共查询到19条相似文献,搜索用时 78 毫秒
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综述了离子液体作为催化剂和绿色溶剂在Friedel-Crafts、Diels-Alder反应等有机合成反应中的应用,利用离子液体解决了催化剂的回收问题,避免了挥发性有机溶剂对环境的污染,实现了有机合成的绿色化。 相似文献
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综述了近年来室温离子液体作为绿色溶剂和催化剂在有机合成反应中应用的研究进展,主要有Friedel-Crafts反应,Diels-Alder反应,Heck偶联反应,缩合反应等,为有机合成的绿色化工业应用及研究提供参考。 相似文献
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离子液体作为一种新型的环境友好的反应介质,以其蒸汽压低、密度大、具有独特的溶剂性能引起了世界各国的普遍重视,离子液体负载催化剂、试剂简化了产物分离和催化剂的回收和循环利用,成为绿色化学的重要手段,有着极其广阔的发展前景。 相似文献
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离子液体由于具有特殊的性质,包括挥发性低、极性大、良好的热稳定性、通过调整阴阳离子选择不同的溶解性等特点,已经作为反应介质或催化剂广泛应用于有机合成领域,引起了人们足够的兴趣.与传统有机溶剂反应相比,离子液体相反应得到的产物收率高,选择性好,加快部分类型反应的速率,后处理简单以及离子液体催化剂体系简单,回收后,可多次重复使用.本文综述了离子液体作为反应介质或催化剂在有机合成传统反应类型中的最新研究成果,主要包括:氧化还原反应、Beckmann重排反应、偶联反应、Diels- Alder反应、氢甲酰化反应、Knoevenagel缩合、烷基化及Blanc氯甲基化反应. 相似文献
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离子液体在有机合成中的应用新进展 总被引:1,自引:0,他引:1
室温下的离子液体作为一种绿色、环保、可替代传统有机溶剂的新型溶剂受到了极大关注.总结了近年来离子液体在有机合成反应中的研究新进展,包括氧化反应、还原反应、Friedel-Crafts反应、Diels-Alder反应、Heck反应、硝化反应及其它合成反应. 相似文献
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简要介绍了现代有机分析化学的产生、发展及应用新进展,重点综述了:(1)新型纳米材料在现代有机分析中的应用;(2)现代有机分析在医药学研究中的应用;(3)现代有机分析在食品分析及食品化学中的应用。并对现代有机分析化学的发展进行了展望。 相似文献
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在有机合成实验教学中,通过优选实验项目、设计实验体系及改进实验方法等手段,达到节约环保、减少物料的使用与排放、在实验过程中引导学生树立绿色化学思想观念和增强环境保护意识的目的. 相似文献
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综述了近年来离子液体介质中CO2电活化合成有机碳酸酯的研究进展, 着重概述了电催化合成碳酸二甲酯(DMC)和环状碳酸酯的研究现状, 并简述了CO2间接电活化和直接电活化技术, 以及反应介质、电极材料等因素对反应产物的影响, 对电催化还原CO2的关键技术和今后研究重点进行了探讨。离子液体具有不易挥发、可循环使用、导电性好、对CO2有较高溶解度等优点, 在CO2固定和有机资源化研究中日益受到重视。电化学作为一种环境友好的绿色合成新技术, 在CO2有机资源化方面有很好的应用前景, 对缓解日益严峻的温室效应、实现CO2的资源化利用具有十分重要的现实意义。 相似文献
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The effect of morphology on ion transport in ionic liquid-based solid-state films was investigated. In this study, mixtures of a block copolymer, poly(styrene-b-methyl methacrylate) (SbMMA), and an ionic liquid (IL), 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide (EMIm-TFSI), were prepared as clear solid-state films at various IL compositions (0-50 wt%) by solution casting from a volatile co-solvent. The IL was preferentially miscible with the MMA block as evidenced by visual inspection and differential scanning calorimetry. Both equilibrium and non-equilibrium morphologies were identified with X-ray scattering and transmission electron microscopy and the morphology varied with MMA/IL volume fraction. The morphology and microdomain orientation had a significant impact on ionic conductivity. Higher through-plane conductivities were observed in morphologies with a three-dimensionally continuous conducting path (e.g., non-conducting S cylinders) compared to morphologies with a non-continuous conducting path (e.g., lamellae). When the lamellae were oriented in the plane, the through-plane conductivity was significantly lower than the in-plane conductivity, while the conductivity was direction-independent when the morphologies have a continuous conductive path. Also, a significant increase in conductivity was observed with increasing IL content at the glass transition of the conductive (MMA/IL) microdomain. Finally, significantly higher ionic conductivities can be achieved in a block copolymer/IL solid-state film compared to a homopolymer/IL film at the same IL content (wt%), because the non-conductive microdomain excludes IL, which produces a higher local IL concentration in the conductive phase. 相似文献
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Sumei Zhang 《Electrochimica acta》2005,50(20):4097-4103
Six novel ionic liquids based on benzotriazolium ion were synthesized by an improved method. These ionic liquids were characterized by IR, 1H NMR, and elemental analysis. Their melting point, thermal stability, conductivity, electrochemical window and solubility properties in common solvents were investigated. The results indicate that these ionic liquids show the higher thermal stability (up to 345 °C), the larger electrochemical window of 3 V, the peculiar solubility in traditional solvents and the excellent electrochemical medium in the electrochemical oxidation of naphthalene and ferrocene. 相似文献
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