单糖在咪唑基离子液体/DMSO-d6中构型分布的NMR研究OA
NMR Study of Tautomeric Distribution of Monosaccharides in Imidazolyl Ionic Liquids/DMSO-d6
单糖的构型分布可影响其转化和利用中的反应路径和产物选择性.以 DMSO-d6 为共溶剂,在 25℃条件下通过定量 1H NMR 研究了单糖在咪唑基离子液体中的构型分布规律.结果表明,在酸性离子液体中,β-吡喃糖的平衡比例由大到小为:D-葡萄糖>D-氨基葡萄糖盐酸盐>N-乙酰-D-氨基葡萄糖>D-甘露糖.D-果糖在[HSO3-BMIM]HSO4 中几乎完全转化为 5-羟甲基糠醛(由呋喃糖反应生成),在其他离子液体中平衡后呋喃糖的比例甚至高于吡喃糖的比例.两性金属氯化物与氟原子的引入可能会导致更高比例的呋喃糖的产生.[BMIM]BF4 等的添加则可能会抑制单糖的构型转化.单糖构型分布的基础数据为生物质转化的离子液体的选择与设计提供了指导.
The tautomeric distribution of monosaccharides could influence reaction pathways and product selectivity during their conversion and utilization.Using DMSO-d6 as cosolvent,we investigated the tautomeric distribution of monosaccharides in imidazolyl ionic liquids at 25℃by quantitative 1H NMR.In acidic ionic liquids,the results indicate that the proportion of β-pyranose after equilibrium decreases in the following order:D-glucose>D-glucosamine hydrochloride>N-acetyl-D-glucosamine>D-mannose.D-fructose is almost completely converted to 5-hydroxymethylfurfural(formed from the furanose)in[HSO3-BMIM]HSO4.In other ionic liquids,the proportion of furanose even exceeds that of pyranose after equilibrium.The introduction of amphoteric metal chloride and fluorine may lead to a higher proportion of furanose.The addition of[BMIM]BF4 and other reagents may inhibit the tautomeric conversion of monosaccharides.The fundamental data on monosaccharide tautomer distribution can guide the selection and design of ionic liquids for biomass conversion.
刘佳;王英雄;赵建成
太原理工大学 化学与化工学院,山西 太原 030024太原理工大学 化学与化工学院,山西 太原 030024中国科学院 山西煤炭化学研究所,山西 太原 030001
数理科学
单糖咪唑基离子液体NMR构型分布
monosaccharidesimidazolyl ionic liquidsNMRtautomeric distribution
《波谱学杂志》 2026 (2)
146-163,18
国家自然科学基金项目(22075308).
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