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1.  Crystal structure of N 1-phenyl-N 4-[(quinolin-2-yl)methyl­idene]benzene-1,4-di­amine 
In the title compound, C22H17N3, the dihedral angles between the central benzene ring and the terminal phenyl ring and quinoline ring system (r.m.s. deviation = 0.027 Å) are 44.72 (7) and 9.02 (4)°, respectively, and the bond-angle sum at the amine N atom is 359.9°. In the crystal, the N—H group is not involved in hydrogen bonding and the mol­ecules are linked by weak C—H⋯π inter­actions, generating [010] chains.
doi:10.1107/S1600536814016006
PMCID: PMC4186095  PMID: 25309245
crystal structure; quinoline; C—H⋯π inter­actions
2.  2,2,6,6-Tetra­bromo-3,4,4,5-tetra­meth­oxy­cyclo­hexa­none 
In the title compound, C10H14Br4O5, synthesized from the meth­oxy Schiff base N-(pyridin-2-ylmeth­yl)meth­oxy­aniline and mol­ecular bromine, the cyclo­hexa­none ring has a chair conformation with one of the four meth­oxy groups equatorially orientated with respect to the carbonyl group and the others axially orientated. The C—Br bond lengthsvary from 1.942 (4) to1.964 (4) Å. In the crystal, weak C—H⋯Ocarbon­yl hydrogen-bonding inter­actions generate chains extending along the b-axis direction. Also present in the structure are two short inter­molecular Br⋯Ometh­oxy inter­actions [3.020 (3) and 3.073 (4) Å].
doi:10.1107/S160053681401472X
PMCID: PMC4120536  PMID: 25161601
crystal structure
3.  N 1-[(1H-Imidazol-2-yl)methyl­idene]-N 4-phenyl­benzene-1,4-di­amine 
The title compound, C16H14N4, is non-planar with dihedral angles between the planes of the imidazole and phenyl­enedi­amine rings of 30.66 (4)° and between the planes of the phenyl­enedi­amine and N-phenyl rings of 56.63 (7)°. In the crystal, mol­ecules are connected by N—H⋯N hydrogen bonds, generating a chain extending along the b-axis direction. The crystal structure is also stabilized by C—H⋯π inter­actions between N-phenyl and imidazole rings and slipped π–π stacking inter­actions between imidazole rings [centroid–centroid distance = 3.516 (4) Å] giving an overall two-dimensional layered structure lying parallel to (010).
doi:10.1107/S1600536814014238
PMCID: PMC4120595  PMID: 25161587
crystal structure
4.  6-Hy­droxy­imino-5α-cholestane 
The title compound, C27H47NO, is a steroid derivative composed of a saturated carbon fused-ring framework with an alkyl side chain. Ring bond lengths have normal values with an average of 1.533 (2) Å, while the cholestane side chain shows an average bond length of 1.533 (2) Å. The three cyclohexane rings adopt chair conformations or close to chair conformations while the cyclopentane ring is twisted. The cholesterol side-chain is fully extended with a gauche–trans conformation of the terminal methyl groups. There are eight chiral centres in the molecule; the absolute configuration of these sites was determined from the structure presented. There are two molecules in the asymmetric unit; in one, the alkyl chain is disordered over two sets of sites [occupancy ratios of 0.50:0.50 and 0.67:0.33].
doi:10.1107/S1600536812040093
PMCID: PMC3470390  PMID: 23125803

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