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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—H...O hydrogen bonds, forming a three-dimensional network.

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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—H...O 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.

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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—H...O inter­actions.

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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—H...O hydrogen bonds, forming chains propagating along the b-axis direction. There are also C—H...π inter­actions present which link the chains, forming two-dimensional networks lying parallel to (102).

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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—H...O and N—H...Cl 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—H...O hydrogen bonds and weak C—H...O contacts forming –AAA– and –BBB– parallel chains propagating along the a-axis direction.
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