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

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 reaction...

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Bibliographic Details
Published in:International journal of molecular sciences 2007-05, Vol.8 (5), p.392-398
Main Authors: Soares, Valerio C. D., Alves, Melquizedeque B., Souza, Ernesto R., Pinto, Ivana O., Rubim, Joel C., Andrade, Carlos Kleber Z., Suarez, Paulo A. Z.
Format: Article
Language:English
Subjects:
Acids
Catalysis
Chloride
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ionic liquids
niobium pentachloride
Pechmann reaction
Phenols
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Summary: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%.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/i8050392