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以烯烃和三聚甲醛为原料,采用酸功能化离子液体作催化剂,在无溶剂体系中经Prins反应合成了1,3-二氧己环衍生物.对不同离子液体的催化活性进行了考察,选择[BsTmG][HSO4]作为反应的催化剂.研究了温度、时间以及原料摩尔比对反应的影响,得到较佳实验条件为:催化剂用量为烯烃摩尔量的5%,三聚甲醛与烯烃摩尔比为1∶1,温度80℃,时间10 h.该催化体系具有较好的底物适用性,离子液体[BsTmG][HSO4]经简单的萃取分离后重复使用8次,仍保持较好的催化活性.
In this paper, 1,3-dioxane derivatives were synthesized by the Prins reaction in the solvent-free system using olefins and paraformaldehyde as raw materials and the acid functionalized ionic liquids as catalysts. The catalytic activities of different ionic liquids were investigated, [BsTmG] [HSO4] was chosen as the catalyst for the reaction.The effects of temperature, time and molar ratio of the raw materials on the reaction were studied.The optimum experimental conditions were as follows: the amount of catalyst was 5% of the molar amount of olefin, the molar ratio of trioxane to olefin Was 1: 1, the temperature was 80 ℃, the time was 10 h. The catalytic system had good substrate applicability. The ionic liquid [BsTmG] [HSO4] was reused 8 times after simple extraction and separation, active.