【摘要】 以1-乙基咪唑为原料,合成了布朗斯特酸性离子液体——1-乙基-3-丁基磺酸咪唑对甲苯磺酸盐(IL1),并将其用于催化芳香醛与5,5-二甲基-1,3-环己二酮或1,3-环己二酮在无溶剂条件下合成了系列氧杂蒽类化合物,其结构经1H NMR,13C NMR和ESI-MS表征。研究结果表明:当IL1用量为5 mol%,于80℃反应40 min,收率78%~95%;IL1循环使用3次,收率86%~89%,催化活性无明显变化。更多还原

【Abstract】 Brnsted acidic ionic liquid,1-ethyl-3-( 4-sulfobutyl)-1H-imidazol-3-ium p-toluenesulfonate( IL1),was prepared using 1-ethylimidazole as raw material. A series of xanthenes were synthesized by condensation reaction of aromatic aldehydes with 5,5-dimethyl-1,3-cyclohexanedione or 1,3-cyclohexanedione catalyzed by IL1 under solvent-free conditions. The structures were characterized by1 H NMR,13 C NMR and ESI-MS. The results indicated that 5 mol% IL1 as catalyst,reaction at 80 ℃for 40 min,the yields were 78% ~ 95%. The catalytic activity of IL1 keep stable with the yields of86% ~ 89% after recycling of three times.更多还原