Brφnsted酸功能化离子液体催化环己醇脱水制备环己烯

Synthesis of Cyclohexene via Cyclohexanol Dehydration Catalyzed by Novel Brφnsted Acidic Task-specific Ionic Liquids

BrФnsted酸离子液体可催化烷基化、酯化、醚化、缩合、重排等反应，为了降低离子液体的成本及筛选新的离子液体催化剂，设计合成了BrФnsted酸功能化离子液体眠N，N-三甲基-N-磺丙基-硫酸氢铵（TMPSHS04），其结构经IR，^1HNMR，^13CNMR和MS的确证。以TMPSHSO4作为催化剂，对环己醇脱水制备环己烯的反应进行了研究。最佳反应条件为m（催化剂）：m（环己醇）=1：50，反应时间2h，反应温度170～180℃，产品收率达87．2％，GC／MS分析结果表明，产品质量分数达99．04％，产品选择性为99．3％，离子液体可以回收并重复使用，催化活性保持不变。

To decrease the product cost and search for new active catalysts, a novel BrФnsted acidic task-specific ionic liquid trimethyl-sulfopropylammonium hydrogen sulfate （TMPSHSO4 ） was prepared and its structure was confirmed by IR,^1HNMR,^13CNMR and MS. In the presence of TMPSHSO4 as catalyst and with cyclohexanol and the catalyst in molar ratio 50：1, dehydration reaction of cyclohexanol was carried out at 170～180℃ for 2 h to give cyclohexene in 87.2% yield and of 99. 04% purity. Selectivity to the product was 99.3 %. The catalyst could be reused without noticeable decrease of the catalytic activity.