Efficient esterification of n-butanol with acetic acid catalyzed by the Brönsted acidic ionic liquids: influence of acidity

Abstract

BAILs having different structures and their related acidities have been investigated for their role in the esterification of n-butanol with acetic acid, and it was found that IL-5 containing double –SO3H groups exhibits excellent catalytic activity.

Designing a novel tetradentate polyoxometalate eco-catalyst for the synthesis of β-aminocyclohexanone derivatives in water

“…[13][14][15][16][17][18] The POM compounds have been used as efficient catalysts in various chemical transformations due to their strong Brønsted acidity, thermal stabilities, lower corrosivity and higher catalytic activity. [19][20][21][22][23] The general catalysts for standard Mannich reactions mainly involve various acids. Most of these strategies suffer from problems such as using corrosive reagents, expensive and large amounts of catalyst, long reaction times, harmful reaction media (uorinated solvent), and low yields.…”

Novel Aryl-Imidazolium Ionic Liquids with Dual Brønsted/Lewis Acidity as Both Solvents and Catalysts for Friedel–Crafts Alkylation

“…Brønsted acidic ionic liquids (BAILs) previously reported in the literature also exhibit the above-mentioned advantages of ILs when compared with traditional Brønsted acidic catalysts [20,21]. Recently, many organic synthesis studies have been focused on applying strong BAILs as a dual solvent-catalyst for reactions such as esterification [22,23], Fisher indole synthesis [24,25], Mannich-type reactions [26], dehydration [27], and Beckmann rearrangement [28]. Moreover, the Friedel-Crafts alkylation that typically requires Lewis acidic catalysts has been also catalyzed by BAILs in recent years [29][30][31][32][33][34].…”

Upgrading of HMF and Biomass‐Derived Acids into HMF Esters Using Bifunctional Ionic Liquid Catalysts under Solvent Free Conditions

“…Although, enzyme catalyzed esterification are very selective as well as environmentally friendly but not suitable for industrial scale applications because of high cost of enzymes as well as significant inactivation of enzymes under different reaction conditions. Recently, ionic liquids (ILs) have been reported as catalysts for several acid‐catalyzed esterification reactions . These salts possess attractive properties like low vapor pressure, task specificity, good thermal stability, excellent solubility within the reaction media for easy separation and hence find application as solvent and catalyst ,.…”

“…Recently, ionic liquids (ILs) have been reported as catalysts for several acid-catalyzed esterification reactions. [24] These salts possess attractive properties like low vapor pressure, task specificity, good thermal stability, excellent solubility within the reaction media for easy separation and hence find application as solvent and catalyst. [25,26] Moreover, their task specificity can be tuned by selective choice of the cationic and anionic functionalities of the ILs.…”