BrΦnsted酸性离子液体催化果糖脱水制备5-羟甲基糠醛

Dehydration of Fructose to Prepare 5-Hydroxymethylfurfural Catalyzed by BrΦnsted Acidic Ionic Liquids

考察了BrΦnsted酸性离子液体催化果糖制备5-羟甲基糠醛的脱水反应,结果表明,BrΦnsted酸性离子液体1-(3-磺酸)-丙基-3-甲基咪唑氯([HO3S-(CH2)3-mim]Cl)具有较好的催化性能。在溶剂正丁醇15mL、果糖2g、催化剂1.2mmol、反应时间15min和反应温度180℃的较佳反应条件下,5-羟甲基糠醛的收率为90.1%,且分离后的离子液体不经处理直接循环使用5次后,产物收率仍可达89.5%。FT-IR、1 H NMR和13 CNMR等表征结果表明,所得产物是预期的目标化合物。

5-Hydroxymethylfurfural was synthesized by dehydration of fructose using BrΦnsted acidic ionic liquids as catalysts.The results showed that the BrΦnsted acidic ionic liquid Cl had better catalytic property.The yield of product was 90.1% under the optimum reaction conditions of n-butanol 15 mL,fructose 2 g,catalyst Cl 1.2 mmol,reaction time 15 min and temperature 180 ℃.Reusability of the ionic liquid was also examined and the yield of product was still 89.5% when it was reused for five times.The structure of product was characterized by FT-IR,1H NMR and 13C NMR.