–M Synthesis of biaryls via the Suzuki–Miyaura coupling (SMC) reaction using nitroarenes as an electrophilic coupling partners is described. Ruthenium Complexes with an Anthyridine‐based Ligand. Efficient synthesis of quinoxalines from 2-nitroanilines and vicinal diols via a ruthenium-catalyzed hydrogen transfer strategy. /Au B) Preparation and structural representation of the catalysts. We also thank Susann Buchholz, Dr. Christine Fischer, Susanne Schareina and Gudrun Wenzel for their excellent analytical service; Dr. Nils Rockstroh for the TEM analysis of cobalt catalysts (LIKAT analytical department). Coordination Singularities of a Bis( formally request permission using Copyright Clearance Center. . Bi- and tri-metallic Rh and Ir complexes containing click derived bis- and tris-(pyrazolyl-1,2,3-triazolyl) N–N′ donor ligands and their application as catalysts for the dihydroalkoxylation of alkynes. The general synthetic utility of this methodology was demonstrated on a variety of functionalized substrates including the preparation of biologically active and pharmaceutically relevant compounds, for example, (+)‐Isamoltane. Tandem Suzuki–Miyaura/transfer hydrogenation reaction catalyzed by a Pd–Ru complex bearing an anionic dicarbene. =0.047 bar), with no H2 being present (Figure S5). In addition to the favorable step economy, this straightforward domino process does not require any solvents or external co‐catalysts. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Generation of cobalt hydride species using H2, HCOOH and CO/H2O. Superior activity of 4.9% Ni‐ZrO2 was due to presence of very small (below 5 nm), uniformly distributed, highly dispersed nickel nanoparticle having good metal‐support interaction. While Chung demonstrated the principal feasibility of using CO/H2O as a hydrogen source in a single example using a Co2Rh2/C catalyst,23 Guerrero‐Ríos and co‐workers used formic acid as a reductant in the presence of stabilized rhodium nanoparticles in ionic liquids (two examples).24 In fact, only the Zhang group developed a general catalyst for the reaction of nitroarenes with formic acid to give pyrroles.25 To the best of our knowledge, only one report (one example) for such transformations using H2 is known, which is based on Pt and Pd as noble metals.26. Go to our Preparation of secondary and tertiary amines from nitroarenes and alcohols. Si/SiCN as a highly efficient catalyst for the one-pot tandem synthesis of imines and secondary amines Y-Shaped Tris-N-Heterocyclic-Carbene Ligand for the Preparation of Multifunctional Catalysts of Iridium, Rhodium, and Palladium. I 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. Synthesis of 2,5‐disubstituted pyrroles from nitroarenes. 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. Synthesis of biologically active pyrroles on gram scale. One-pot imine synthesis from benzylic alcohols and nitrobenzene on CdS-sensitized TiO2 photocatalysts: Effects of the electric nature of the substituent and solvents on the photocatalytic activity. Treatment of 48 with hydrazine hydrate in boiling ethanol gave 49 in quantitative yield. In all cases the Ref. . I I To better understand the mechanism of the cobalt‐catalyzed pyrrole formation under WGSR conditions, control experiments have been performed. 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. Facile Preparation of Homo‐ and Hetero‐Dimetallic Complexes with a 4‐Phosphino‐Substituted NHC Ligand. Preparation of secondary and tertiary amines from nitroarenes and alcohols. 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. formally request permission using Copyright Clearance Center. Highly active and selective synthesis of imines from alcohols and amines or nitroarenes catalyzed by Pd/DNA in water with dehydrogenation. it in a third party non-RSC publication you must (M = Pt, Pd) Heterobimetallic Complexes Based on a Bisphosphine Ligand: Tandem Reactions Using Ethanol wangbo@hainanu.edu.cn, bowang2@kth.se, b As an example, the in situ generated cobalt phenanthroline complex was supported on fumed silica, then dried and pyrolyzed at 800 °C for 2 h to give Co/NGr‐C@SiO2. In fact an iron‐based catalyst was shown to operate better in the presence of TEA.35 Thus, the likely scenario for the observed effect does not involve the metal directly; instead we believe that under WGSR conditions TEA facilitates the metal‐hydride formation via base‐assisted activation of H2O to attack the CO. To showcase the synthetic utility of this general cobalt‐catalyzed pyrrole synthesis from nitroarenes, we performed a multistep synthesis of several biologically active and pharmaceutically important lead compounds. 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. Expanding the Scope of Chelating Triazolylidenes: Mesoionic Carbenes from the 1,5‐“Click”‐Regioisomer and Catalytic Synthesis of Secondary Amines from Nitroarenes. Reaction conditions: 0.5 mmol nitroarene, HCOOH/TEA 5:2 mixture (1.75 mmol HCOOH, 0.7 mmol TEA), 40 mg catalyst, 100 °C, 0.8 mL 2,5‐hexanedione, 24 hours. The water‐gas shift reaction (WGSR) of CO and H2O to give H2 and CO2 is an industrially relevant transformation which found its application in the production of methanol, as well as in the Haber‐Bosch and Fischer–Tropsch processes. The key transformation in these cobalt‐catalyzed pyrrole syntheses is the selective reduction of nitroarenes with active cobalt hydride species. Facile Preparation of Homo‐ and Hetero‐Dimetallic Complexes with a 4‐Phosphino‐Substituted NHC Ligand. In/HCl, In/AcOH),21, 22 which is an evident drawback. Heterogeneous Palladium‐Catalyzed Hydrogen‐Transfer Cyclization of Nitroacetophenones with Benzylamines: Access to C−N Bonds. N,N′-Dialkylation Catalyzed by Bimetallic Iridium Complexes Containing a Saturated Bis-N-Heterocyclic Carbene (NHC) Ligand. This acceleration effect, however, is not specific to cobalt metal. Bi- and tri-metallic Rh and Ir complexes containing click derived bis- and tris-(pyrazolyl-1,2,3-triazolyl) N–N′ donor ligands and their application as catalysts for the dihydroalkoxylation of alkynes.