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钨过氧酸盐离子液体催化过氧化氢氧化苯甲醇制苯甲酸

孙晓云1,2,3,李静3,岳爽3,杜艳芳3,臧树良3*   

  1. (1.华东师范大学化学系 上海 2000621；2.沈阳航空航天大学理学院 沈阳 100136；
    3.辽宁大学稀散元素化学研究所 沈阳 110036)
  • 收稿日期:2012-07-12 修回日期:2012-10-15 出版日期:2013-04-10 发布日期:2013-04-10
  • 通讯作者: 臧树良，教授; Tel/Fax:024-62202006; E-mail:slzang@lnpu.edu.cn; 研究方向：稀散元素
  • 基金资助:
    国家自然科学基金(21071073，21101084)辽宁省科技厅博士启动基金(20111036)辽宁大学青年科研基金(2010LDQN18)资助项目

Methyltri-n-octylammonium Peroxotungstate Ionic Liquid Catalized Hydrogen Peroxide Oxidation of Benzyl Alcohol to Benzoic Acid

SUN Xiaoyun1,2,3, LI Jing3, YUE Shuang3, DU Yanfang3, ZANG Shuliang3*   

  1. (1.Department of Chemistry,East China Normal University,Shanghai 200062,Chinaa;
    2.College of Science,Shenyang Aerospace University,Shenyang 110136,China;
    3.Institute of Rare and Scattered Elements Chemistry,Liaoning University,Shenyang 110036,China)
  • Received:2012-07-12 Revised:2012-10-15 Published:2013-04-10 Online:2013-04-10

PDF

1685

被引次数

8 | 2

摘要： 用甲基三辛基氯化铵和钨酸钠一步法合成甲基三辛基季铵钨酸盐离子液体[(CH3)N(n-C8H17)3]2W2O11，以该离子液体为催化剂，在无反应溶剂条件下催化过氧化氢氧化苯甲醇生成苯甲酸。 考察了反应温度、催化剂用量以及氧化剂过氧化氢用量对苯甲酸产率的影响。 确定优化条件：反应温度70 ℃，苯甲醇用量5 mmol，催化剂用量是底物的0.4%(摩尔分数)，30%过氧化氢用量2 mL，苯甲醇的转化率可达99%，苯甲酸选择性为98%。 该方法具有反应条件温和、产率高和选择性好的优点。

关键词: 离子液体, 苯甲醇, 苯甲酸, 催化氧化

Abstract: An ionic liquid methyltri-n-octylammonium peroxotungstate [(CH3)N(n-C8H17)3]2W2O11 was synthesized via an one-step process using methyl trioctyl ammonium chloride [(CH3)N(n-C8H17)3]Cl and sodium tungstate as precursors. The oxidation of benzyl alcohol to benzoic acid by H2O2 was studied using the obtained ionic liquid as catalyst under solvent-free condition. The optimized reaction conditions are: the amount of benzyl alcohol substrate is 5.0 mmol, the molar fraction of ionic liquid catalyst to the substrate is 0.4%, the amount of hydrogen peroxide is 20.0 mmol and the reaction temperature is 70 ℃. Under these optimized conditions, the conversion of benzyl alcohol can reach 99% while the selectivity is over 98%. The advantages of this reaction include solvent free, mild reaction conditions, high yield and selectivity of target product.

Key words: Ionic liquid, Benzyl alcohol, Benzoic acid, Oxidation

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