2-(3,4-Di­meth­oxy­phen­yl)-4-(thio­phen-2-yl)-2,3-di­hydro-1,5-benzo­thia­zepine

In the title compound, C₂₁H₁₉NO₂S₂, the seven-membered thia­zepine ring adopts a slightly distorted twist boat conformation. The dihedral angle between the benzene rings is 67.4 (2)°. The mean plane of the thio­phene ring is twisted by 59.3 (2) and 87.7 (2)° from the mean planes of the benezene rings. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds generate R₂²(20) loops.

4-(Thio­phen-2-yl)-2-[4-(tri­fluoro­meth­yl)phen­yl]-2,3-di­hydro-1,5-benzo­thia­zepine

In the title compound, C₂₀H₁₄F₃NS₂, the seven-membered thia­zepine ring adopts a slightly distorted twist–boat conformation. The mean plane of the five-membered thio­phene ring fused to the thia­zepine ring is twisted by 32.3 (3) and 55.6 (4)° from the benzene and phenyl rings, respectively. In the crystal, inversion dimers linked by pairs of weak C—H...N inter­actions are observed.

Crystal structure of (E)-N-phenyl-N′-[1-(thio­phen-2-yl)ethyl­idene]formo­hydrazide

In the title compound, C₁₃H₁₂N₂OS, the planes of the thio­phene and phenyl rings are nearly perpendicular to each other, making a dihedral angle of 86.42 (12)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming a helical chain along the b-axis direction.