organic compounds
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The whole molecule of the title compound, C16H18O4, is generated by twofold rotational symmetry; the twofold axis bisects the central C—C bond. The O—C—C—O torsion angle about the central C—C bond is 69.45 (16)°. Symmetry-related benzene rings are inclined to one another by 64.91 (8)°. In the crystal, molecules are connected by C—HO hydrogen bonds, forming a three-dimensional network.
organic compounds
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In the title compound, C20H25NO5, the dihydropyridine ring adopts a flattened boat conformation. The methoxyphenyl ring is almost perpendicular to the mean plane of the pyridine ring [dihedral angle = 88.42 (3)°]. The two carbonyl units adopt a synperiplanar conformation with respect to the double bonds in the dihydropyridine ring. In the crystal, molecules are connected by N—HO hydrogen bonds into R44(24) tetrameric rings. A region of disordered electron density, located at the center of four adjacent molecules, was treated with the SQUEEZE routine in PLATON [Spek (2009). Acta Cryst. D65, 148–155]. It is probably the result of traces of the solvent of crystallization and was not taken into account during the structure refinement.
organic compounds
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In the title compound, C19H18ClNO3, the non-aromatic part of the fused ring system adopts an envelope conformation with the central methylene C atom as the flap. The dihedral angle between the pyridine and benzene rings is 56.98 (3)°. In the crystal, molecules are linked into double layers parallel to (100) by a network of weak C—HO interactions.
organic compounds
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In the title compound, C16H16O4, the aromatic rings are almost normal to one another, making a dihedral angle of 85.81 (10)°. In the crystal, molecules are linked by C—HO hydrogen bonds, forming chains propagating along the b-axis direction. There are also C—Hπ interactions present which link the chains, forming two-dimensional networks lying parallel to (102).
organic compounds
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The title compound, C4H6ClNO3, crystallizes with two independent molecules (A and B) in the asymmetric unit. In each molecule, there are N—HO and N—HCl hydrogen bonds. Both molecules are relatively planar, with the mean plane of the acetamide [N—C(=O)C] group being inclined to the mean plane of the acetate group [C—C(=O)O] by 9.23 (13)° in molecule A and 6.23 (12)° in molecule B. In the crystal, adjacent molecules are linked by O—HO hydrogen bonds and weak C—HO contacts forming –A–A–A– and –B–B–B– parallel chains propagating along the a-axis direction.