Anil N. Mayekar

1-(quinolin-2-yl)ethanone

The title compound, C11H9NO, crystallizes with four independent molecules in the asymmetric unit. The formyl group in each molecule is coplanar with the attached quinoline ring system. The independent molecules exist as two pseudo-inversion-related pairs. Each set of these molecules forms sheets parallel to the ac plane which are alternately stacked along the b axis. The crystal packing is stabilized by C-H center dot center dot center dot O intermolecular hydrogen-bonding interactions.

(2E)-1-(3-Bromo­phen­yl)-3-(4,5-dimeth­oxy-2-nitro­phen­yl)prop-2-en-1-one

In the title compound, C17H14BrNO5, the dihedral angle between the 3-bromo-substituted benzene ring and the 4,5-dimethoxy-2-nitro-phenyl ring is 15.2 (1)°. The dihedral angles between the mean plane of the propenone group and the mean planes of the 3-bromo-substituted benzene and 4,5-dimethoxy-2-nitrophenyl rings are 6.9 (6) and 20.5 (5)°, respectively. Weak intermolecular C—H⋯O interactions contribute to crystal stability and π–π interactions [centroid–centroid distances = 3.7072 (18) and 3.6326 (18) Å] are also observed.

Ethyl 6-(6-meth­oxy-2-naphth­yl)-2-oxo-4-(2-thien­yl)cyclo­hex-3-ene-1-carboxyl­ate

The title compound, C24H22O4S, was prepared by reaction between (2E)-3-(6-methoxy-2-naphthyl)-1-(2-thienyl)prop-2-en-1-one and ethyl acetoacetate. In the crystal, the cyclohexenone ring shows a distorted half-chair conformation. The length of the double bond in the cyclohexenone ring [1.343 (4) Å] is normal.

8-Bromo-1,3-diphenyl-2,3-dihydro-1H-naphtho­[1,2-e][1,3]oxazine

The title compound, C24H18BrNO, consists of an envelope-configured oxazine ring with a fused 8-bromo-1,3-diphenyl group and two bonded phenyl rings. The dihedral angles between the mean planes of the 8-bromo-1,3-diphenyl and the phenyl rings are 54.5 (6) and 87.4 (8)°, respectively. The oxazine is essentially coplanar with the 8-bromo-1,3-diphenyl [dihedral angle = 9.4 (1)°]. Weak C—H⋯π interactions contribute to the crystal packing.

(E)-1-(4-Methyl­phen­yl)ethanone [8-(trifluoro­meth­yl)quinolin-4-yl]hydrazone

In the title compound, C19H16F3N3, the dihedral angle between the naphthalene and quinoline ring systems is 14.58 (8)°. The hydrazone C—N—N=C—C chain is in an extended conformation and its mean plane is nearly coplanar with the quinoline plane [dihedral angle = 3.45 (9)°]. The bond angles within the phenyl ring show the almost additive influence of the two para substituents. In the crystal, weak π–π [centroid–centroid distances = 3.779 (2) and 3.718 (1) Å] and C—H⋯F directional interactions join the molecules into centrosymmetric dimers, which are further connected into infinite zigzag chains propagating along a.

(2E)-1-(2,5-Dichloro-3-thien­yl)-3-(6-meth­oxy-2-naphth­yl)prop-2-en-1-one

In the title compound, C18H12Cl2O2S, the dihedral angle between the thiophene ring and the naphthalene ring system is 2.13 (4)°. In the crystal, pairs of weak intermolecular C—H⋯O hydrogen bonds form centrosymmetric dimers.

(E)-1-(2,5-Dichloro-3-thien­yl)-3-(3,4-dimeth­oxy­phen­yl)prop-2-en-1-one

In the title compound, C15H12Cl2O3S, the prop-2-en-1-one (enone) fragment is almost planar [C—C—C—O = 2.2 (4)°] and it subtends dihedral angles of 11.9 (2) and 11.0 (2)° with the thiophene and benzene rings, respectively. The dihedral angle between the aromatic rings is 3.47 (16)°. In the crystal, weak C—H⋯O and C—H⋯Cl interactions link the molecules, leading to R 2 2(14), R 2 2(24) and C(11) supramolecular motifs occurring within the three-dimensional network. Weak aromatic π–π stacking [centroid–centroid separations = 3.6823 (15) and 3.8722 (15) Å] may also help to consolidate the packing.

Ethyl 4-(2,4-dichloro­phen­yl)-6-(6-meth­oxy-2-naphth­yl)-2-oxocyclo­hex-3-ene-1-carboxyl­ate

In the title compound, C(26)H(22)Cl(2)O(4), the cyclo-hexenone ring adopts an approximate half-chair conformation, with two C atoms displaced by -0.485 (6) and 0.218 (6) Å from the plane of the other four ring atoms. The dihedral angles between its four almost coplanar [maximum deviation = 0.006 (2) Å] atoms and the benzene and naphthalene ring systems are 59.26 (13) and 79.94 (9)°, respectively. The dihedral angle between the aromatic rings systems is 77.14 (7)°. A short intra-molecular C-H⋯Cl contact generates an S(6) ring. In the crystal, mol-ecules are linked by C-H⋯O and C-H⋯Cl inter-actions to generate a three-dimensional network.

(±)-Ethyl 6-(6-meth-oxy-2-naphth-yl)-4-(4-methyl-phen-yl)-2-oxocyclo-hex-3-ene-1-carboxyl-ate.

In the title compound, C27H26O4, the dihedral angle between the naphthalene ring system and the benzene ring is 73.10 (5)°. In the crystal, a weak C—H⋯O interaction occurs. Two C—H groups of the cyclohexene ring are disordered over two sets of sites in a 0.796 (5):0.204 (5) ratio, which corresponds to partial overlap of the two enantiomeric molecules.

2,3-Dibromo-3-(4-bromo-6-methoxy-2-naphthyl)-1-(4-methoxyphenyl)propan-1-one

In the title compound, C21H17Br3O3, the two aromatic residues are almost coplanar with one another dihedral angle = 9.92 ( 6)degrees]. The two Br atoms at the Csp(3) atoms are in a trans conformation.