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13 November 2020

preparation of nitroarenes

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Prepared catalyst was characterized by BET‐surface area, Inductively coupled plasma atomic emission spectroscopy (ICP‐AES), X‐ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Temperature programmed reduction (TPR), X‐ray photoelectron spectroscopy (XPS), Fourier transform infra‐red (FT‐IR) spectroscopy, RAMAN spectroscopy, Thermogravimetric analysis (TGA‐DTA), UV‐vis spectroscopy and Extended X‐ray absorption fine structure (EXAFS) analysis. stliu@ntu.edu.tw Synthesis and Characterization of Rh . Such materials are peer reviewed and may be re‐organized for online delivery, but are not copy‐edited or typeset. Then, we explored the possibility to access more diverse substituted pyrroles using commercially available 2,5‐diketones (Scheme 3). To better understand the mechanism of the cobalt‐catalyzed pyrrole formation under WGSR conditions, control experiments have been performed. Impregnated Ruthenium on Magnetite as a Recyclable Catalyst for the N-Alkylation of Amines, Sulfonamides, Sulfinamides, and Nitroarenes Using Alcohols as Electrophiles by a Hydrogen Autotransfer Process. Next, we explored the applicability of Co/NGr‐C@SiO2‐L in the synthesis of pyrroles from various nitroarenes, including substrates with sensitive functional groups (Scheme 2). Intermetallic Ni [a] newly reported compound. Dr. Dario Formenti, Johannes Fessler for valuable discussions and David K. Leonard (all at LIKAT) for his help in the preparation of this article. In addition, reductive aminations to prepare a wide variety of amines were realized.11 Apart from such basic C−N bond forming reactions, the synthesis of important N‐heterocycles has been explored to a lesser extent. Rice husk-SiO present a method that links the carbon in an olefin to the nitrogen in a nitroaromatic compound (see the Perspective by Kürti). . Reaction conditions: 0.5 mmol nitroarene, 0.6 mmol 2,5‐diketone, 40 mg catalyst, 40 bar H2, 120 °C, 24 hours; 0.8 mL THF; [a] newly reported compound; [b] aniline 3 80 % yield. Interestingly, formic acid not only serves as a hydrogen donor, but also has a positive impact on the rate of the Paal–Knorr pyrrole synthesis. Specifically, substrates containing basic nitrogen atoms (28–30) were not suitable for this protocol using H2 as a reductant. . The catalyst was synthesized by a single step hydrothermal method using CTAB (cetyltrimethyl ammonium bromide) as a structure‐ directing agent and PVP (Polyvinylpyrrolidone) as capping agent. Herein, we report a highly efficient protocol for the selective hydrogenation of nitroarenes in neutral H2O using H2 (1 atm) over a heterogeneous Zn(0) catalyst under mild conditions. If you do not receive an email within 10 minutes, your email address may not be registered, Ruthenium‐Catalyzed One‐Pot Aromatic Secondary Amine Formation from Nitroarenes and Alcohols. 2 From Nitrobenzenes to Substituted Tetrahydroquinolines in a Single Step by a Domino Reduction/Imine Formation/Aza-Diels–Alder Reaction. Simple synthetic protocol to obtain 3d-4f-heterometallic carboxylate complexes of N-heterocyclic carbenes. Ruthenium-catalyzed direct amination of alcohols with tertiary amines. In 2016 Kempe and co‐workers reported a cobalt‐based nanocatalyst for the preparation of benzimidazoles from nitroarenes and aldehydes.12 This pioneering work sparked the development of other 3d‐metal catalysts for the synthesis of various N‐heterocycles from nitroarenes.13 Among the different heterocycles, pyrroles are an important class of compounds with useful biological and physical properties. contained in this article in third party publications An Effective Method To Prepare Imines from Aldehyde, Bromide/Epoxide, and Aqueous Ammonia. XX is the XXth reference in the list of references. Convenient Synthesis of Quinolines from α‐2‐Nitroaryl Alcohols and Alcohols via a Ruthenium‐catalyzed Hydrogen Transfer Strategy. o Reaction conditions: 0.5 mmol nitroarene, 40 mg catalyst, 40 bar H2, 120 °C, 24 hours; 0.8 mL DMTHF or 0.8 mL 2,5‐hexanedione. Preparation of Imines by Oxidative Coupling of Benzyl Alcohols with Amines Catalysed by Dicopper Complexes. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Various secondary amines were obtained selectively from the reaction of nitroarenes with primary alcohols in the presence of ruthenium ( II) complexes having phosphine - amine ligands as the catalyst. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. China, School of Chemistry and Environmental Engineering, Shandong University of Science and Technology No. Chiral Palladacycles with N-Heterocyclic Carbene Ligands as Catalysts for Asymmetric Hydrophosphination. Learn about our remote access options, Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, 12071‐Castellón (Spain), Fax: (+34) 964‐728‐214. 2 it in a third party non-RSC publication you must Si/SiCN as a highly efficient catalyst for the one-pot tandem synthesis of imines and secondary amines Dinuclear Tetrapyrazolyl Palladium Complexes Exhibiting Facile Tandem Transfer Hydrogenation/Suzuki Coupling Reaction of Fluoroarylketone. . Iron-Catalyzed In the presence of 1.8 mol % Co/NGr‐C@SiO2‐L under solvent‐free conditions, the starting nitroarenes were converted to their corresponding N‐phenylpyrroles. Tandem Suzuki–Miyaura/transfer hydrogenation reaction catalyzed by a Pd–Ru complex bearing an anionic dicarbene. Due to the intrinsic advantages, interesting developments applying homogeneous organometallic complexes or organo‐catalysts have been achieved.3, 4 On the other hand, heterogeneous catalytic materials are scarcely known in this area despite their advantageous recyclability, separation, and stability.5, 6, In the past decade, significant progress in base‐metal catalysis for redox transformations has been observed.7 In particular, metal‐nitrogen‐carbon (3d‐M/N/C) catalysts prepared by pyrolysis of supported molecularly‐defined complexes or immobilized MOFs have been widely applied for organic transformations and energy storage applications. Heterobimetallic Iridium–Ruthenium Assemblies through an Ambidentate Triazole-Diylidene Ligand: Electrochemical Properties and Catalytic Behavior in a Cascade Reaction. For reproduction of material from all other RSC journals and books: For reproduction of material from all other RSC journals. Smart N-Heterocyclic Carbene Ligands in Catalysis. As an example, the enantioselective synthesis of (+)‐Isamoltane is reported.

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