2,3,6,7-Tetramethoxy-9,10-anthraquinone
نویسندگان
چکیده
Mol-ecules of the title compound, C(18)H(16)O(6), are almost planar [maximum deviation = 0.096 (4) Å] and reside on crystallographic centres of inversion. They adopt a conformation in which the C(meth-yl)-O bonds are directed along the mol-ecular short axis [C-C-O-C torsion angles of -175.3 (3) and 178.2 (3)°]. In the crystal, mol-ecules adopt a slipped-parallel arrangement with π-π stacking inter-actions along the a axis with an inter-planar distance of 3.392 (4) Å. Weak C-H⋯O inter-actions link the mol-ecules into sheets parallel to (10-2).
منابع مشابه
Tetramethyl anthracene-2,3,6,7-tetracarboxylate–tetramethyl 9,10-dihydro-9,10-dioxoanthracene-2,3,6,7-tetracarboxylate (1/1)1
In the title co-crystal, C(22)H(16)O(10)·C(22)H(18)O(8), the independent tetra-methyl 9,10-dihydro-9,10-dioxoanthracene-2,3,6,7-tetra-carboxyl-ate, (I), and tetra-methyl anthracene-2,3,6,7-tetra-carboxyl-ate, (II), components occupy separate crystallographic inversion centers. In (II), the dihedral angles between the mean aromatic plane and the two independent carboxyl-ate planes are 41.32 (10)...
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In an attempt to brominate 1,4-diprop-oxy-9,10-anthra-quinone, a mixture of products, including the title compound, C14H7BrO4, was obtained. The mol-ecule is essentially planar (r.m.s. deviation = 0.029 Å) and two intra-molecular O-H⋯O hydrogen bonds occur. In the crystal, the mol-ecules are linked by weak C-H⋯O hydrogen bonds, Br⋯O contacts [3.240 (5) Å], and π-π stacking inter-actions [shorte...
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Three diplatinum(II) complexes [{PtL}2(μ-thea)] (H4thea = 2,3,6,7-tetrahydroxy-9,10-dimethyl-9,10-dihydro-9,10-ethanoanthracene) have been prepared, with diphosphine or bipyridyl "L" co-ligands. One-electron oxidation of these complexes gave radical cations containing a mixed-valent [thea·](3-) ligand with discrete catecholate and semiquinonate centers separated by quaternary methylene spacers....
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1-Hy-droxy-4-prop-yloxy-9,10-anthra-quinone, C17H14O4, (I), and its acetyl derivative, 4-acet-yloxy-4-prop-yloxy-9,10-anthra-quinone, C19H16O5, (II), were synthesized from the commercially available dye quinizarin. In both compounds, the anthra-quinone frameworks are close to planarity. There is a large difference in the conformation of the prop-yloxy group; the mol-ecule of (I) adopts a gauche...
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The asymmetric unit of the title compound, C18H16O4, contains two crystallographically independent mol-ecules. The anthra-quinone ring systems are slightly bent with dihedral angles of 2.33 (8) and 13.31 (9)° between the two terminal benzene rings. In the crystal, the two independent mol-ecules adopt slipped-parallel π-overlap with an average inter-planar distance of 3.45 Å, forming a dimer; th...
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عنوان ژورنال:
دوره 68 شماره
صفحات -
تاریخ انتشار 2012