制备和表征了具有温控相转移特性的酸功能化离子液体1-(3-磺酸)-丙基-3-聚乙二醇咪唑磷酸二氢盐[PEOIM-SO3H]H2PO4,并用于催化α-蒎烯水合反应.结果表明,该离子液体具有较好的温控相转移和酸催化性能,在n(α-蒎烯)∶n(氯乙酸)∶n(水)=1∶1∶5、α-蒎烯0.06mol、离子液体3.0mmol、80℃反应8h的条件下,α-蒎烯转化率达89.4%,松油醇选择性达65.0%.另外,该离子液体重复使用5次后,α-蒎烯转化率仍达85.8%,松油醇选择性为66.8%,具有较好的重复使用性能.
A novel thermoregulated-acidic ionic liquid, 1-(3-sulfonic acid)-propyl-3-polyethylene glycol-yl imidazole dihydrogen phosphate ([PEOIM-SOaH]H2PO4), was synthesized, characterized, and used as a catalyst in the hydration of a-pinene. The ionic liquid had good thermoregulated and acidic catalytic performance in the hydration. Under the optimum conditions of n(a-pinene):n(chloroacetic):n(water) = 1:1:5, a-pinene 0.06 tool, ionic liquid 3.0 mmol, reaction temperature 80 ℃, and reaction time 8 h, the a-pinene conversion was more than 89% and the terpineol selectivity was 65.0%. When the ionic liquid was reused for five times, the α-pinene conversion reached 85.8% and the terpineol selectivity was 66.8%.