General and selective reductive amination of carbonyl compounds using a core–shell structured Co<sub>3</sub>O<sub>4</sub>/NGr@C catalyst
作者:Tobias Stemmler、Felix A. Westerhaus、Annette-Enrica Surkus、Marga-Martina Pohl、Kathrin Junge、Matthias Beller
DOI:10.1039/c4gc00536h
日期:——
The application of heterogenized non-noble metal-based catalysts in selective catalytic hydrogenation processes is still challenging. In this respect, the preparation of a well-defined cobalt-based catalyst was investigated by immobilization of the corresponding cobalt(II)-phenanthroline-chelate on Vulcan XC72R carbon powder. The formed coreâshell structured cobalt/cobalt oxide nanocomposites are encapsulated by nitrogen-enriched graphene layers. This promising cheap heterogeneous catalyst allows for an efficient domino reductive amination of carbonyl compounds with nitroarenes.
Heterometallic catalysis: Three different Mg/Ba hydride clusters have been prepared and were studied in the solid state and in solution. Cooperative effects between Mg and Ba in hydrogenation catalysis have been evaluated.
异金属催化:已经制备了三种不同的 Mg/Ba 氢化物簇,并在固态和溶液中进行了研究。已经评估了 Mg 和 Ba 在加氢催化中的协同作用。
The Versatility of the Aryne–Imine–Aryne Coupling for the Synthesis of Acridinium Photocatalysts
作者:Christof Sparr、Valeriia Hutskalova
DOI:10.1055/s-0040-1720349
日期:2022.7
and efficient synthesis of distinct catalyst structures. Herein, we report our exploration of the scope of the aryne–imine–aryne coupling reaction combined with a subsequent acridane oxidation for a short two-step approach towards various acridinium salts. The photophysical properties of the novel photocatalysts were investigated and the practical value was demonstrated by a cation-radical accelerated
followed by the subsequent oxidation of the acridane intermediates. Herein, we now present an unusual reaction outcome when phenanthryne is used as aryne component. Under optimized conditions, this two-step synthetic methodology led to the formation of a helical tetrabenzophenanthridinium derivative. Furthermore, the susceptibility of this product to photoinduced cyclodehydrogenation was observed, providing
作者:Merle Arrowsmith、Michael S. Hill、Gabriele Kociok-Köhn
DOI:10.1002/chem.201203190
日期:2013.2.18
The β‐diketiminato magnesium alkyl complex [LMgnBu] (L=CHCMe(NDipp)}2, Dipp=diisopropylphenyl) is shown to be a highly effective precatalyst for the hydroboration of alkyl and aryl substituted aldimines and ketimines with pinacol borane (HBpin). Catalysis is proposed to occur through a sequence of MgN/BH metathesis and rate‐determining MgH/NC insertion steps, a proposal strongly supported by stoichiometric
已显示β-二酮基亚氨基镁烷基络合物[LMg n Bu](L = CH CMe(NDipp)} 2,Dipp =二异丙基苯基)是高效的催化剂,用于频哪醇硼烷对烷基和芳基取代的亚胺和酮亚胺进行氢硼化(HBpin)。催化提出通过Mg的顺序发生 N / B ħ复分解和速度确定的Mg H /NC插入步骤,这一建议得到化学计量研究和动力学分析的大力支持。可以观察到反应是通过定义明确的酰胺酰胺进行的,其中有两个例子已被分离并进行了结构表征。机理研究表明,催化速率确定过程发生在一个孤立的镁中心,需要两个分子的亚胺底物才能有效转换。后者的观察结果被合理地认为是辅助底物分子将HBpin从催化镁中心的配位域置换出来的要求。