Levulinic esters from the acid-catalysed reactions of sugars and alcohols as part of a bio-refinery
作者:Xun Hu、Chun-Zhu Li
DOI:10.1039/c1gc15272f
日期:——
Polymeric humin formation greatly diminishes levulinic acid yields in acid treatment of C6 sugars in aqueous medium. Protecting reactive functional groups of sugars and reaction intermediates via acetalisation and etherification in methanol medium effectively suppresses humin formation and remarkably enhances the production of levulinic esters.
An efficient approach to synthesizing 2,5-bis(<i>N</i>-methyl-aminomethyl)furan from 5-hydroxymethylfurfural <i>via</i> 2,5-bis(<i>N</i>-methyl-iminomethyl)furan using a two-step reaction in one pot
作者:Jie Zhang、Wenlong Jia、Yong Sun、Shuliang Yang、Xing Tang、Xianhai Zeng、Lu Lin
DOI:10.1039/d1gc01635k
日期:——
reaction conditions. The conversion of HMF to BMIF underwent the fast amination of HMF to 5-(methyl-iminomethyl)furfuryl alcohol (MIFA), the subsequent rate-limiting oxidation of MIFA to 5-(methyl-iminomethyl)furfural (MIFF) and the final fast amination of MIFF to BMIF. The quick amination of MIFF to BMIF drove the oxidation reaction equilibrium toward MIFF from MIFA, which ensured the highly efficient conversion
Etherification of 5-hydroxymethylfurfural using a heteropolyacid supported on a silica matrix
作者:Omar M. Portilla-Zuñiga、José J. Martínez、Mónica Casella、Daniela I. Lick、Ángel G. Sathicq、Rafael Luque、Gustavo P. Romanelli
DOI:10.1016/j.mcat.2020.111125
日期:2020.10
etherification reaction of HMF and n-BuOH. Materials were synthesized with a Preyssler acid load of 12.5% w/w using the sol-gel technique, which improved surface areas and modulated their acid strength. Prepared materials were used as heterogeneous solid acid catalysts in the selective etherification of 5-hydroxymethylfurfural (HMF) to 5-butoxymethylfurfural (5BMF). The high catalyticperformance of the bulk
Phosphotungstic acid heterogenized by assembly with pyridines for efficient catalytic conversion of fructose to methyl levulinate
作者:Chengjiang Fang、Yan Li、Wenfeng Zhao、Weibo Wu、Hu Li、Chao He、Song Yang
DOI:10.1039/c8ra02278j
日期:——
conditions. The catalysts were characterized systematically, and the effects of different substituents in pyridine, reaction temperature/time, catalyst dose, and fructose concentration studied. The 3-FPYPW hybrid prepared from 3-fluoropyridine and phosphotungstic acid exhibited superior catalytic activity for the synthesis of ML (82.5%) from fructose (97.8%). A possible reaction pathway was proposed
固体酸催化的糖降解被认为是合成乙酰丙酸烷基酯(可用作燃料添加剂和表面活性剂)的有效方法。然而,这些催化过程通常涉及苛刻的反应条件和催化剂制备的高成本。我们通过简单的溶剂热法制备了一系列磷钨酸有机杂化物,并将其用作多相催化剂,在温和的反应条件下高效地将果糖在甲醇中选择性降解为乙酰丙酸甲酯(ML)。系统地对催化剂进行了表征,研究了吡啶中不同取代基、反应温度/时间、催化剂用量和果糖浓度的影响。由 3-氟吡啶和磷钨酸制备的 3-FPYPW 杂化物对果糖 (97.8%) 合成 ML (82.5%) 表现出优异的催化活性。提出了一种可能的反应途径。此外,催化剂可以很容易地从反应混合物中分离出来,并且可以在没有明显损失反应性的情况下重复使用。
The Production of 5-Hydroxymethylfurfural from Fructose in Isopropyl Alcohol: A Green and Efficient System
作者:Linke Lai、Yugen Zhang
DOI:10.1002/cssc.201100489
日期:2011.12.16
Solving problems: An isopropyl alcohol‐mediated reaction system for the production of 5‐hydroxymethylfurfural (HMF) fromfructose reaches a yield of up to 87 %. The solvent can be easily recycled by evaporation, giving the HMF product. The system avoids the use of large amounts of organic solvent, has a minimal environmental impact, and offers a new route to large‐scale economically viable processes