Organo-niobate Ionic Liquids: Synthesis,Characterization and Application as Acid Catalyst in Pechmann Reactions |
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| Authors: | Valerio C. D. Soares Melquizedeque B. Alves Ernesto R. Souza Ivana O. Pinto Joel C. Rubim Carlos Kleber Z. Andrade Paulo A. Z. Suarez |
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| Affiliation: | Instituto de Quimica, Universidade de Brasilia, CP 4478, 70910-970, Brasilia, Brazil. Tel. ++55(61)33072162 – Fax++55(61)32734149. E-mail: , URL: |
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| Abstract: | The combinations of 1-butyl-3-methylimidazolium chloride with NbCl5 yielded ionic mixtures with different melting point temperatures and acidity depending on the niobium molar fraction. The mixtures were characterized by thermal (DSC) and spectroscopic (FT-IR and 1H NMR) analysis. The Pechmann reactions of different phenols with ethylacetoacetate, producing coumarins, was used as model to evaluate the catalytic behavior of these mixtures as acid Lewis catalyst. These reactions were carried out using acidic mixtures of 60 mol%. |
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| Keywords: | ionic liquids niobium pentachloride Pechmann reaction |
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