离子液体1-乙基-3-丁基磺酸咪唑对甲苯磺酸盐催化合成氧杂蒽

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。

Synthesis of Xanthenes Catalyzed by Ionic Liquid 1-Ethyl-3-(4-sulfobutyl)-1H-imidazol-3-ium p-Toluenesulfonate

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 by ¹H NMR, ¹³C 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 of 86%~89% after recycling of three times.