...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Sterically hindered phosphine and phosphonium-based activators and additives for olefin polymerization
【24h】

Sterically hindered phosphine and phosphonium-based activators and additives for olefin polymerization

机译：受阻位膦和phospho基活化剂以及用于烯烃聚合的添加剂

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 ability of phosphonium borates of the form [R3PH][B(C6F5)(4)], R2PHC6F4BF(C6F5)(2) and R2PHC4H8OB(C6F5)(3) as well as the phosphine-boranes R2PC6F4B(C6F5)(2) to activate CpTiMe2(NPtBu3) for olefin polymerization was examined via both stoichiometric reactions and catalytic performance. In general these activators resulted in highly active ethylene polymerization catalysts, despite the generation of liberated phosphine donors. Independent experiments in which phosphines were added to the catalyst systems revealed the expected decrease in activity for small phosphines. However in the case of sterically encumbered phosphines, a marked increase in activity was observed. The cause of this increase is considered in the context of the concept of "frustrated Lewis pairs".
机译：形式为[R3PH] [B（C6F5）（4）]，R2PHC6F4BF（C6F5）（2）和R2PHC4H8OB（C6F5）（3）的硼化phospho以及膦硼烷R2PC6F4B（C6F5）（2）的能力通过化学计量反应和催化性能研究了活化CpTiMe2（NPtBu3）进行烯烃聚合的方法。通常，尽管生成了游离的膦供体，但这些活化剂仍能产生高活性的乙烯聚合催化剂。将膦添加到催化剂体系中的独立实验表明，预期的小膦活性降低。然而，在空间受限的膦的情况下，观察到活性显着增加。在“沮丧的刘易斯对”概念的背景下考虑了这种增加的原因。

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