Conversion of di­aryl­chalcones into 4,5-di­hydro­pyrazole-1-carbo­thio­amides: mol­ecular and supra­molecular structures of two precursors and three products

Shaibah, Mohammed A. E. and Yathirajan, H. S. and Asma and Manju, Nagaraja and Kalluraya, Balakrishna and Rathore, Ravindranath S. and Glidewell, Christopher (2020) Conversion of di­aryl­chalcones into 4,5-di­hydro­pyrazole-1-carbo­thio­amides: mol­ecular and supra­molecular structures of two precursors and three products. Acta Crystallographica Section E, 76 (3). pp. 360-365. ISSN 2056-9890

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Abstract

Chalcones of type 4-XC6H4C(O)CH=CHC6H4(OCH2CCH)-4, where X = Cl, Br or MeO, have been converted to the corresponding 4,5-di­hydro­pyrazole-1-carbo­thio­amides using a cyclo­condensation reaction with thio­semicarbazide. The chalcones 1-(4-chloro­phen­yl)-3-[4-(prop-2-yn­yloxy)phen­yl]prop-2-en-1-one, C18H13ClO2, (I), and 1-(4-bromo­phen­yl)-3-[4-(prop-2-yn­yloxy)phen­yl]prop-2-en-1-one, C18H13BrO2, (II), are isomorphous, and their mol­ecules are linked into sheets by two independent C—H⋯π(arene) inter­actions, both involving the same aryl ring with one C—H donor approaching each face. In each of the products (RS)-3-(4-chloro­phen­yl)-5-[4-(prop-2-yn­yloxy)phen­yl]-4,5-di­hydro­pyrazole-1-carbo­thio­amide, C19H16ClN3OS, (IV), (RS)-3-(4-bromo­phen­yl)-5-[4-(prop-2-yn­yloxy)phen­yl]-4,5-di­hydro­pyrazole-1-carbo­thio­amide, C19H16BrN3OS, (V), and (RS)-3-(4-meth­oxy­phen­yl)-5-[4-(prop-2-yn­yloxy)phen­yl]-4,5-di­hydro­pyrazole-1-carbo­thio­amide, C20H19N3O2S, (VI), the reduced pyrazole ring adopts an envelope conformation with the C atom bearing the 4-prop-2-yn­yloxy)phenyl substituent, which occupies the axial site, displaced from the plane of the four ring atoms. Compounds (IV) and (V) are isomorphous and their mol­ecules are linked into chains of edge-fused rings by a combination of N—H⋯S and C—H⋯S hydrogen bonds. The mol­ecules of (VI) are linked into sheets by a combination of N—H⋯S, N—H⋯N and C—H⋯π(arene) hydrogen bonds. Comparisons are made with the structures of some related compounds.

Item Type:	Article
Uncontrolled Keywords:	synthesis, cyclocondensation, chalcones, heterocyclic compounds, reduced pyrazoles, crystal structures, molecular conformation, hydrogen bonding, supramolecular assembly
Subjects:	C Chemical Science > Chemistry
Divisions:	Department of > Chemistry
Depositing User:	C Swapna Library Assistant
Date Deposited:	19 Feb 2020 05:57
Last Modified:	19 Feb 2020 05:57
URI:	http://eprints.uni-mysore.ac.in/id/eprint/11314

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