...
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Novel imidazolium and imidazolinium salts containing the 9-nickelafluorenyl anion - synthesis, structures and reactivity
【24h】

Novel imidazolium and imidazolinium salts containing the 9-nickelafluorenyl anion - synthesis, structures and reactivity

机译:新型的咪唑鎓和咪唑啉鎓盐,含9-尼克芴基阴离子-合成,结构和反应活性

获取原文
获取原文并翻译 | 示例
           

摘要

Investigation of the properties of carbene complexes is one of the most important fields of modern coordination chemistry. In this paper, we propose the convenient synthesis of NHC-nickel compounds. The 9-nickelafluorenyllithium complex reacts with imidazolium or imidazolinium salts to afford 9-nickelafluorenyl-NHC salts via ionic metathesis with very good yields (66-92%). These compounds can be isomerised at elevated temperatures to give Ni-NHC complexes with excellent yields (88-91%), probably via nickel mediated hydrogen transfer to the biphenyl moiety. In this reaction, the nickelacyclic ring itself serves as a base in the deprotonation of the carbene precursor. DFT calculations show the thermodynamic instability of the synthesized salts, with Gibbs free energy differences for 1 of -84 kJ mol(-1) at 298 K and -167 kJ mol(-1) at 374 K. The obtained salts and carbene complexes are relatively air and moisture stable in the solid state.
机译:卡宾配合物的性质研究是现代配位化学最重要的领域之一。在本文中,我们提出了方便的合成NHC-镍化合物的方法。 9-镍芴基锂络合物与咪唑鎓或咪唑啉鎓盐反应,通过离子复分解以非常好的收率(66-92%)提供9-镍芴基-NHC盐。这些化合物可以在高温下异构化,从而可能通过镍介导的氢转移至联苯部分,从而以极好的收率(88-91%)得到Ni-NHC复合物。在该反应中,镍环环本身在卡宾前体的去质子化中用作碱。 DFT计算显示了合成盐的热力学不稳定性,在298 K时为-84 kJ mol(-1),在374 K时为-167 kJ mol(-1),吉布斯自由能差为:得到的盐和卡宾配合物为空气和湿气在固态时相对稳定。

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