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In the title compound, C17H18O5, the dihedral angle between the benzene rings is 31.23 (16)°. In the crystal, the mol­ecules are packed in an anti­parallel fashion in layers along the a axis. In each layer, very weak C—H...O hydrogen bonds occur between the meth­oxy and methyl ester groups. Weak C—H...π inter­actions between the 4′- and 5′-meth­oxy groups and neighbouring benzene rings [meth­oxy-C–ring centroid distances = 4.075 and 3.486 Å, respectively] connect the layers.

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In the title compound, C16H16O4, the dihedral angle between the benzene rings is 28.9 (2)°. In the crystal, mol­ecules are packed in layers parallel to the b axis in which they are connected via weak inter­molecular C—H...O contacts. Face-to-face π–π inter­actions also exist between the benzene rings of adjacent mol­ecules, with centroid–centroid and plane-to-plane shift distances of 3.8597 (14) and 1.843 (2) Å, respectively.

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The title compound, C15H16O2, crystallizes with three independent mol­ecules in the asymmetric unit. The intra­molecular torsion angle between the aromatic rings of each mol­ecule are −36.4 (3), 41.3 (3) and −37.8 (3)°. In the crystal, the complicated packing of the mol­ecules forms wave-like layers along the b and c axes. The mol­ecules are connected via extensive meth­oxy–phenyl C—H...π inter­actions. A weak C—H...O hydrogen-bonding network also exists between meth­oxy O atoms and aromatic or meth­oxy H atoms.

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In the title compound, C16H18O3, the dihedral angle between the benzene rings is 33.4 (2)°. In the crystal, mol­ecules are packed in a zigzag arrangement along the b-axis and are inter­connected via weak C—H...O hydrogen bonds, and C—H...π inter­actions involving the meth­oxy groups and the benzene rings of neighbouring molecules.
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