碳水化合物的酸催化转化为乙酰丙酸酯,然后进行金属催化氢化是一种从生物质中获得γ-戊内酯(GVL)的重要方法。在这项工作中,我们制备了二乙烯基苯与酸性离子液体(PDVB-IL)高度交联的聚合物,并在TiO 2(Co / TiO 2),其特征在于通过傅立叶变换红外(FTIR)光谱,扫描电子显微镜(SEM),透射电子显微镜(TEM)和元素分析。结果表明,PDVB-IL聚合物可以有效催化糠醇(FAL),5-羟甲基糠醛(HMF)和果糖与乙醇的酯化反应,生成中间体乙酰丙酸乙酯(EL)和反应混合物中的EL。将其在Co / TiO 2上直接氢化成GVL,而无需纯化且产率高。
Dehydration of glucose into 5-hydroxymethylfurfural in SO3H-functionalized ionic liquids
作者:Fu-Rong Tao、Chen Zhuang、Yue-Zhi Cui、Jing Xu
DOI:10.1016/j.cclet.2014.01.044
日期:2014.5
Abstract The continuous dehydration of d -glucose into 5-hydroxymethylfurfural (HMF) was carried out under mild conditions, using SO 3 H-functionalized acidic ionicliquids as catalysts and H 2 O-4-methyl-2-pentanone (MIBK) biphasic system as solvent. High glucose conversion of 97.4% with HMF yield of 75.1% was obtained at 120 °C for 360 min, also, small amounts of levulinic acid (LA) and formic acid
A polymer support immobilized acidic ionic liquid was prepared by copolymerization of 3-vinyl-1-(4-sulfonic acid)butylimidazolium hydrogen sulfate with styrene in the presence of benzoyl peroxide and its primary application as a solid acidic heterogeneous catalyst to the synthesis of Hantzsch 1,4-dihydropyridines through a one-pot three-component reaction of aromatic aldehydes, ethyl acetoacetate and ammonium acetate was investigated. The results showed that this heterogeneous catalyst has high catalytic activity and the desired products were obtained in good to high yields. Moreover, the catalyst was found to be reusable and a considerable catalytic activity still could be achieved after third run.