Arrested B–H Activation en Route to Installation of a PBP Pincer Ligand on Ruthenium and Osmium
摘要:
The reaction of HB(NCH2PPh2)(2)C6H4-1,2 with [MCl2(PPh3)(3)] (M = Ru, Os) affords the six-coordinate alpha-borane complexes [MCl2(PPh3){sigma-BH-kappa(2)-P,P'-HB-(NCH2PPh2)(2)-C6H4}], in which the B-H bond remains intact while coordinated to the metal center. Replacement of the unique phosphine by pi-acceptor ligands, e.g., CO and CNC6H2Me3, induces B-H activation followed by spontaneous dehydrochlorination with the formation of the boryl pincer complexes (RuCl(CA)(2)({B(NCH2PPh2)(2)C6H4}] (A = O, NC6H2Me3-2,4,6).
Synthesis and reactivity of osmium and ruthenium PBP–LXL boryl pincer complexes
作者:Caitlin M.A. McQueen、Anthony F. Hill、Manab Sharma、Suprita K. Singh、Jas S. Ward、Anthony C. Willis、Rowan D. Young
DOI:10.1016/j.poly.2016.05.041
日期:2016.12
pincer complex [OsCl(CO)(PPh3)B(NCH2PPh2)2C6H4}]. This complex, and its ruthenium analogue were observed to undergo various reactions involving substitution of the chloride and triphenylphosphine co-ligands to give newcomplexes [MCl(CO)(CNC6H2Me3)B(NCH2PPh2)2C6H4}] (M = Ru, Os), [MH(CO)(PPh3)B(NCH2PPh2)2C6H4}] (M = Ru, Os) and [Ru(κ2-S,S′-S2CNEt2)(CO)B(NCH2PPh2)2C6H4}]. The rutheniumcomplex [Ru
A Ni
<sup>0</sup>
σ‐Borane Complex Bearing a Rigid Bidentate Borane/Phosphine Ligand: Boryl Complex Formation by Oxidative Dehydrochloroborylation and Catalytic Activity for Ethylene Polymerization
作者:Falk William Seidel、Kyoko Nozaki
DOI:10.1002/anie.202111691
日期:2022.2
The synthesis of a rigid bidentate borane/phosphine ligand was explored within the background of statistical olefin copolymerization with group 10 metals. During this work, a mild oxidative dehydrochloroborylation reaction was found to convert different Ni0 σ-borane complexes into NiII boryl chloride complexes. This new ligand also allows the nickel catalyzed polymerization of ethylene, a first for
在统计烯烃与第 10 族金属共聚的背景下,探索了刚性二齿硼烷/膦配体的合成。在这项工作中,发现温和的氧化脱氯硼酸化反应可将不同的 Ni 0 σ-硼烷配合物转化为 Ni II氯化硼配合物。这种新的配体还允许乙烯的镍催化聚合,这是第 10 族烯烃聚合中的第一个 B 供体。
reversibly with a second equivalent of H2 (1 atm) and serves as an olefin hydrogenation catalyst under mild conditions (room temperature, 1 atm H2). A bimetallic Co species is invoked in the rate-determining step of the catalysis according to kinetic studies. A structurally related Ni(I)Ni(I) dimer, [((Ph)PBP)Ni]2 (3), has also been prepared. Like Cocatalyst1, Ni complex 3 displays reversible reactivity toward
产生有效促进贵金属催化剂更典型的双电子还原转化(例如,氢化)的后第一行金属催化剂的新方法是一个重要目标。在这里,我们描述了结构上不寻常的 S = 1 双金属 Co 配合物 [((Cy)PBP)CoH]2 (1) 的合成,由双(膦基)硼基和双(膦基)氢化硼烷配体支持。该配合物与第二当量的 H2 (1 atm) 发生可逆反应,并在温和条件下(室温,1 atm H2)用作烯烃加氢催化剂。根据动力学研究,在催化的速率确定步骤中调用双金属 Co 物种。还制备了结构相关的 Ni(I)Ni(I) 二聚体 [((Ph)PBP)Ni]2 (3)。与 Co 催化剂 1 一样,Ni 配合物 3 显示出对 H2 的可逆反应性,得到双金属配合物 [((Ph)PBHP)NiH]2 (4)。这种可逆行为对于 Ni(I) 物种来说是前所未有的,这归因于硼基-Ni 键的存在。最后,制备了一系列单体 ((tBu)PBP)NiX
An Effective Osmium Precatalyst for Practical Synthesis of Diarylketones: Preparation, Reactivity, and Catalytic Application of [OsH-<i>cis</i>-(CO)<sub>2</sub>-<i>mer</i>-{κ<sup>3</sup>-<i>P</i>,<i>B</i>,<i>P</i>′-B(NCH<sub>2</sub>PPh<sub>2</sub>)<sub>2</sub>-<i>o</i>-C<sub>6</sub>H<sub>4</sub>}]
作者:Fei Fang、Jiarui Chang、Jie Zhang、Xuenian Chen
DOI:10.1021/acs.organomet.1c00533
日期:2021.11.22
give diaryl ketones in good to excellent yields. It was demonstrated that the reactions were catalyzed by in situgenerated osmium nanoparticles. This work would open an avenue of heterogeneous transition metal catalyst system for the synthesis of diarylketones via the couplingreactions between arylboronic acids and aryl aldehydes, which has never been reported before.
开发通过实用程序从市售廉价底物有效合成二芳基酮的新方法是非常可取的。在这项工作中,基于新合成的 Os PBP 钳形复合物 [OsH- cis -(CO) 2 - mer -κ 3 - P , B , P '-B(NCH 2 PPh 2 ) 2 - o -C 6 H 4 }] ( 1 )。复合物1被证明在室温下对许多试剂非常稳定;CS2在升高的温度下只能与1反应生成 [Os(κ 2 - S,S' -S 2 CH)(CO) -mer -κ 3 - P , B , P '-B(NCH 2 PPh 2 ) 2 - o -C 6 H 4 }] ( 2 )。发现配合物1是芳基硼酸和芳基醛之间偶联反应的有效预催化剂。在K 3 PO存在的情况下,反应可以耐受许多官能团并在甲苯中顺利进行4和 H 2 O 在 100 °C 空气气氛下得到二芳基酮,收率良好至极好。结果表明,反应是由原位生成的锇纳米颗粒催化
Bimetallic Complexes of Group 8, 9, and 11 Metals Bridged by RB(NCH
<sub>2</sub>
PPh
<sub>2</sub>
)
<sub>2</sub>
C
<sub>6</sub>
H
<sub>4</sub>
(R = H, 4‐C
<sub>6</sub>
H
<sub>4</sub>
X; X = H, Me, F) Ligands
作者:Simon Sung、Angelina Ang、Anthony F. Hill、Chenxi Ma、Richard Y. Kong、Jas S. Ward、Rowan D. Young
DOI:10.1002/ejic.201800448
日期:2018.6.29
This work was supported by the National University of Singapore, the Singapore Ministry of Education (WBS R-143-000-586- 112), and the Australian Research Council (DP110101611).