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The title compound, C(14)H(10)Br(2)O, is a biphenyl derivative containing a -CH(2)-O-CH(2)- bridge in the 2,2'-position. The compound displays a twisted conformation with the two benzene rings making a dihedral angle of 45.02 (5)°, while the central seven-membered ring is in a boat conformation. The mol-ecule lies on a crystallographic twofold axis of symmetry passing through the O atom and bis-ecting the 1,1' C-C bond.
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http://dx.doi.org/10.1107/S1600536808018175 | DOI Listing |
Chemistry
December 2022
Department of Chemistry, Faculty of Science, Hokkaido University, N10W8, North-ward, Sapporo, 060-0810, Japan.
10,11-Bis[bis(4-dimethylaminophenyl)methylene]dibenzo[bf]thiepin (1) and -oxepin (2) were prepared as stable yellow crystalline compounds, which are the cyclic analogues of electron-donating hexaarylbutadienes. Upon two-electron oxidation, they are reversibly transformed into the title dications (1 and 2 ) exhibiting near-infrared (NIR) absorptions, which were also isolated as stable salts. These redox pairs can serve as new entries into less well-explored organic NIR-electrochromic systems, and the separation of redox peaks (electrochemical bistability) was attained for 1/1 and 2/2 , thanks to drastic geometrical changes between neutral and dicationic states, as revealed by a series of X-ray analyses.
View Article and Find Full Text PDFActa Crystallogr E Crystallogr Commun
December 2020
Department of Biomedical & Pharmaceutical Sciences, University of Montana, Missoula, MT 59812, USA.
The title compound, CHNO, is a rearrangement product of an -pyridinyl anthracenyl isoxazole ester. It features a bicyclic acetal structure, which has two extended almost co-planar ring systems, which subtend a fold angle of 102.17 (5)°.
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March 2020
Department of Chemistry, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
Acta Crystallogr C Struct Chem
May 2018
Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina.
As part of a project studying the secondary metabolites extracted from the Chilean flora, we report herein three new β-agarofuran sesquiterpenes, namely (1S,4S,5S,6R,7R,8R,9R,10S)-6-acetoxy-4,9-dihydroxy-2,2,5a,9-tetramethyloctahydro-2H-3,9a-methanobenzo[b]oxepine-5,10-diyl bis(furan-3-carboxylate), CHO, (II), (1S,4S,5S,6R,7R,9S,10S)-6-acetoxy-9-hydroxy-2,2,5a,9-tetramethyloctahydro-2H-3,9a-methanobenzo[b]oxepine-5,10-diyl bis(furan-3-carboxylate), CHO, (III), and (1S,4S,5S,6R,7R,9S,10S)-6-acetoxy-10-(benzoyloxy)-9-hydroxy-2,2,5a,9-tetramethyloctahydro-2H-3,9a-methanobenzo[b]oxepin-5-yl furan-3-carboxylate, CHO, (IV), obtained from the seeds of Maytenus boaria and closely associated with a recently published relative [Paz et al. (2017). Acta Cryst.
View Article and Find Full Text PDFActa Crystallogr E Crystallogr Commun
August 2015
Department of Chemistry and Biochemistry, University of Montana, 32 Campus Drive, Missoula, Montana 59812, USA.
The absolute structure of the title compound preaustinoid A1 [systematic name: (5aR,7aS,8R,10S,12R,13aR,13bS)-methyl 10-hy-droxy-5,5,7a,10,12,13b-hexa-methyl-14-methyl-ene-3,9,11-trioxohexa-deca-hydro-8,12-methano-cyclo-octa-[3,4]benzo[1,2-c]oxepine-8-carboxyl-ate], C26H36O7, has been determined by resonant scattering using Cu Kα radiation [Flack parameter = 0.07 (15)]. The structure is consistent with that reported previously [Stierle et al.
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