Int. J. Mol. Sci. 2007, 8(5), 392-398; doi:10.3390/i8050392
Article

Organo-niobate Ionic Liquids: Synthesis, Characterization and Application as Acid Catalyst in Pechmann Reactions

Valerio C. D. Soares, Melquizedeque B. Alves, Ernesto R. Souza, Ivana O. Pinto, Joel C. Rubim, Carlos Kleber Z. Andrade and Paulo A. Z. Suarez* email
Instituto de Quimica, Universidade de Brasilia, CP 4478, 70910-970, Brasilia, Brazil
* Author to whom correspondence should be addressed.
Received: 27 March 2007 / Accepted: 5 May 2007 / Published: 11 May 2007
(This article belongs to the Special Issue Ionic Liquids)
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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%.
Keywords: ionic liquids; niobium pentachloride; Pechmann reaction

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MDPI and ACS Style

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.

AMA Style

Soares VCD, Alves MB, Souza ER, Pinto IO, Rubim JC, Andrade CKZ, Suarez PAZ. Organo-niobate Ionic Liquids: Synthesis, Characterization and Application as Acid Catalyst in Pechmann Reactions. International Journal of Molecular Sciences. 2007; 8(5):392-398.

Chicago/Turabian Style

Soares, Valerio C.D.; Alves, Melquizedeque B.; Souza, Ernesto R.; Pinto, Ivana O.; Rubim, Joel C.; Andrade, Carlos K.Z.; Suarez, Paulo A.Z. 2007. "Organo-niobate Ionic Liquids: Synthesis, Characterization and Application as Acid Catalyst in Pechmann Reactions." Int. J. Mol. Sci. 8, no. 5: 392-398.

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