• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Novel chiral phosphonium ionic liquids as solvents and catalysts for cycloadditions. Investigation of the Diels-Alder reaction of a series of dienes and dienophiles in novel chiral phosphonium ionic liquids.
【2h】

Novel chiral phosphonium ionic liquids as solvents and catalysts for cycloadditions. Investigation of the Diels-Alder reaction of a series of dienes and dienophiles in novel chiral phosphonium ionic liquids.

机译：新型手性phospho离子液体作为环加成的溶剂和催化剂。在新型手性phospho离子液体中一系列二烯和亲二烯体的Diels-Alder反应的研究。

页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The use of ionic liquids (ILs) as both reagents and solvents is widely recognised. ILs offer a number of advantages compared to regular molecular solvents. These advantages include: chemical and thermal stability, no measurable vapour pressure, no or lower toxicity, non-flammability, catalytic ability, high polarity and they can be recycled. There are a number of research groups investigating the various applications of this reaction medium and most studies have focused on solvents derived from the imidazolium cation.udThe use of the imidazolium-based ILs in the Diels-Alder reaction has been studied in detail and higher yields compared to conventional methods have been reported. The IL affects the rate and interesting selectivities have been observed. However, not much attention has been paid to the scope and limitations of phosphonium ILs (PILs). Therefore the focus of this thesis is the synthesis and application of novel chiral PILs as environmentally benign, task-specific solvents for the Diels-Alder reaction. In addition, this research seeks alternative ways to eliminate the use of toxic heavy metal catalysts and to exploit methodologies which reduce the energy consumption of the Diels-Alder reaction.udA series of CILs were synthesised from the chiral pool and they were characterised by thermogravimetric analysis, differential scanning calorimetry and spectroscopy. They were then investigated as solvents and catalysts in the Diels-Alder reactions of a series of dienes (cyclopentadiene, isoprene, 2,3-dimethylbuta-1,3-diene, furan, pyrrole, N-methyl pyrrole) and dienophiles (methyl acrylate, methyl vinyl ketone, acrylonitrile, dimethyl maleate, acrolein, dimethylacetylene dicarboxylate, maleic anhydride and maleimide). Investigation of the effect of PILs in the presence of three heterogeneous catalysts Al2O3, SiO2 and K-10 montmorillonite were studied. Ultrasound and microwave-assisted Diels-Alder reactions in the PILs, in the absence and presence of the catalysts, were also studied. The reactions of these prototypical substrates illustrated that the solvents are indeed task-specific.
机译：离子液体（IL）作为试剂和溶剂的使用已得到广泛认可。与常规分子溶剂相比，离子液体具有许多优势。这些优点包括：化学和热稳定性，无可测量的蒸气压，无或更低的毒性，不燃性，催化能力，高极性，并且可以回收。有许多研究小组在研究这种反应介质的各种应用，并且大多数研究集中在衍生自咪唑阳离子的溶剂上。 ud对Diels-Alder反应中基于咪唑的ILs的使用进行了详细的研究和更高的研究。已经报道了与常规方法相比的收率。 IL影响速率，并且观察到有趣的选择性。但是，对IL IL（PIL）的范围和局限性并没有给予太多关注。因此，本论文的重点是合成和应用新型手性PIL，作为Diels-Alder反应的环境友好，任务特定的溶剂。此外，这项研究还寻求其他方法，以消除有毒重金属催化剂的使用，并探索减少Diels-Alder反应能耗的方法。 ud从手性池中合成了一系列CIL，并通过热重分析对其进行了表征。分析，差示扫描量热法和光谱学。然后研究它们在一系列二烯（环戊二烯，异戊二烯，2,3-二甲基丁-1,3-二烯，呋喃，吡咯，N-甲基吡咯）和亲二烯体（丙烯酸甲酯）的Diels-Alder反应中作为溶剂和催化剂的情况。 ，甲基乙烯基酮，丙烯腈，马来酸二甲酯，丙烯醛，二甲酸二甲基乙炔酯，马来酸酐和马来酰亚胺）。研究了在三种非均相催化剂Al2O3，SiO2和K-10蒙脱土存在下PIL的作用。还研究了在不存在和存在催化剂的情况下，PIL中的超声和微波辅助Diels-Alder反应。这些原型底物的反应表明，溶剂确实是特定任务的。

著录项

  • 作者

    Yu Jianguo;

  • 作者单位
  • 年度 2009
  • 总页数
  • 原文格式 PDF
  • 正文语种 en
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号