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The title compound, C28H22O2, is a inter­mediate in the synthesis of 10,10′-dibromo-9,9′-bianthracen­yl. The mol­ecule forms both intra- and inter­molecular O—H...O hydrogen bonds.

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The asymmetric unit of the title compound, C23H23ClN4OS, contains two crystallographically independent mol­ecules in which the orientations of the propyl­amine group and chloro­phenyl rings with respect to the fused ring system are different. The terminal cyclo­hexene ring adopts a half-chair conformation. The crystal packing is stabilized by N—H...O, N—H...N and C—H...O hydrogen bonds and π–π inter­actions.

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In the mol­ecule of the title compound, C24H17Cl2N3O2S, the mean plane of the tricyclic thienopyridopyrimidine system is roughly orthogonal to both benzene planes, the dihedral angles being 107.8 (1) and 99.6 (1)° for the benzene planes in the p-chloro­phen­oxy and p-chloro­phenyl groups, respectively. The dihedral angle formed by the two benzene rings is 101.4 (1)°.

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In the title compound, C23H26N4OS, the fused tricyclic system is essentially planar. The crystal stacking is mainly due to π–π inter­actions and inter­molecular N—H...O hydrogen-bond inter­actions.

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In the structure of the title compound, C27H21Cl2N3O2S·CH2Cl2, the C-S bond lengths in the thio­phene ring [1.744 (5) and 1.745 (5) Å] are equivalent and long compared with the values observed in both free thio­phene, measured using electron diffraction, and thieno[2,3-c]pyridine. The central thieno­pyridine ring system is nearly planar and the dihedral angle between the thiophene and pyridine planes is 0.9 (1)°.

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The title compound, C26H36O5, is a derivative of abietic acid formed by an endo-Diels-Alder reaction between maleic anhydride and the diene levopimaric acid ethyl ester. The two fused and unbridged cyclohexane rings have chair conformations and the anhydride ring is planar.
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