A chalcone showing positional disorder, two related diarylcyclohexenones showing enantiomeric disorder and a related hydroxyterphenyl, all derived from simple carbonyl precursors

Salian, V. V. and Narayana, B. and Yathirajan, H. S. and Akkurt, M. and Celik, Omer and Ersanli, C. C. and Glidewell, Christopher (2015) A chalcone showing positional disorder, two related diarylcyclohexenones showing enantiomeric disorder and a related hydroxyterphenyl, all derived from simple carbonyl precursors. Acta Crystallographica Section C-Structural Chemistry, 71 (7). 610+. ISSN 2053-2296

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Abstract

Four compounds are reported, all of which lie along a versatile reaction pathway which leads from simple carbonyl compounds to terphenyls. (2E)-1-(2,4- Dichlorophenyl)-3-4-(prop-1-en-2-yl)phenyl]prop-2-en-1-one, C18H14Cl2O, (I), prepared from 4-(prop-1-en-2-yl)benzaldehyde and 2,4-dichloroacetophenone, exhibits disorder over two sets of atomic sites having occupancies of 0.664 (6) and 0.336 (6). The related chalcone (2E)-3-(4-chlorophenyl)-1-(4-fluorophenyl)-prop-2-en-1-one reacts with acetone to produce (5RS)-3-(4-chlorophenyl)-5-4-(propan-2-yl)phenyl]cyclohex-2-en-1-one, C21H21ClO, (II), which exhibits enantiomeric disorder with occupancies at the reference site of 0.662 (4) and 0.338 (4) for the (5R) and (5S) forms; the same chalcone reacts with methyl 3-oxobutanoate to give methyl (1RS, 6SR)-4-(4-chlorophenyl)-6-4-(propan-2-yl)phenyl]-2-oxocyclohex-3-ene- 1-carboxylate, C23H23ClO3, (III), where the reference site contains both (1R,6S) and (1S,6R) forms with occupancies of 0.923 (3) and 0.077 (3), respectively. Oxidation, using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, of ethyl (1RS, 6SR)-6-(4-bromophenyl)-4-(4-fluorophenyl)-2-oxocyclohex-3-ene-1-carboxyl ate, prepared in a similar manner to (II) and (III), produces ethyl 4 `'-bromo-4-fluoro-5'-hydroxy-1,1':3',1 `'-terphenyl-4'-carboxylate, C21H16BrFO3, (IV), which crystallizes with Z' = 2 in the space group P (1) over bar. There are no significant intermolecular interactions in the structures of compounds (I) and (II), but for the major disorder component of compound (III), the molecules are linked into sheets by a combination of C-H center dot center dot center dot O and C-H center dot center dot center dot pi(arene) hydrogen bonds. The two independent molecules of compound (IV) form two different centrosymmetric dimers, one built from inversion-related pairs of C-H center dot center dot center dot O hydrogen bonds and the other from inversion-related pairs of C-H center dot center dot center dot pi(arene) hydrogen bonds. Comparisons are made with related compounds.

Item Type:	Article
Uncontrolled Keywords:	chalcones; diarylcyclohexenones; terphenyls; crystal structure; supramolecular aggregation; enantiomeric disorder; hydrogen bonding
Subjects:	C Chemical Science > Chemistry
Divisions:	Department of > Chemistry
Depositing User:	Users 19 not found.
Date Deposited:	03 Jun 2019 10:07
Last Modified:	11 Aug 2022 11:14
URI:	http://eprints.uni-mysore.ac.in/id/eprint/2111

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