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

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 re...

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Bibliographic Details
Published in:Journal of heterocyclic chemistry 2011-05, Vol.48 (3), p.645-651
Main Authors: Potapov, Andrei S., Nudnova, Evgenia A., Khlebnikov, Andrei I., Ogorodnikov, Vladimir D., Petrenko, Tatiana V.
Format: Article
Language:English
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Summary: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).
ISSN:0022-152X
1943-5193
DOI:10.1002/jhet.566