• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >A Study of the Influence of Ionic Liquids Properties on the Kemp Elimination Reaction
【24h】

A Study of the Influence of Ionic Liquids Properties on the Kemp Elimination Reaction

机译：离子液体性质对消除Kemp反应的影响研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The morpholino-induced elimination of 5-nitrobenzisoxazole into the relevant 2-cyano-4-nitrophenolate has been used as a sample reaction in order to investigate molecular properties of some room temperature ionic liquids. The kinetic study was carried out at 298 K by means of spectrophotometric measurements. Ionic liquids, which differ in both their cation and anion properties, were used as solvent systems. In particular, aliphatic (pyrrolidinium, piperidinium, and ammonium) and aromatic (imidazolium and pyridinium) ionic liquids were sed. For aromatic cations, imidazolium ions having different hydrogen-bond donor ability or a different alkyl-chain length were taken into account. The anions chosen ([BF_4~-], [PF_6~-], [SbF_6~-], and[NTf_2~-]; where NTf_2=bis(trifluoromethansulfonyl)imide) showed different shape, size, and coordination ability. Solvent parameters of all ionic liquids used were determined by using spectroscopic probes, such as 4-nitroaniline, N,N-diethyl-4-nitroaniline, Nile Red, and Reichardt-s dye. Finally, in order to obtain information on the structural organization of the solvent systems, resonance light-scattering measurements were carried out. The collected data provide evidence that onic liquids are solvent media which exhibit peculiar features, whose effects can be ationalized only considering all parameters affecting their three-dimensional structure.
机译：为了研究某些室温离子液体的分子特性，已将吗啉代诱导的5-硝基苯并恶唑消除为相关的2-氰基-4-硝基苯酚盐作为样品反应。动力学研究是通过分光光度法在298 K下进行的。阳离子和阴离子性质不同的离子液体被用作溶剂体系。特别是，对脂肪族（吡咯烷鎓，哌啶鎓和铵）和芳香族（咪唑鎓和吡啶鎓）离子液体进行了沉淀。对于芳族阳离子，考虑具有不同氢键供体能力或不同烷基链长度的咪唑鎓离子。所选择的阴离子（[BF_4〜-]，[PF_6〜-]，[SbF_6〜-]和[NTf_2〜-];其中NTf_2 =双（三氟甲磺酰基）酰亚胺）显示出不同的形状，大小和配位能力。使用诸如4-硝基苯胺，N，N-二乙基-4-硝基苯胺，尼罗红和Reichardt-s染料之类的光谱探针确定所使用的所有离子液体的溶剂参数。最后，为了获得有关溶剂系统的结构组织的信息，进行了共振光散射测量。收集到的数据提供了证据，表明离子液体是具有特殊特征的溶剂介质，仅考虑所有影响其三维结构的参数，才能对离子液体的作用进行规范化处理。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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