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

The combinations of 1-butyl-3-methylimidazolium chloride with NbCl(5) 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 (1)H NMR) analysis. The Pechmann r...

Descripción completa

Detalles Bibliográficos
Autores principales: Soares, Valerio C. D., Alves, Melquizedeque B., Souza, Ernesto R., Pinto, Ivana O., Rubim, Joel C., Andrade, Carlos Kleber Z., Suarez, Paulo A. Z.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2007
Materias:
Full Research Paper
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3692303/
Descripción
Sumario:The combinations of 1-butyl-3-methylimidazolium chloride with NbCl(5) 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 (1)H 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%.

Ejemplares similares