NiCl2·6H2O/tBuOK, for the electrophilically activated hydrosilylation of terminal alkenes with primary silanes. This protocol provides excellent performance under mild reaction conditions: exclusive anti-Markovnikov selectivity, broad functional group tolerance (36 examples), and good scalability (TON = 5500). However, the secondary and tertiarysilanes are not suitable. Mechanistic studies revealed that
我们报告了一种简单有效的镍基催化体系NiCl 2 ·6H 2 O / t BuOK,用于末端烯烃与伯硅烷的亲电子活化氢化硅烷化。该方案在温和的反应条件下具有出色的性能:独特的抗马尔科夫尼科夫选择性,宽泛的官能团耐受性(36个示例)和良好的可扩展性(TON = 5500)。但是,仲和叔硅烷是不合适的。机理研究表明,这种均相催化的硅氢加成反应包括一种亲电子活化的Si-H键过程,而不会产生氢化镍。
Amine-Activated Iron Catalysis: Air- and Moisture-Stable Alkene and Alkyne Hydrofunctionalization
作者:Amy J. Challinor、Marc Calin、Gary S. Nichol、Neil B. Carter、Stephen P. Thomas
DOI:10.1002/adsc.201600570
日期:2016.7.28
an air‐ and moisture‐stable iron(II) pre‐catalyst for alkene and alkyne hydrofunctionalization reactions. This amine activation has enabled the highly operationally simple hydrosilylation and hydroboration of alkenes and alkynes using just 0.25–2 mol% iron catalyst and 1–25 mol% amine. Significantly, these reactions proceed in equal yield under both air and inert reaction conditions.
Activation of Ene-Diamido Samarium Methoxide with Hydrosilane for Selectively Catalytic Hydrosilylation of Alkenes and Polymerization of Styrene: an Experimental and Theoretical Mechanistic Study
作者:Jianfeng Li、Chaoyue Zhao、Jinxi Liu、Hanmin Huang、Fengxin Wang、Xiufang Xu、Chunming Cui
DOI:10.1021/acs.inorgchem.6b01670
日期:2016.9.6
syndiospecific polymerization of styrene upon activation with phenylsilane and regioselectivehydrosilylation of styrenes and nonactivated terminal alkenes. Unprecedented regioselectivity (>99.0%) for both types of alkenes has been achieved with the formation of Markovnikov and anti-Markovnikov products in high yields, respectively, whereas the polymerization of styrene resulted in the formation of syndiotactic
掺有烯二酰胺配体L(DME)Sm(μ-OMe)2 Sm(DME)L(1 ; L = [DipNC(Me)C(Me)NDip] 2–的二甲基,Dip = 2,6- i(Pr 2 C 6 H 3和DME = 1,2-二甲氧基乙烷)已经被制备并在结构上表征。综合大楼1苯硅烷活化和苯乙烯与非活化末端烯烃的区域选择性氢化硅烷化反应催化苯乙烯的间同特异性聚合。分别以高收率形成Markovnikov和抗Markovnikov产物,实现了两种烯烃前所未有的区域选择性(> 99.0%),而苯乙烯的聚合导致间同立构的甲硅烷基封端的低聚苯乙烯的形成。动力学实验和密度泛函理论计算有力地支持了由Sm–OMe键1与PhSiH 3的σ键复分解生成的氢化mar中间体。。另外,观察到的用于氢化硅烷化和聚合的区域选择性与计算的能量分布一致,这表明庞大的烯-二叠氮配体和氢化sa中间体对于区域和立体选择性具有重要作用。
Rare earth alkyl and hydride complexes bearing silylene-linked cyclopentadienyl-phosphido ligands. Synthesis, structures, and catalysis in olefin hydrosilylation and ethylene polymerization
作者:Olivier Tardif、Masayoshi Nishiura、Zhaomin Hou
DOI:10.1016/j.tet.2003.07.015
日期:2003.12
cyclopentadienyl-phosphido rareearthalkyl and hydride complexes of type Me2Si(C5Me4)(PR′)LnR (Ln=Y, Yb, Lu; R′=Ph, Cy, C6H2tBu3-2,4,6; R=CH2SiMe3, H) have been synthesized and structurally characterized, and their activity in ethylene polymerization and olefin hydrosilylation has been studied. These complexes represent the first examples of rareearthalkyl and hydride complexesbearing cyclopentadienyl-phosphido
Me 2 Si(C 5 Me 4)(PR')LnR(Ln = Y,Yb,Lu; R'= Ph,Cy,C 6 H合成了2 t Bu 3 -2,4,6; R = CH 2 SiMe 3,H)并对其结构进行了表征,并研究了它们在乙烯聚合和烯烃氢化硅烷化中的活性。这些配合物代表了带有环戊二烯基-磷基配体的稀土烷基和氢化物配合物的第一个例子,它们在结构和化学上都与类似的环戊二烯基-酰胺基和茂金属配合物形成鲜明对比。
Cobalt Catalysts for Alkene Hydrosilylation under Aerobic Conditions without Dry Solvents or Additives
Program Severo Ochoa SEV-2016-0683 is gratefully acknowledged. S. G. T. and P. O.-B. thank MINECO for a FPU Ph.D. fellowship FPU16/02117 and a Ramon y Cajal contract RYC-2014-16620, respectively. Authors would like to thank Prof. Avelino Corma for discussion on the work and support. Authors would like to thank Ms. Adelina Munoz, Dr. Alejandro Vidal, and Ms. Carmen Clemente for the Raman, EPR, and ESI-MS
非常感谢计划 Severo Ochoa SEV-2016-0683。SGT 和 PO-B。感谢 MINECO 获得 FPU 博士学位。分别获得 FPU16/02117 奖学金和 Ramon y Cajal 合同 RYC-2014-16620。作者要感谢 Avelino Corma 教授对工作的讨论和支持。作者要感谢 Adelina Munoz 女士、Alejandro Vidal 博士和 Carmen Clemente 女士分别进行的拉曼、EPR 和 ESI-MS 测量。作者还感谢使用 RIAIDT(圣地亚哥德孔波斯特拉大学)的 X 射线单元的分析设施。