Bench-Stable Cobalt Pre-Catalysts for Mild Hydrosilative Reduction of Tertiary Amides to Amines and Beyond
作者:Alibek Nurseiit、Jaysan Janabel、Kristina A. Gudun、Aishabibi Kassymbek、Medet Segizbayev、Tulegen M. Seilkhanov、Andrey Y. Khalimon
DOI:10.1002/cctc.201801605
日期:2019.1.23
unsaturated organic molecules, including the normally challenging reduction of amides to amines. With regard to hydrosilative reduction of amides even more effective and activator free catalytic systems can be generated from the bench‐stable, commercially available Co(acac)2 and Co(OAc)2 with dpephos and PPh3 ligands. These systems operate under mild conditions (<100 °C), with many examples of room temperature
POCN Ni(<scp>ii</scp>) pincer complexes: synthesis, characterization and evaluation of catalytic hydrosilylation and hydroboration activities
作者:Kristina A. Gudun、Medet Segizbayev、Assyl Adamov、Philipp N. Plessow、Konstantin A. Lyssenko、Mannix P. Balanay、Andrey Y. Khalimon
DOI:10.1039/c8dt04854a
日期:——
reactions with HBPin, efficient and mild hydroboration of a variety of carbonyl compounds, including highly chemoselective hydroboration of benzaldehyde in the presence of other common potent reductive functional groups, such as alkenes, alkynes, esters, amides, nitriles, nitro compounds and even ketones, and the first example of base metal catalyzed hydroboration of amides, including mild direct hydroborative
一系列亚氨基次膦酸酯POCN钳制Ni(II)配合物(POCN)NiMe和(POCN)NiL n(BX 4)(L = CH 3 CN,n = 0,1; X = F,Ph,C 6 F 5)已开发出用于烯烃,醛和酮的催化氢化硅烷化和羰基化合物的氢硼化反应。(POCN)NiMe和(POCN)Ni(BF 4)与PhSiH 3和HBPin的化学计量反应表明催化反应通过氢化物中间体(POCN)NiH。关于与HBPin的反应,对各种羰基化合物进行了有效而温和的硼氢化,包括在存在其他常见的强还原性官能团(例如烯烃,炔烃,酯,酰胺,腈,硝基化合物和(POCN)NiMe证明了贱金属催化酰胺加氢硼化的第一个实例,包括将伯酰胺和仲酰胺轻度直接硼氢化还原成硼化胺。
Regiodivergent hydrosilylation, hydrogenation, [2π + 2π]-cycloaddition and C–H borylation using counterion activated earth-abundant metal catalysis
作者:Riaz Agahi、Amy J. Challinor、Joanne Dunne、Jamie H. Docherty、Neil B. Carter、Stephen P. Thomas
DOI:10.1039/c8sc05391j
日期:——
The widespread adoption of earth-abundant metal catalysis lags behind that of the second- and third-row transitionmetals due to the often challenging practical requirements needed to generate the active low oxidation-state catalysts. Here we report the development of a single endogenous activation protocol across five reaction classes using both iron- and cobalt pre-catalysts. This simple catalytic
Cobalt(II) and (I) Complexes of Diphosphine‐Ketone Ligands: Catalytic Activity in Hydrosilylation Reactions
作者:Dide G. A. Verhoeven、Joost Kwakernaak、Maxime A. C. van Wiggen、Martin Lutz、Marc‐Etienne Moret
DOI:10.1002/ejic.201801221
日期:2019.2.7
homogeneously catalyzed by cobalt complexes has gained considerable attention in the last years, aiming at substituting precious metal‐based catalysts. In this study, the catalytic activity of well‐characterized CoII and CoI complexes of the pToldpbp ligand is demonstrated in the hydrosilylation of 1‐octene with phenylsilane. The CoI complex is the better precatalyst for the mentioned reaction under mild conditions