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New Chiral Di N Heterocyclic Carbene Ligands And Their Application In Enantioselective Hydrogenation Hydroformylation And 14 Conjugate Addition Reactions A Study Toward Rational Development Of Di N Heterocyclic Carbene Complexes In Enantioselective Catalysis
Download New Chiral Di N Heterocyclic Carbene Ligands And Their Application In Enantioselective Hydrogenation Hydroformylation And 14 Conjugate Addition Reactions A Study Toward Rational Development Of Di N Heterocyclic Carbene Complexes In Enantioselective Catalysis full books in PDF, epub, and Kindle. Read online New Chiral Di N Heterocyclic Carbene Ligands And Their Application In Enantioselective Hydrogenation Hydroformylation And 14 Conjugate Addition Reactions A Study Toward Rational Development Of Di N Heterocyclic Carbene Complexes In Enantioselective Catalysis ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis New Chiral Di-n-heterocyclic Carbene Ligands and Their Application in Enantioselective Hydrogenation, Hydroformylation and 1,4-conjugate Addition Reactions. a Study Toward Rational Development of Di-n-heterocyclic Carbene Complexes in Enantioselective Catalysis by : Matthew Stephen Jeletic
Download or read book New Chiral Di-n-heterocyclic Carbene Ligands and Their Application in Enantioselective Hydrogenation, Hydroformylation and 1,4-conjugate Addition Reactions. a Study Toward Rational Development of Di-n-heterocyclic Carbene Complexes in Enantioselective Catalysis written by Matthew Stephen Jeletic and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We finally present catalytic hydrogenation, hydrogen transfer, hydrosilylation, hydroformylation and 1,4-conjugate addition reactions. The % e.e. for hydrogenation ranged from 0-10%. for the reactions involving hydrogen. These results are attributable to either reductive elimination of the diNHC from the metal center, high temperatures necessary to achieve reaction conversion, or the inherent flexibility of the DEAM ligands. The Pd(diNHC) complexes achieved better selectivity in 1,4-conjugate addition reactions (0-67% e.e.).
Book Synopsis Chiral Donor-Functionalized N-Heterocyclic Carbenes for Asymmetric Catalytic Applications in Hydrogenation - From Design to Application by : Kai Yang Wan
Download or read book Chiral Donor-Functionalized N-Heterocyclic Carbenes for Asymmetric Catalytic Applications in Hydrogenation - From Design to Application written by Kai Yang Wan and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the synthetic protocol for a new class of enantiopure, primary-amine tethered N-heterocyclic carbene (NHC) ligands is described. The synthesis, coordination chemistry, and applications in catalysis for three ligands from this class with general formula (S,S)/(R,R)-H2N-CHPh-CHPh-NHC (NHC = -NCHCHN(C)R, R = Me, tBu, or Mes) are reported. The imidazolium salt of these ligands can be prepared in high yield and purity from the SN1 reaction between chiral sulfamidates and the corresponding N-substituted imidazoles. The method of coordination of the NHC ligands to metals depends on the acidity of the C-H functional in the imidazolium salts. Silver and copper compounds can be prepared in high yield with the ligand to the metal ratio of 2:1 or 1:1. Ruthenium, iridium, and rhodium complexes can also be prepared via transmetallation from the silver or copper reagents, intramolecular base deprotonation, or C-H oxidative addition. Four ruthenium complexes and two iridium complexes based on these ligands were proven active for ketone hydrogenation, under relatively mild condition (50°C, 25 bar H2(g)). Three half-sandwich ruthenium compounds containing Cp (cyclopentadienyl) or Cp* (1,2,3,4,5-pentamethylcyclopentadienyl) are highly active aryl and alkyl hydrogenation catalysts with TOF (turnover frequency) up to 67 s-1, TON (turnover number) up to 104, and ee (enantiomeric excess) up to 86%. An experimental and computational study of the half-sandwich ruthenium systems suggests that the heterolytic splitting of dihydrogen over the metal-amido bond and hydride transfer from the catalyst to the substrate can both be rate-determining. An alcohol-assisted mechanism was also calculated to explain the rate enhancement when the catalysis was conducted in polar, protic solvents such as 2-PrOH. A full experimental and computational study was also performed for a Fe(P-NH-P') system. Similarly, heterolytic splitting and hydride transfer are the two most energy demanding transition states. In addition, the enantiodetermining step (EDS) of this asymmetric ketone hydrogenation catalyst was calculated, and the origins of enantioselectivity were summarized as steric repulsion, the high compressibility of the backbone, and H-bond contributed stabilization.
