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Synthesis of new polydentate pyrazolyl-ethene ligands by interaction of 1H-pyrazole and 1,1,2,2-tetrabromoethane in a superbasic medium

✍ Scribed by Andrei S. Potapov; Evgenia A. Nudnova; Andrei I. Khlebnikov; Vladimir D. Ogorodnikov; Tatiana V. Petrenko

Publisher: Journal of Heterocyclic Chemistry
Year: 2011
Tongue: English
Weight: 202 KB
Volume: 48
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.566

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✦ Synopsis

Abstract

Reaction of pyrazole and 1,1,2,2‐tetrabromoethane in a superbasic medium dimethylsulfoxide‐potassium hydroxide was investigated, and a number of pyrazolyl‐ and bromo‐substituted ethenes, which are the products of concurrent substitution and elimination reactions, were identified. Carrying out the reaction using different reagent mole ratios allowed to selectively isolate Z‐1,2‐bis(pyrazol‐1‐yl)ethene, 1,1,2‐tris(pyrazol‐1‐yl)ethane, and 1,1,2,2‐tetrakis(pyrazol‐1‐yl)ethane. Crystal structure of {Z‐1,2‐bis (pyrazol‐1‐yl)ethene}dichlorozinc was established using X‐ray diffraction method. J. Heterocyclic Chem., (2011).

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