Acta Crystallographica Section E: Crystallographic Communications | |
Crystal structures of (1E,4E)-1,5-bis(5-bromothiophen-2-yl)-2,4-dimethylpenta-1,4-dien-3-one and (E)-4-(5-bromothiophen-2-yl)-1,3-diphenylbut-3-en-2-one | |
Kurup, M.R.P.1  Nithya, C.1  Sithambaresan, M.2  | |
[1] Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682 022, India;Department of Chemistry, Faculty of Science, Eastern University, Chenkalady, Sri Lanka | |
关键词: CRYSTAL STRUCTURE; CLAISEN-SCHMIDT; 5-BROMOTHIOPHENE-2-CARBALDEHYDE; PENTAN-3-ONE; DIBENZYLACETONE; | |
DOI : 10.1107/S205698901600058X | |
学科分类:数学(综合) | |
来源: International Union of Crystallography | |
【 摘 要 】
The title compounds, C15H12Br2OS2, (I), and C20H15BrOS, (II), were synthesized by employing Claisen–Schmidt condensation of pentan-3-one and dibenzylacetone with 5-bromothiophene-2-carbaldehyde in the presence of methanolic KOH. Even though 1:2 products were expected in both of the reactions, 1:2 and 1:1 products were obtained as (I) and (II), respectively. In (I), the two methyl groups are trans to each other, 29.5 (7) and 28.7 (7)° away from the central carbonyl bond between them, whereas the two phenyl rings of dibenzylacetone subtend a dihedral angle of 53.09 (18)°. In the crystal of (I), C—H⋯O hydrogen bonds define molecular chains along c. A second type of molecular chain is formed along b by means of C—Br⋯π interactions. These two families of molecular chains are stacked by π–π interactions, forming a three-dimensional supramolecular architecture. In (II), similar C—H⋯O hydrogen bonds as in (I) define inversion dimers, whilst C—H⋯.π interactions build a staircase structure along the a axis.
【 授权许可】
CC BY
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