2-[2-(5-Ethoxy-4-methoxy-2-nitrophenyl)vinyl]-1H-indole

n the title compound, $C_{19}H_{18}N_{2}O_{4}$ the indole moiety is planar and the dihedral angle between it and the substituted phenyl ring is 24.38 (5)degrees. In the solid state, inversion-related molecules are linked to form N-H...O hydrogen-bonded dimers. The molecular packing is stabilized by C-H...pi interaction

A New Synthetic Route to Dihydrobenzopyran Via Tandem Demethylation Cyclisation

A tandem demethylation-cyclisation reaction resulting in the formation of pyran rings using AlCl3/EtSH reagent under mild reaction conditions is reported. X-ray diffraction studies on the intermediate support the suggested mechanism

Supramolecular structures of 2-cyano-3-dimethylamino N-(4-methylphenyl)acrylamide and 2-cyano-3-dimethylamino N-(2-methoxyphenyl)acrylamide

In the title compounds, C13H15N3O, (I), and C13H15N3O2, (II), the dihedral angles between the planes of the phenyl ring and the amide group are 4.1 (1) and 20.7 (1)degrees, respectively. The molecules adopt a fully extended conformation, aided by intramolecular interactions. The molecular structures of (I) and (II) display different crystal packing and hydrogen-bonding networks

8-Chloro-4-[1-(phenylsulfonyl)indol-3-yl]-3a,4,5,9b-tetrahydro-3H-cyclopenta[c]quinoline

In the title compound,$C_{26}H_{21}ClN_{2}O_{2}S$, the tetrahydropyridine ring adopts a sofa conformation and the cyclopentene ring adopts an envelope conformation. In the crystal, centrosymmetrically related molecules exist as N–H...O and C– H...O hydrogen-bonded dimers, and the molecular packing is stabilized by C–$\pi$ and van der Waals interaction

2-(1,3-Dioxoisoindolin-2-yl)acetic acid–N′-[(E)-4-methoxybenzylidene]pyridine-4-carbohydrazide (2/1)

In the crystal structure of the title compound, 2C10H7NO4·C14H13N3O2, the two independent acid molecules are connected through strong O—H...N and O—H...O hydrogen bonds to the central molecule of the antitubercular drug N′-[(E)-4-methoxybenzylidene]pyridine-4-carbohydrazide. Two such trimolecular units related by an inversion centre interact through a pair of N—H...O hydrogen bonds, forming a 3 + 3 molecular aggregate. The dihedral angle between the aromatic rings of the hydrazone molecule is 1.99 (12)°. The crystal packing features weak C—H...O and π–π stacking interactions, with centroid–centroid distances of 3.8460 (19) and 3.8703 (13) Å