摘要
以H2O2为氧化剂,研究了离子液体为催化剂和溶剂,环己烯氧化生成反-1,2环-己二醇的反应。考察了不同咪唑型离子液体、反应时间、反应温度和H2O2用量等对产率和选择性的影响,实验结果表明,在7种咪唑型离子液体催化体系中,阳离子为咪唑环上含有1或2个羧基,阴离子为[PF6]的离子液体催化效果较好。反应温度为100℃,n(H2O2)∶n(Cyc lohexene)=1.1∶1,反应5 h时,离子液体c(0.60 g,2.1 mmol)催化生成的反-1,2环-己二醇的产率和选择性分别为95%和97%,而离子液体f(0.20 g,0.6 mmol)催化生成的反-1,2环-己二醇的产率和选择性分别为84%和90%,从离子液体的用量来看,含2个羧基的离子液体f的催化效率更高。
Trans-1,2-cyclohexanediol was synthesized by the oxidation of cyclohexene using H2 O2 as the oxidant and ionic liquids（ILs） as the catalyst and solvent.The effects of different imidazolium ionic liquids,reaction time,reaction temperature and the amount of H2 O2 on the yield and selectivity of trans-1,2-cyclohexanediol were investigated.The experimental results showed that ionic liquids based on imidazolium cations containing 1~2 carboxyl groups and anion exhibited the highest catalytic activities among the seven imidazolium ionic liquids.Under optimized conditions： reaction temperature 100 ℃,n（H2O2）∶n（cyclohexene）=1.1∶ 1,and reaction time 5 h,the yield and selectivity of trans-1,2-cyclohexanediol were 95% and 97% with IL c（0.60 g,2.1 mmol） as the catalyst,and 84% and 90% with IL f（0.20 g,0.6 mmol） as the catalyst,respectively.From the dosage of ionic liquid,it can be seen the catalytic efficiency of IL f containing two carboxyl groups was higher.
出处
《应用化学》
CAS
CSCD
北大核心
2011年第6期662-666,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(21006007)资助项目
关键词
离子液体
环己烯
过氧化氢溶液
反环己二醇
ionic liquids
cyclohexene
hydrogen peroxide
trans-cyclohexanediol
