Cobalt‐Catalyzed Deoxygenative Hydroboration of Nitro Compounds and Applications to One‐Pot Synthesis of Aldimines and Amides
作者:Kristina A. Gudun、Raikhan Zakarina、Medet Segizbayev、Davit Hayrapetyan、Ainur Slamova、Andrey Y. Khalimon
DOI:10.1002/adsc.202101043
日期:2022.2
The commercially available and bench-stable Co(acac)2 ligated with bis[(2-diphenylphosphino)phenyl] ether (dpephos) was employed for selective room temperature hydroboration of nitro compounds with HBPin (TOF up to 4615 h−1), tolerating halide, hydroxy, amino, ether, ester, lactone, amide and heteroaromatic functionalities. These reactions offered a direct access to a variety of N-borylamines RN(H)BPin
Lanthanides Mediated Oxidative Cross Coupling of Benzylalcohol and Various Amines to Form Corresponding Imines
作者:Jayeeta Bhattacharjee、Mitali Sachdeva、Tarun K. Panda
DOI:10.1002/zaac.201600201
日期:2016.8
towards the oxidative cross-coupling of benzylalcohol and various aromatic amines to form corresponding imines with high degree conversion (>80 %) and chemo-selectivity using lanthanide salts as pre-catalysts is presented. The catalyzed oxidative cross-coupling reaction using La(NO3)3·6H2O as pre-catalyst displayed a broad substrate scope. The reaction afforded various substituted imines from the reaction
Highly Active Ni Nanoparticles on N‐doped Mesoporous Carbon with Tunable Selectivity for the One‐Pot Transfer Hydroalkylation of Nitroarenes with EtOH in the Absence of H
<sub>2</sub>
Ni/NC-650 catalyst achieved complete conversion of various nitroarenes, yielding imines, secondary amines, or tertiary amines selectively by simply controlling the reaction temperature at 180, 200 and 240 °C, respectively. The one-pot hydrogen-free process with non-noble metal catalysts, as demonstrated in this work, shows great promise for selective conversion of nitroarenes with ethanol to various anilines
将硝基芳烃以经济高效且环保的方式转化为增值产品是可取的,但仍具有挑战性。在这项工作中,通过新型离子交换热解策略合成了负载在 N 掺杂介孔碳 (Ni/NC-x) 上的高度分散的 Ni 纳米粒子 (NPs) 。研究了它们在没有 H 2 的情况下用 EtOH 对硝基苯 (NB) 进行一锅转移加氢烷基化反应的催化性能. 有趣的是,通过改变热解温度来调节 Ni NPs 的形态和电子状态,可以很容易地控制催化性能。发现 Ni/NC-650 实现了 100% 的硝基苯转化率和约 100% 的硝基苯转化率。N,N-二乙基苯胺在 240 °C 下 5 小时的选择性为 90 %,比均相催化剂或通过浸渍制备的负载型 Ni 催化剂(Ni/NC-650-IM、Ni/SiO 2)的活性更高)。这可以归因于催化剂具有更高的分散性和更好的还原性以及更丰富的表面碱性。更有趣的是,Ni/NC-650催化剂通过简单地将反应温度
Osmium Catalysts for Acceptorless and Base-Free Dehydrogenation of Alcohols and Amines: Unusual Coordination Modes of a BPI Anion
作者:María L. Buil、Miguel A. Esteruelas、M. Pilar Gay、Mar Gómez-Gallego、Antonio I. Nicasio、Enrique Oñate、Alicia Santiago、Miguel A. Sierra
DOI:10.1021/acs.organomet.7b00906
日期:2018.2.26
(11), p-cymene (12)). The electronic structrure and electrochemical properties of the dinuclear complexes were also studied. Complexes 3 and 4 are efficient catalyst precursors for the acceptorless and base-freedehydrogenation of secondary and primary alcohols and cyclic and lineal amines. The primary alcohols afford aldehydes. The amount of H2 released per gram of heterocycle depends upon the presence
已经发现了用于基于有机液体的氢载体脱氢的新型催化剂前体。配合物OSH 6(P i Pr 3)2(1)和OSH(OH)(CO)(P i Pr 3)2(2)与1,3-双(6'-甲基-2'-吡啶基氨基)异吲哚啉反应(HBMePI),得到OSH 3 κ 2 -N吡啶,N亚胺- (BMePI)}(P我镨3)2(3)和职业安全与卫生κ 2 -N吡啶,N亚胺-(BMePI)}(CO)(P i Pr 3)2(4)。前所未有的κ 2 -N吡啶,N亚胺BMePI的协调模式热力学与锇(IV)和OS(II)的金属碎片优选和允许制备基于BMePI-双核金属阳离子。在KO t Bu存在下,用0.5当量的HBMePI处理OSH 2 Cl 2(P i Pr 3)2(5),得到双OS IV型双核阳离子的氯化物盐[OSH 3(P i Pr 3)2} 2 μ-(κ 2 -N吡啶,N亚胺)2 -BMePI}] +(6)。
Recyclable cobalt(0) nanoparticle catalysts for hydrogenations
作者:Philipp Büschelberger、Efrain Reyes-Rodriguez、Christian Schöttle、Jens Treptow、Claus Feldmann、Axel Jacobi von Wangelin、Robert Wolf
DOI:10.1039/c8cy00595h
日期:——
The search for new hydrogenationcatalysts that replace noble metals is largely driven by sustainability concerns and the distinct mechanistic features of 3d transition metals. Several combinations of cobalt precursors and specific ligands in the presence of reductants or under high-thermal conditions were reported to provide activehydrogenationcatalysts. This study reports a new method of preparation
寻找替代贵金属的新型加氢催化剂的主要原因是对可持续性的关注以及3d过渡金属的独特机械特性。据报道,在还原剂存在下或在高温条件下,钴前体和特定配体的几种组合可提供活性加氢催化剂。这项研究报告了一种在不存在配体或表面活性剂的情况下通过还原商业CoCl 2制备小的单分散Co(0)纳米颗粒(3-4 nm)的新方法。在烯烃,炔烃,亚胺和杂芳烃(2–20 bar H 2)的氢化中观察到高催化活性。磁性使催化剂分离和多次回收成为可能。