Acid Catalyzed Competitive Esterification and Ketalization of Levulinic Acid with 1,2 and 1,3-Diols: The Effect of Heterogeneous and Homogeneous Catalysts
作者:Ananda S. Amarasekara、Moriam A. Animashaun
DOI:10.1007/s10562-016-1812-8
日期:2016.9
reactions of levulinic acid (LA) with 1,2-ethanediol (1,2-ED), 1,2-propanediol (1,2-PD), and 1,3-propanediol (1,3-PD) were studied using Amberlyst-15 as well as p-toluenesulfonic acid catalysts in benzene under Dean–Stark conditions. In Amberlyst-15 catalyzed reactions the products are ketals and ketal-esters, whereas p-toluenesulfonic acid catalyzed reactions produce esters and ketal-esters as products
研究了乙酰丙酸 (LA) 与 1,2-乙二醇 (1,2-ED)、1,2-丙二醇 (1,2-PD) 和 1,3-丙二醇 (1,3-PD) 的缩合反应在 Dean-Stark 条件下,在苯中使用 Amberlyst-15 和对甲苯磺酸催化剂。在 Amberlyst-15 催化反应中,产物是缩酮和缩酮酯,而对甲苯磺酸催化反应生成酯和缩酮酯作为产物。在对甲苯磺酸催化的 1,2-ED 和 1,3-PD 反应中,LA 单酯产物在 180 分钟后作为主要产物形成,产率分别为 75% 和 97%。与之前报道的乙酰丙酸乙酯与二醇的酸催化缩酮化不同,LA 与二醇的缩酮化-酯化反应是一个复杂的过程。