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2-Ethyl-8-methoxy-methyl-4-oxo-4H-chromen-7-yl (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo-[2.2.1]heptane-1-carboxyl-ate.

ABSTRACT: The title compound C(23)H(26)O(7), was prepared by esterification of 2-ethyl-7-hydr-oxy-8-methoxy-methyl-4H-chromen-4-one with (S)-(-)-camphanic chloride. The two rings of the chromone system are coplanar, making a dihedral angle of 1.99?(19)°, and the camphanoyl unit substituted at 7-O retains the original bicyclo-[2.2.1]heptane conformation of the starting reagent.

SUBMITTER: Qiu Y

PROVIDER: S-EPMC2979559 | biostudies-literature | 2010 May

REPOSITORIES: biostudies-literature

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2-Ethyl-8-methoxy-methyl-4-oxo-4H-chromen-7-yl (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo-[2.2.1]heptane-1-carboxyl-ate.

Qiu Ya Y Chen Ying Y Xia Peng P

Acta crystallographica. Section E, Structure reports online 20100526 Pt 6

The title compound C(23)H(26)O(7), was prepared by esterification of 2-ethyl-7-hydr-oxy-8-methoxy-methyl-4H-chromen-4-one with (S)-(-)-camphanic chloride. The two rings of the chromone system are coplanar, making a dihedral angle of 1.99 (19)°, and the camphanoyl unit substituted at 7-O retains the original bicyclo-[2.2.1]heptane conformation of the starting reagent. ...[more]

PMID: 21579527

Similar Datasets

(1S*,2R*,3S*,4R*,5R*)-5-Tetra-decyloxy-methyl-7-oxabicyclo-[2.2.1]heptane-2,3-dicarb-oxy-lic anhydride.

Project description:In the title compound, C23H38O5, the oxabicyclo-[2.2.1]heptane-2,3-dicarb-oxy-lic anhydride unit has a normal geometry and the tetra-decoxymethyl side chain is fully extended. In the crystal, mol-ecules are linked head-to-head by C-H⋯O hydrogen bonds, forming two-dimensional networks propagating along the a and c-axis directions.

| S-EPMC3588970 | biostudies-literature

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| S-EPMC2979419 | biostudies-literature

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Project description:In the crystal structure of the title compound, [Ni(C(8)H(8)O(5))(H(2)O)(2)](n), the Ni(II) cation is in a Jahn-Teller-distorted octahedral coordination environment binding to two O atoms from water molecules, the bridging O atom of the bicycloheptane unit, two carboxylate O atoms from different carboxylate groups and one carboxylate O atom from a symmetry-related bridging ligand. The crystal structure is made up from layers propagating parallel to the bc plane.

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Project description:The title compound, [Cd(C(8)H(8)O(5))(C(3)H(4)N(2))(2)](n), was synthesized by the reaction of 7-oxabicyclo-[2.2.1]heptane-2,3-dicarboxylic anhydride, cadmium acetate and imidazole. The Cd(II) atom is seven-coordinated in a distorted penta-gonal-bipyramidal configuration by five O atoms from carboxyl-ate groups of three 7-oxabicyclo-[2.2.1]heptane-2,3-dicarboxylate ligands and two N atoms from two imidazole ligands. The crystal structure is stabilized by N-H?O and C-H?O hydrogen-bonding and C-H?? inter-actions.

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| S-EPMC3588462 | biostudies-literature

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Project description:The title compound, C(8)H(10)O(5)·C(2)H(3)N(3)S·H(2)O, was synthesized by the reaction of 2-amino-1,3,4-thia-diazole with norcantharidin. The crystal structure is stabilized by N-H?O, N-H?N, O-H?O and O-H?N hydrogen bonds. In addition, weak ?-? inter-actions are observed between symmetry-related thia-diazole ring systems [centroid-centroid distance = 3.9110?(3)?Å, inter-planar spacing = 3.4845?Å].

| S-EPMC2969213 | biostudies-literature

The 1:1 cocrystal of rac-7-oxabicyclo-[2.2.1]heptane-2,3-dicarboxylic acid and 2-amino-benzothia-zole.

Project description:In the crystal structure of the title compound, rac-7-oxabicyclo-[2.2.1]heptane-2,3-dicarboxylic acid-2-amino-benzo-thia-zole (1/1), C(8)H(10)O(5)·C(7)H(6)N(2)S, mol-ecules of each component are linked into centrosymmetric dimers by inter-molecular N-H?O hydrogen bonds. These dimers are connected by O-H?O hydrogen bonds into a chain along the b axis. In addition, ?-? inter-actions between aromatic heterocycles occur [centroid-centroid distance of 3.4709?Å and inter-planar spacing of 3.4374?Å between symmetry-related benzothia-zole ring systems.

| S-EPMC2962073 | biostudies-literature

Tris(1H-imidazole-κN)(7-oxabicyclo-[2.2.1]heptane-2,3-dicarboxyl-ato-κO,O,O)cobalt(II) 3.35-hydrate.

Project description:In the crystal structure of the title compound, [Co(C(8)H(8)O(5))(C(3)H(4)N(2))(3)]·3.35H(2)O, the central Co(II) ion is in a slightly distorted octa-hedral environment, coordinated by the bridg-ing O atom from the bicyclo-[2.2.1]heptane ligand, by two carboxyl-ate O atoms from two different carboxyl-ate groups and by three N atoms from imidazole ligands. Uncoordinated water mol-ecules, some of them disordered, are present in the crystal structure. In the crystal structure, mol-ecules are linked by O-H⋯O, N-H⋯O and O-H⋯N hydrogen-bonding inter-actions.

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