Brφnsted酸性离子液体中苯甲酸酯、苄酯的无溶剂微波合成
Synthesis of a Series of Benzoic Esters and Benzyl Esters in Novel Brφnsted Acidic Ionic Liquids under Solvent-free Microwave Irradiation Conditions
查看参考文献16篇
文摘
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该文以1-甲基咪唑、吡啶、苄基氯、硫酸、磷酸为原料,合成了4种Brφnsted酸性离子液体:1-甲基-3-苄基咪唑硫酸氢根盐(a),1-甲基-3-苄基咪唑磷酸二氢根盐(b),N-苄基吡啶硫酸氢根盐(c),N-苄基吡啶磷酸二氢根盐(d),以它们作为催化剂和反应介质,考察了苯甲酸与系列脂肪醇、苄醇与系列脂肪酸、苯甲酸在无溶剂和微波辐射反应条件下的Fischer酯化反应,结果表明,当苯甲酸或苄醇与离子液体的摩尔比为1∶0.5时,无需外加催化剂,反应即可在化学计量条件下进行,12~20 min完成反应,苯甲酸酯与苄酯的收率分别为77%~98%和78%~98.5%,气相色谱纯度≥95%。离子液体循环使用3次,催化活性仅下降1.8%~3.4%。 |
其他语种文摘
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Four easily accessible Brφnsted acidic ionic liquids, 1-methyl-3-benzylimidazolium hydrogen sulfate,1-methy-3-benzylimidazolium hydrogen phosphate,N-benzylpyridinium hydrogen sulfate,and N- benzylpyridinium hydrogen phosphate, were synthesized from the commercially available starting material N-methylimidazole, pyridine, benzyl chloride, sulphuric acid and phosphoric acid. They act as reaction media and catalyst for the synthesis of benzoic esters and benzyl esters under solvent-free and microwave irradiation conditions. When the mole ratio of benzoic acid or benzyl alcohol to ionic liquid was 1:0.5 ,the reactions proceeded smoothly with equal mole of substrates in 12-20 min and gave the products in good or excellent yields (77%-98% and 78%-98.5% respectively). The recycled ionic liquids can be used three times without significant loss of catalytic activity. |
来源
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精细化工
,2008,25(3):308-312 【核心库】
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关键词
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Brφnsted酸
;
离子液体
;
微波
;
苯甲酸酯
;
苄酯
;
精细化工中间体
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地址
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1.
中国科学院研究生院, 北京, 100039
2.
中国科学院新疆理化技术研究所, 新疆, 乌鲁木齐, 830011
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1003-5214 |
学科
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化学 |
文献收藏号
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CSCD:3223570
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