The invention relates to a class of novel Brønsted acidic ionic liquids each having a lactam cation, and to a method for preparing the same through simple neutralization reaction of a lactam, which is available in large scale from industry, with a Brønsted inorganic or organic acid under room temperature. The properties of the lactam Brønsted acidic ionic liquids are as follows: they are water- and moisture-stable; they are more environmentally benign and lower cost than that of dialkylimidazolium salts; they have stronger Brønsted acidity and can be used as acidic catalysts and media instead of inorganic corrosive acids, such as concentrated sulfuric acid and hydrofluoric acid, in many acid-catalyzed reactions; and they can also be used as green media for extraction and separation.
本发明涉及一类新型的Brønsted酸性
离子液体,每种
离子液体都具有内酰胺阳离子,并且通过在室温下使用从工业中大规模生产的内酰胺与Brønsted无机或有机酸进行简单的中和反应制备。内酰胺Brønsted酸性
离子液体的性质如下:它们具有耐
水和耐
潮湿性;它们比二烷基
咪唑盐更环保且成本更低;它们具有更强的Brønsted酸性,可以在许多酸催化反应中代替无机腐蚀性酸,如浓
硫酸和
氢氟酸,作为酸催化剂和介质使用;它们还可以用作绿色媒介进行提取和分离。