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

International Journal of Molecular Sciences

Valerio C. D. Soares¹  Melquizedeque B. Alves¹  Ernesto R. Souza¹  Ivana O. Pinto¹  Joel C. Rubim¹  Carlos Kleber Z. Andrade¹ 

[1] Instituto de Quimica, Universidade de Brasilia, CP 4478, 70910-970, Brasilia, Brazil. Tel. ++55(61)33072162 – Fax++55(61)32734149. E-mail

关键词: ionic liquids;    niobium pentachloride;    Pechmann reaction;   

DOI  :  10.3390/i8050392

来源: mdpi

【 摘 要 】

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%.

【 授权许可】

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