Book Synopsis N-heterocyclic Carbene Ligands for Iridium-catalysed Asymmetric Hydrogenation by : Steve Nanchen
Download or read book N-heterocyclic Carbene Ligands for Iridium-catalysed Asymmetric Hydrogenation written by Steve Nanchen and published by Cuvillier Verlag. This book was released on 2005 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Chiral Di-N-heterocyclic Carbene and Hybrid Phosphine-N-heterocyclic Carbene Ligands and Their Application to Transition Metal Mediated Asymmetric Catalysis by :
Download or read book Novel Chiral Di-N-heterocyclic Carbene and Hybrid Phosphine-N-heterocyclic Carbene Ligands and Their Application to Transition Metal Mediated Asymmetric Catalysis written by and published by . This book was released on 2005 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multidentate Di-N-heterocyclic Carbene Ligands for Transition Metal Catalyzed Hydrogenation Reactions by :
Download or read book Multidentate Di-N-heterocyclic Carbene Ligands for Transition Metal Catalyzed Hydrogenation Reactions written by and published by . This book was released on 2015 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Chiral N-heterocyclic Carbene-imine Ligands and Their Application to Asymmetric Catalysis by : Ludovic Grkegoire Bonnet
Download or read book New Chiral N-heterocyclic Carbene-imine Ligands and Their Application to Asymmetric Catalysis written by Ludovic Grkegoire Bonnet and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Artificial Metalloenzymes and MetalloDNAzymes in Catalysis by : Montserrat Diéguez
Download or read book Artificial Metalloenzymes and MetalloDNAzymes in Catalysis written by Montserrat Diéguez and published by John Wiley & Sons. This book was released on 2018-02-21 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important reference for researchers in the field of metal-enzyme hybrid catalysis Artificial Metalloenzymes and MetalloDNAzymes in Catalysis offers a comprehensive review of the most current strategies, developed over recent decades, for the design, synthesis, and optimization of these hybrid catalysts as well as material about their application. The contributors—noted experts in the field—present information on the preparation, characterization, and optimization of artificial metalloenzymes in a timely and authoritative manner. The authors present a thorough examination of this interesting new platform for catalysis that combines the excellent selective recognition/binding properties of enzymes with transition metal catalysts. The text includes information on the various applications of metal-enzyme hybrid catalysts for novel reactions, offers insights into the latest advances in the field, and contains an informative perspective on the future: Explores the development of artificial metalloenzymes, the modern and strongly evolving research field on the verge of industrial application Contains a comprehensive reference to the research area of metal-enzyme hybrid catalysis that has experienced tremendous growth in recent years Includes contributions from leading researchers in the field Shows how this new catalysis combines the selective recognition/binding properties of enzymes with transition metal catalysts Written for catalytic chemists, bioinorganic chemists, biochemists, and organic chemists, Artificial Metalloenzymes and MetalloDNAzymes in Catalysis offers a unique reference to the fundamentals, concepts, applications, and the most recent developments for more efficient and sustainable synthesis.
Book Synopsis N-heterocyclic Carbene Catalysis by : James William Ogle
Download or read book N-heterocyclic Carbene Catalysis written by James William Ogle and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Asymmetric hydrogenation as a general route to polypropionates has been explored for allylic alcohols, acids, and derivatives, which has led to the generation of 2,4-dimethylated hexane derivatives. Quantitative yields in most cases and enantioselectivities greater than 98% were obtained. A remarkable stereofacial inversion was observed when an ester or acid was present in the allylic position instead of an alcohol or alcohol derivative. This led to the construction of all four diastereomers of the hexanol series from a single enantiomer of hydrogenation catalyst. Also described are an attempted synthesis of ( - )-lardolure, a formal synthesis of the methyl ester portion of the preen gland extract from the domestic goose Anser anser, and a total synthesis of an extract from the fungi A. cruciatus. The synthesis of these compounds demonstrated shortcomings of the known catalyst system showing enantioselectivities for polymethylated compounds was high, while diastereoselectivity was low. Methodology to develop new N-heterocyclic carbene catalysts was developed using the cyanide coupling of aldimines to generate electronically tunable 1,3,4,5-tetraaryl complexes, and X-ray, IR, and calculations were used to elucidate their electronic characteristics. These studies indicate that the 4,5-positions have as great an influence on the metal-ligand bond as the 1,3-positions. In addition, they are among the most electron-donating 2- metalated N-heterocyclic carbenes found thus far. An intrinsic relationship between catalytic activity and electron donating ability was found in transfer hydrogenations.
Book Synopsis Chiral N-Heterocyclic Carbene Ligands for Asymmetric Catalysis by : Johannes Diesel
Download or read book Chiral N-Heterocyclic Carbene Ligands for Asymmetric Catalysis written by Johannes Diesel and published by . This book was released on 2019 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: Carbenes ; Asymmetric Catalysis ; C-H Functionalization ; NHC ; Nickel ; Ligand Design.
