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1.  (E)-3-(4-Chloro­phen­yl)-1-(2,3,4-trichloro­phen­yl)prop-2-en-1-one 
In the title chalcone derivative, C15H8Cl4O, the C=C double bond exists in an E configuration and the dihedral angle between the two benzene rings is 48.13 (11)°. In the crystal, mol­ecules are arranged into columns and stacked down the a axis featuring possible weak aromatic π–π stacking inter­actions [centroid–centroid separation = 3.888 (2) Å].
doi:10.1107/S1600536810053213
PMCID: PMC3051492  PMID: 21522935
2.  1-{1-[2,8-Bis(trifluoro­meth­yl)-4-quin­olyl]-5-methyl-1H-1,2,3-triazol-4-yl}ethanone 
There are two independent mol­ecules in the asymmetric unit of the title compound, C16H10F6N4O. The triazole ring is not coplanar with the quinoline ring system; the dihedral angle between the two planes being 74.47 (12) and 63.97 (13)° in the two mol­ecules. The crystal structure is characterized by inter­molecular C—H⋯F, C—H⋯N and C—H⋯O hydrogen bonding. Weak intra­molecular C—H⋯F inter­actions are observed. Disorder is observed in two F atoms of one of the trifluoro­methyl groups of one independent mol­ecule [occupancy ratios 0.77 (3):0.23 (3) and 0.77 (4):0.23 (4)] and in all three F atoms of one of the trifluoro­methyl groups of the second independent mol­ecule [occupancy ratios 0.520 (14):0.480 (14), 0.615 (17):0.385 (17) and 0.783 (11):0.217 (11)]. The O atom is also disordered over two positions with occupancies of 0.60 (13) and 0.40 (13) in the first mol­ecule.
doi:10.1107/S1600536810034926
PMCID: PMC2983247  PMID: 21587507
3.  4-Meth­oxy­benzaldehyde (5-bromo­pyrimidin-2-yl)hydrazone monohydrate 
In the title Schiff base compound, C12H11BrN4O·H2O, the organic mol­ecule exists in an E configuration with respect to the C=N double bond. The pyrimidine ring is approximately planar, with a maximum deviation of 0.011 (2) Å, and forms a dihedral angle of 10.68 (8)° with the benzene ring. In the crystal, inter­molecular O—H⋯N, N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a two-dimensional network parallel to the ac plane.
doi:10.1107/S1600536810033283
PMCID: PMC3007892  PMID: 21588785
4.  4-[4-Eth­oxy­carbonyl-5-(3,4-methyl­ene­dioxy­phen­yl)-3-oxocyclo­hex-1-en-1-yl]-3-phenyl­sydnone 
In the title compound {systematic name: 4-[4-eth­oxy­carbonyl-5-(3,4-methyl­ene­dioxy­phen­yl)-3-oxocyclo­hex-1-en-1-yl]-3-phenyl-1,2,3-oxadiazol-3-ium-5-olate}, C24H20N2O7, the cyclo­hexene and dioxole rings adopt envelope conformations. The sydnone ring and the attached phenyl ring form a dihedral angle of 79.0 (1)°. In the mol­ecular structure, a C—H⋯O hydrogen bond generates an S(6) ring and a C—H⋯π inter­action involving the phenyl ring is observed. In the crystal structure, mol­ecules are linked into a ribbon-like structure along the a axis by C—H⋯O hydrogen bonds.
doi:10.1107/S1600536810033106
PMCID: PMC3008016  PMID: 21588708

Results 1-4 (4)