Home About us Contact
|
Home About us Contact | ||
|
|
||
Transfer Hydrogenation Reactions (transfer + hydrogenation_reaction)
Selected AbstractsMixed Donor Aminophosphine Oxide Ligands in Ruthenium-Catalyzed Asymmetric Transfer Hydrogenation Reactions.CHEMINFORM, Issue 43 2004Mohammed S. Rahman Abstract For Abstract see ChemInform Abstract in Full Text. [source] 1,4-Butanediol as a Reducing Agent in Transfer Hydrogenation ReactionsCHEMISTRY - AN ASIAN JOURNAL, Issue 3 2010Hannah Abstract 1,4-Butanediol is able to deliver two equivalents of H2 in hydrogen-transfer reactions to ketones, imines, and alkenes. Unlike simple alcohols, which establish equilibrium in the reduction of ketones, 1,4-butanediol acts essentially irreversibly owing to the formation of butyrolactone, which acts as a thermodynamic sink. It is therefore not necessary to use 1,4-butanediol in great excess in order to achieve reduction reactions. In addition, allylic alcohols are reduced to saturated alcohols through an isomerization/reduction sequence using a ruthenium catalyst with 1,4-butanediol as the reducing agent. Imines and alkenes are also reduced under similar conditions. [source] Chiral amino amides for the ruthenium(II)-catalyzed asymmetric transfer hydrogenation reaction of ketones in waterCHIRALITY, Issue 1 2010Jincheng Mao Abstract The chiral amino amide 3 was derived from L -proline and used for the [RuCl2(p -cymene)]2 -catalyzed asymmetric transfer hydrogenation of prochiral ketones performed in water. Moderate to good chemical selectivities (up to 95% yield) and enantioselectivities (up to 90% ee) were obtained in the presence of 2 mol % of TBAB (n -Bu4NBr) as the phase transfer catalyst. Chirality, 2010. © 2009 Wiley-Liss, Inc. [source] A Palladium Wall Coated Microcapillary Reactor for Use in Continuous Flow Transfer HydrogenationADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2010Christian Abstract Herein we describe the preparation of a novel continuous flow multi-channel microreactor in which the internal surface has been functionalised with a palladium coating, enabling its use in catalytic heterogeneous liquid-phase reactions. Simple chemical deposition techniques were used to immobilise palladium(0) on the channel wall surface of a polymeric multi-capillary extrudate made from ethylene-vinyl alcohol copolymer. The Pd coating of the microcapillaries has been characterised by mass spectrometry and light and electron microscopy. The functional activity of the catalytic Pd layer was tested in a series of transfer hydrogenation reactions using triethylsilane as the hydrogen source. [source] Ruthenium ONO-Type Pincer Complex: Synthesis, Structural Characterization, and CatalysisADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2010Yao Zhang Abstract A novel nitrone-based pincer ligand was developed by a single-step synthesis from N -(tert -butyl)hydroxylamine acetate and 2,6-pyridinedicarboxaldehyde. The developed ligand allowed us to synthesize a cationic ruthenium pincer complex. A distorted octahedral coordination environment around the ruthenium center was observed. The complex showed excellent catalytic activity in transfer hydrogenation reactions with turnover numbers up to 590,000. [source] New chiral phosphinite ligands with C2 -symmetric axis and their possible applications in Ru-catalyzed asymmetric transfer hydrogenationAPPLIED ORGANOMETALLIC CHEMISTRY, Issue 3 2010Murat Aydemir Abstract The new chiral ligands N,N,-bis-[(1R)-1-ethyl-2- O -(diphenylphosphinite)ethyl]ethanediamide, 1, and N,N,-bis-[(1S)-1-isobutyl-2- O -(diphenylphosphinite)ethyl]ethanediamide, 2, and the corresponding ruthenium complexes 3 and 4 were prepared and their structures were elucidated by a combination of multinuclear NMR spectroscopy, IR spectroscopy and elemental analysis. Following activation by NaOH, these chiral ruthenium complexes serve as catalyst precursors for the asymmetric transfer hydrogenation of acetophenone derivatives in iPrOH. The complexes 3 and 4 showed high catalytic activity but low selectivity in asymmetric transfer hydrogenation reactions. Copyright © 2009 John Wiley & Sons, Ltd. [source] | ||||||||||