ( 1) has been synthesized by reaction of a mixture of formaldehyde and 2,2- dimethyl-1,3-propanediamine with p-methoxycarbonylbenzenediazonium chloride. The crystal structure of 1 has been determined by single crystal X-ray diffraction analysis. The crystals of 1 displayed problems of disorder; the asymmetric unit is built up by two independent molecules, which display disorder within a methoxycarbonyl group. The two independent molecules in the asymmetric unit are very similar, differing only slightly about the mutual orientation of the aryltriazenyl groups. With respect to the N-C-N bridge between the hexahydropyrimidinyl rings, the two equivalent fragments containing the triazene moieties are in a cis orientation. The N-N single bonds, in the range 1.319( 4) - 1.348( 4) &ANGS;, and the N=N double bonds, in the range 1.255( 5) - 1.275( 4) &ANGS;, indicate significant conjugations within the triazene moieties. All the hexahydropyrimidine six-membered rings adopt a chair conformation as shown by their puckering parameters. The crystal packing is determined only by simple van der Waals interactions. The crystal structure of 1 is compared with the previously reported structure of the unbranched hexahydropyrimidine analogue 2

An X-Ray Crystallographic Study of the Novel Aminal bis-(p-Ethoxycarbonylphenylamino-)methane

The crystal structure of bis-(p-Ethoxycarbonylphenylamino-methane (1) has been determined by single crystal X-ray diffraction analysis. The bis-aminal (1) molecule is V-shaped and situated on a twofold axis passing through C1 with the phenyl rings forming a dihedral angle of 70.2(1). The carboxylate and phenyl groups are coplanar. The crystal structure of 1 is compared with the structure of the closely related aminals, 2–5. Crystal data: 1 C19H22N2O4, tetragonal, space group I41cd (N.110), a = 20.4760(7) A ˚ ´,b = 20.4760(7) A ˚ ´,c = 8.2984(3) A ˚ , and V = 3477.7(2) A ˚ 3, for Z = 8