Int. J. Mol. Sci. 2007, 8(5), 392-398; https://doi.org/10.3390/i8050392
Organo-niobate Ionic Liquids: Synthesis, Characterization and Application as Acid Catalyst in Pechmann Reactions
Instituto de Quimica, Universidade de Brasilia, CP 4478, 70910-970, Brasilia, Brazil
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Received: 27 March 2007 / Accepted: 5 May 2007 / Published: 11 May 2007
(This article belongs to the Special Issue Ionic Liquids)
Abstract
The combinations of 1-butyl-3-methylimidazolium chloride with NbCl5 yieldedionic mixtures with different melting point temperatures and acidity depending on theniobium molar fraction. The mixtures were characterized by thermal (DSC) andspectroscopic (FT-IR and 1H NMR) analysis. The Pechmann reactions of different phenolswith ethylacetoacetate, producing coumarins, was used as model to evaluate the catalyticbehavior of these mixtures as acid Lewis catalyst. These reactions were carried out usingacidic mixtures of 60 mol%. View Full-TextKeywords:
ionic liquids; niobium pentachloride; Pechmann reaction
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Soares, V.C.D.; Alves, M.B.; Souza, E.R.; Pinto, I.O.; Rubim, J.C.; Andrade, C.K.Z.; Suarez, P.A.Z. Organo-niobate Ionic Liquids: Synthesis, Characterization and Application as Acid Catalyst in Pechmann Reactions. Int. J. Mol. Sci. 2007, 8, 392-398.
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