(E)-3-(2-Chloro­phen­yl)-1-(2,4-dichloro­phen­yl)prop-2-en-1-one

In the title chalcone derivative, C15H9Cl3O, the dihedral angle between the 2-chloro­phenyl and 2,4-dichloro­phenyl rings is 41.79 (14)°. Weak C—H⋯O and C—H⋯Cl intra­molecular inter­actions involving the enone unit generate S(5) ring motifs. In the crystal structure, the mol­ecules are arranged in a head-to-tail manner along the a axis. These chains are stacked along the b axis

2-Bromo-1-(4-methyl­phen­yl)-3-phenyl­prop-2-en-1-one. Corrigendum

Corrigendum to Acta Cryst. (2008), E64, o1559

(E)-1-(2-Thien­yl)-3-(2,4,5-trimethoxy­phen­yl)prop-2-en-1-one

In the title mol­ecule, C16H16O4S, the enone fragment, thio­phene ring and benzene ring are individually essentially planar. The thio­phene ring is disordered over two sites, corresponding to a rotation of approximately 180° about the single C—C bond to which it is attached. The approximate ratio of occupancies for the major and minor components is 0.872 (2):0.128 (2). The major component of the thio­phene ring and the benzene ring are twisted from each other by 13.92 (19)°. An intra­molecular C—H⋯O hydrogen bond generates an S(5)S(5) ring motif. The crystal structure is stabilized by inter­molecular C—H⋯O hydrogen-bonding inter­actions. In addition, a π–π stacking inter­action, with a centroid–centroid distance of 3.852 (2) Å, and short S⋯O [2.9378 (12) Å] and O⋯O [2.5811 (16) Å] contacts are observed

(E)-3-(2-Chloro­phen­yl)-1-(3-methoxy­phen­yl)prop-2-en-1-one

The title compound, C16H13ClO2, adopts an E configuration with respect to the double bond of the propenone unit. The two benzene rings are twisted slightly from each other, making a dihedral angle of 7.14 (5)°. The mol­ecules are arranged in stacks, in which adjacent mol­ecules are related by inversion symmetry and form π–π inter­actions with a centroid–centroid distance of 3.7098 (6) Å. C—H⋯O and C—H⋯π inter­actions are formed between neighbouring mol­ecules

(E)-3-(4-Chloro­phen­yl)-1-(2-fur­yl)prop-2-en-1-one

In the title mol­ecule, C13H9ClO2, the benzene and furyl rings are slightly twisted from each other with a dihedral angle of 5.1 (1)°. An intra­molecular C—H⋯O hydrogen-bond inter­action generates an S(5) ring motif. In the crystal structure, mol­ecules are stacked along the b axis and the crystal packing is stabilized by weak inter­molecular C—H⋯O hydrogen bonds

(E)-3-(4-Chloro­phen­yl)-1-(2-thien­yl)prop-2-en-1-one

The title compound, C13H9ClOS, adopts an E configuration with respect to the C=C double bond of the propenone unit. The thienyl and benzene rings are slightly twisted from each other, making a dihedral angle of 6.38 (3)°. An intra­molecular C—H⋯O hydrogen bond generates an S(5) ring motif. A weak inter­molecular C—H⋯O inter­action, a short intra­molecular S⋯O contact [2.932 (2) Å] and two π–π inter­actions between the thienyl and benzene rings are observed. The centroid–centroid distances of the π–π inter­actions are 3.7899 (16) and 3.7891 (16) Å

(E)-3-(3,4-Dimethoxy­phen­yl)-1-(2-fur­yl)prop-2-en-1-one

In the title mol­ecule, C15H14O4, the benzene and furyl rings are inclined to each other with a dihedral angle of 41.5 (1)°. An intra­molecular C—H⋯O hydrogen-bond inter­action generates an S(5) ring motif. In the crystal structure, mol­ecules are stacked along the b axis and the crystal packing is stabilized by inter­molecular C—H⋯O and C—H⋯π inter­actions. In addition, π–π stacking inter­actions with a centroid-to-centroid distance of 3.5855 (11) Å are observed

Melitracenium chloride

In the title compound [systematic name: 3-(10,10-dimethyl­anthracen-9-yl­idene)-N,N,N-trimethyl­propanaminium chlor­ide], C21H26N+·Cl−, the cyclo­hexane ring adopts a chair conformation. The dihedral angle between the terminal benzene rings is 40.43 (12)°. In the crystal, ions are linked through inter­molecular N—H⋯Cl and C—H⋯Cl hydrogen bonds, forming supra­molecular layers parallel to the bc plane

4-[(E)-2,6-Dichloro­benzyl­ideneamino]-3-{1-[4-(2-methyl­prop­yl)phen­yl]eth­yl}-1H-1,2,4-triazole-5(4H)-thione

In the title Schiff base compound, C21H22Cl2N4S, the triazole ring makes dihedral angles of 2.15 (11) and 87.48 (11)° with the 2,6-dichloro­phenyl and methyl­propyl­phenyl rings, respectively. Weak intra­molecular C—H⋯S and C—H⋯Cl inter­actions generate S(6) and S(5) ring motifs, respectively. In the crystal structure, centrosymmetrically related mol­ecules are linked into dimers by N—H⋯S hydrogen bonds. These dimers are arranged into sheets parallel to the ab plane and are stacked along the c axis. C—H⋯π inter­actions involving the methyl­propyl­phenyl ring and π–π inter­actions involving the dichloro­phenyl ring [centroid–centroid distance = 3.5865 (3) Å] are also observed

3,3-Dimethyl-2-benzofuran-1(3H)-one

In the title compound, C10H10O2, all the non-H atoms except the methyl C atoms lie on a crystallographic mirror plane. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into zigzag chains running parallel to [100]. Weak π–π stacking inter­actions between the benzene rings [centroid–centroid distance = 3.9817 (5) Å] link the chains in the [010] direction