4-[4-(4-Chloro-1,2,5-thia­diazol-3-yl)phen­yl]morpholine

The crystal and mol­ecular structure of 4-[4-(4-chloro-1,2,5-thia­diazol-3-yl)phen­yl]morpholine are reported.

Propyl 4-amino­benzoate

The title compound C₁₀H₁₃NO₂ was synthesized through a Fischer esterification. The crystal structure complements the physical and spectroscopic data collected as part of a guided inquiry undergraduate Organic Chemistry laboratory experiment.

1-(2,2-Di­phenyl­ethen-1-yl)tropylium perchlorate

In the title salt, two hydrogen bonds from the tropylium moiety and the vinyl group connect the cation with oxygen atoms of the perchlorate anion. The perchlorate anion is surrounded by three tropylium cations. The tropylium rings of the cations, which are related via a C₂ axis, are mostly parallel with a short distance between the centroids.

20-Oxa­penta­cyclo­[15.2.1.0^2,16.0^3,8.0^10,15]icosa-2(16),3,5,7,10(15),11,13,18-octaen-9-one

The mol­ecules of the title compound, C₁₉H₁₂O₂, adopt a saddle shape with almost planar o-xylylene fragments. The carbonyl group and the ether oxygen atom are located on the same side of the carbon skeleton. The mol­ecules are arranged in strands with alternating directions.

N-(3,5-Di­chloro-4-meth­oxy­phen­yl)acetamide

The title compound crystallizes as a two-component twin in space group P1 with Z′ = 6, exhibiting packing-driven conformational multiplicity and N—H⋯O hydrogen-bonded chains propagating along [110].

2-[(2-Methyl­phen­yl)amino]­quinoline-3-carb­oxy­lic acid

In the title compound,the dihedral angle between the quinoline ring system and the pendant phenyl ring is 6.19 (6)° and an intra­molecular N—H⋯O hydrogen bond supports the near-planar conformation. In the extended structure, the mol­ecules associate to form centrosymmetric carb­oxy­lic acid dimers linked by pairs of O—H⋯O hydrogen bonds.

2-[(2,5-Di­methyl­phen­yl)amino]­quinoline-3-carb­oxy­lic acid

The title compound was synthesized using a Buchwald–Hartwig cross-coupling reaction followed by hydrolysis. Single crystals were obtained by slow evaporation of an ethanol solution of it at room temperature. In the crystal, adjacent mol­ecules form carb­oxy­lic acid dimers via inter­molecular hydrogen bonding.

(E)-4-Chloro-2-[(4-hy­droxy-3-meth­oxy­benzyl­idene)amino]­phenol

The title compound was obtained from the reaction of 2-amino-4-chloro phenol with vanillin (4-hy­droxy-3-meth­oxy­benzaldehyde). It crystallizes with two independent and conformationally different mol­ecules in the asymmetric unit.