Tunable aryl imidazolium ionic liquids (TAIILs) as environmentally benign catalysts for the esterification of fatty acids to biodiesel fuel

Mild and Efficient Tunable Brønsted Acidic Ionic Liquid Catalyzed O-Acetylation and O-Trimethylsilylation with Trimethylsilyl Acetate (TMSOAc) and Hexamethyldisilazane (HMDS)

“…Tunable Brønsted acidic ionic liquids were prepared according to the reported method [52][53][54] by using a two-step atom-economic reaction in which aryl imidazole was synthesized by using Ullmann type coupling followed by treatment with an acid, as shown in Figure 1. Newly prepared TBAILs (1a-1f) are white and yellow solids in nature without any noticeable fumes or evident degree of vapor pressure.…”

“…Newly prepared TBAILs (1a-1f) are white and yellow solids in nature without any noticeable fumes or evident degree of vapor pressure. The Brønsted acidity functions were measured with UV-visible spectroscopy using crystal violet dye as an indicator [54]. The synthesized TBAILs are completely soluble in water and willingly soluble in organic polar solvents such as methanol, ethanol, and acetone.…”

“…The synthesized TBAILs are completely soluble in water and willingly soluble in organic polar solvents such as methanol, ethanol, and acetone. The solubility order for catalysts 1a-1f is as follows 1a > 1b > 1c > 1d > 1e > 1f [54]. With increasing interest toward a greener method for the protection of alcohol, efficient, safe, and cost-effective TBAILs were employed for the O-acetylation using TMSOAc, and O-silylation using HMDS were studied.…”

“…Since halide ions are generally non-favorable for the green chemistry [49]. Our previously synthesized ionic liquids were effectively utilized for applications in various organic transformations such as Friedel-Crafts acylation using acyl chloride and thioesterification [52], per-O-acetylation using acetic anhydride, and benzylidene ring-opening [53], and fatty acids esterification [54], based on our earlier experience in the area of ionic liquids and its utility. In this protocol, we aimed to provide an easy and eco-friendly method for the protection of alcohol.…”

Frictional evaluation of halogen-free ionic liquids with low corrosion degree and high decomposition temperature on steel surface

“…Ionic liquids (ILs) are salts, which are liquid at temperatures lower than 100°C (Every et al, 2004). And it possesses many unique properties such as favorable solubility, relatively high ionic conductivity, low pressure, high thermal stability and low flammability, making them widely applied in various fields (Jiang et al, 2013;Li et al, 2010;Li et al, 2013;Castejon et al, 2014;Kasar et al, 2021;Ranu and Banerjee, 2005;Thul et al, The current issue and full text archive of this journal is available on Emerald Insight at: https://www.emerald.com/insight/0036-8792.htm 2020; Brown et al, 2001;Avilés et al, 2021). Traditional IL lubricating additives, containing phosphorus, sulfur and halogen elements, possess excellent tribological properties and have been studied by many scientists (Ye et al, 2001;Ye et al, 2002;Mordukhovich et al, 2012;Roache et al, 2021;Tsunashima et al, 2011).…”