Aqueous olefin metathesis with ᴅ-glucose-based bromides giving more efficient catalysis
作者:Natalia Barteczko、Mirosława Grymel、Karol Erfurt、Agata Jakóbik-Kolon、Alina Brzęczek-Szafran、Anna Chrobok
DOI:10.1016/j.molliq.2023.122484
日期:2023.9
Ring-closing metathesis of a model substrate, diethyl diallylmalonate, was used to study a new catalytic system based on the commercially available HG2 catalyst and ionic liquids derived from ᴅ-glucose employed as surfactants in an aqueous metathesis reaction. The quantity, structure, and concentration of ᴅ-glucose-based bromides were optimized to obtain high product yield and purity. (N-[2-(β-ᴅ-g
模型底物二乙酯二乙酯的闭环复分解用于研究一种基于市售 HG2 催化剂和源自 ᴅ-葡萄糖的离子液体的新型催化系统,该离子液体在水性复分解反应中用作表面活性剂。优化 ᴅ-葡萄糖基溴化物的数量、结构和浓度,以获得高产品产量和纯度。(N-[2-(β-ᴅ-吡喃葡萄糖基)乙基]-N,N-二甲基-N-十二烷基溴化铵)是活性最强的表面活性剂,临界胶束浓度为 0.020 mol/dm3。HG2 在 25 °C 下以真正的催化量 (0.2 mol%) 使用,能够在 180 分钟内合成产物。获得了高转化率 (88%) 和选择性 (100%),产品中 Ru 含量低。模型复分解反应可以进行 5 个循环,而不会损失表面活性,并且产物中的 Ru 含量较低。1H NMR 波谱研究表明,在催化剂存在下,胶束的形成和底物的转化转化为产物。