Inexpensive and tuneable protic ionic liquids based on sulfuric acid for the biphasic synthesis of alkyl levulinates
作者:Marta Przypis、Karolina Matuszek、Anna Chrobok、Małgorzata Swadźba-Kwaśny、Danuta Gillner
DOI:10.1016/j.molliq.2020.113166
日期:2020.6
popular for their uses as solvents, additives and intermediates. However, efficient and recyclable catalysts for their synthesis are still the subject of intensive research. In this study, a wide range of alkyl levulinates was synthesized under mild conditions (room temperature, atmospheric pressure), using inexpensive and efficient Brønsted acidic ionic liquids (ILs) based on sulfuric acid and off-the-shelf
乙酰丙酸烷基酯是生物来源的化学品,由于其用作溶剂,添加剂和中间体而越来越受欢迎。然而,用于其合成的有效且可回收的催化剂仍然是深入研究的主题。在这项研究中,使用廉价且有效的基于硫酸和现成碱的布朗斯台德酸性离子液体(ILs),在温和的条件下(室温,大气压)合成了大量的乙酰丙酸烷基酯。IL的酸度与其活性密切相关。IL易于分离和回收,在10个循环中转化率或选择性没有明显变化(产率约90–95%)。在优化的条件下,乙酰丙酸戊酯的产率为99%(模型反应)。实验证明该方法可有效合成C1-C16线性乙酰丙酸酯,支链和环状醇。这条创新的绿色途径生产乙酰丙酸烷基酯非常适合可持续发展战略。