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Mol­ecules of the title compound, C18H16O6, are almost planar [maximum deviation = 0.096 (4) Å] and reside on crystallographic centres of inversion. They adopt a conformation in which the Cmeth­yl—O bonds are directed along the mol­ecular short axis [C—C—O—C torsion angles of −175.3 (3) and 178.2 (3)°]. In the crystal, mol­ecules adopt a slipped-parallel arrangement with π–π stacking inter­actions along the a axis with an inter­planar distance of 3.392 (4) Å. Weak C—H...O inter­actions link the mol­ecules into sheets parallel to (10\overline{2}).

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The title compound, C16H12O4, crystallizes with two half-mol­ecules in the asymmetric unit, each of which is completed by a crystallographic inversion center. The two crystallographically independent mol­ecules have almost the same geometry and are almost planar [maximum deviations = 0.018 (3) and 0.049 (3) Å]. They adopt a conformation in which the Cmeth­yl—O bonds are directed along the mol­ecular short axis [C—C—O—C torsion angles of 179.6 (2) and 178.0 (2)°]. In the crystal, the mol­ecular packing is characterized by a combination of a columnar stacking and a herringbone-like arrangement. The mol­ecules form slipped π-stacks along the b axis, in which there are two kinds of columns differing from each other in their slippage. The inter­planar distances between neighboring mol­ecules are 3.493 (3) for one column and 3.451 (2) Å for the other.
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