Abstract
Ionic liquid with basic properties is a significant category in the wide-ranging ionic liquid field. Ionic liquids are mostly made of ions and ion pairs. They are known as powerful solvents which have potential applications. Since the 1999 review by Welton which is about room temperature ionic liquids, ionic liquids have grown as a motivating research area in the last 15 years. Some ionic liquids are liquid at room temperature include some nitrogen-based compounds. Among them, imidazolium-based ionic liquids are the most important ones. In imidazole-based ionic liquids, their physical properties like melting point and acidity-basicity could be adjusted by changing the alkyl substituents and ion pairs. Most of room temperature ionic liquids involve bulky organic cations such as 1-alkyl-3-methylimidazolium, 1-alkylpyridinium and ammonium ion. To have heterogeneous nanocatalysts using ionic liquids, it was studied that carbonaceous substrates with high surface area like graphene oxide could be the best choice. To this purpose and to have heterogeneous basic nanocatalyst with high surface area and significant catalytic activity, basic GO-Imidazolium ionic liquid was synthesized in this research. Here, N-methyl imidazole was used as cation, HCO3- as anion and GO as solid support to form basic ionic liquid nanocatalyst and its catalytic ability was used in synthesis of pyrroles as a significant N-heterocycle compound with important biological and pharmacological activity.
Highlights
IntroductionDue to ionic liquid’s exclusive properties such as a wide liquid range, good solvating ability, tunable polarity, high thermal stability, negligible vapor pressure, and ease of recyclability, there has been considerable interest in the use of ionic liquids as an environmentally benign reaction media [1]. polymerization [2], hydrogenation [3], regioselective alkylation [4], Friedel–Crafts reactions [5], dimerization of alkenes [6], Diels–Alder reactions [7], Michael reactions [8], crosscoupling reactions [9] and some enzymic reactions [10] are the examples of some organic reactions which can be carried out in ionic liquids
Basic GO-Imidazolium ionic liquid has been successfully applied for the first time to catalyze the synthesis of pyrroles
The ability of an ionic liquid as a clean catalyst and reagent has not been explored to any great extent it is of much importance in the context of the green synthesis [13, 14]
Summary
Due to ionic liquid’s exclusive properties such as a wide liquid range, good solvating ability, tunable polarity, high thermal stability, negligible vapor pressure, and ease of recyclability, there has been considerable interest in the use of ionic liquids as an environmentally benign reaction media [1]. polymerization [2], hydrogenation [3], regioselective alkylation [4], Friedel–Crafts reactions [5], dimerization of alkenes [6], Diels–Alder reactions [7], Michael reactions [8], crosscoupling reactions [9] and some enzymic reactions [10] are the examples of some organic reactions which can be carried out in ionic liquids. Due to ionic liquid’s exclusive properties such as a wide liquid range, good solvating ability, tunable polarity, high thermal stability, negligible vapor pressure, and ease of recyclability, there has been considerable interest in the use of ionic liquids as an environmentally benign reaction media [1]. Basic ionic liquids showed various advantages such as the catalytic efficiency and recycling of the ionic liquid than the combination of inorganic base and ionic liquid for some base-catalyzed processes [11, 12] and have aroused unprecedented interest. Basic GO-Imidazolium ionic liquid has been successfully applied for the first time to catalyze the synthesis of pyrroles. In our search for simple catalytic route to pyrrole derivatives, we first reported an environmentally benign methodology for this reaction
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