Book Synopsis Olefin Polymerization by : Walter Kaminsky
Download or read book Olefin Polymerization written by Walter Kaminsky and published by Wiley-VCH. This book was released on 2006-08-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an enormous velocity, olefin polymerization has expanded to one of the most significant fields in polymers since the first industrial use about 50 years ago. In 2005, 100 million tons of polyolefins were produced - the biggest part was catalyzed by metallorganic compounds. The Hamburg Macromolecular Symposium 2005 with the title "Olefin Polymerization" involved topics such as new catalysts and cocatalysts, kinetics, mechanism and polymer reaction engineering, synthesis of special polymers, and characterization of polyolefins. The conference combined scientists from different disciplines to discuss latest research results of polymers and to offer each other the possibility of cooperation. This is reflected in this volume, which contains invited lectures and selected posters presented at the symposium.
Book Synopsis Organocatalytic Enantioselective Conjugate Addition Reactions by : Jose L Vicario
Download or read book Organocatalytic Enantioselective Conjugate Addition Reactions written by Jose L Vicario and published by Royal Society of Chemistry. This book was released on 2010-10-18 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, unique in its field, is a comprehensive description of all the methodologies reported for carrying out conjugate addition reactions in a stereoselective way, using small chiral organic molecules as catalysts (organocatalysts). In the last 3-4 years, this has been a rapidly growing field in organic chemistry, and many papers have appeared reporting excellent protocols for carrying out these highly efficient transformations that compete well with other classical approaches using transition metal catalysts. A particularly attractive feature of this transformation relies upon the fact that the conjugate addition (Michael and Hetero-Michael reactions) is an extraordinarily effective means to initiate cascade processes which result in the formation of complex molecules from very small and simple starting blocks. The book, written by noted experts, covers all recent advances in this hot topic, and provides a good state-of-the-art review for organic chemists working in this field and all those who wish to start projects in this area.
Book Synopsis Studies Toward the Synthesis of a Novel Diastereomerically Pure Cyclopropyl N-heterocyclic Carbene Ligand for Asymmetric Catalysis by : Brandon T. Milliken
Download or read book Studies Toward the Synthesis of a Novel Diastereomerically Pure Cyclopropyl N-heterocyclic Carbene Ligand for Asymmetric Catalysis written by Brandon T. Milliken and published by . This book was released on 2014 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This M.S. Thesis research objective is designed towards the racemic synthesis of a novel diastereoselectively pure, sterically bulky, cyclopropyl-containing, N-heterocyclic carbene (NHC) ligand. It is hypothesized that introduction of the sterically bulky cyclopropyl moiety at the N-substituent position of the imidazolium backbone will cause the self-assembly to develop a well defined C2-symmetric N-heterocyclic ligand, thereby limiting the free rotation about the C-N bond and creating a well-defined chiral pocket. It was discovered through utilizing classic synthetic methods that a diastereomeric imidazolium salt product was yielded, which can be attributed to the racemic synthesis of a diastereomeric cyclopropane starting material."--Abstract.
Book Synopsis Chiral Ferrocenes in Asymmetric Catalysis by : Li-Xin Dai
Download or read book Chiral Ferrocenes in Asymmetric Catalysis written by Li-Xin Dai and published by John Wiley & Sons. This book was released on 2010-02-01 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book meets the long-felt need for a reference on ferrocenes with the focus on catalysis. It provides a thorough overview of the synthesis and characterization of different types of chiral ferrocene ligands, their application to various catalytic asymmetric reactions, and versatile chiral materials as well as drug intermediates synthesized from them. Written by the "who's who" of ferrocene catalysis, this is a guide to the design of new ferrocene ligands and synthesis of chiral synthetic intermediates, and will thus be useful for organic, catalytic and synthetic chemists working in academia, industrial research or process development.
Book Synopsis Development of Effective Chiral Ligands for Catalytic Asymmetric Hydrogenation by : Weicheng Zhang
Download or read book Development of Effective Chiral Ligands for Catalytic Asymmetric Hydrogenation written by Weicheng Zhang and published by . This book was released on 2009 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enantioselective Catalytic Conjugate Reduction of Nitroalkenes and Development of New Chiral Bidentate Carbene Ligands by : Constantin Otto Czekelius
Download or read book Enantioselective Catalytic Conjugate Reduction of Nitroalkenes and Development of New Chiral Bidentate Carbene Ligands written by Constantin Otto Czekelius and published by . This book was released on 2004 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Designs, Syntheses, and Applications of N-heterocyclic and Acyclic Diaminocarbene-metal Complexes by : Sebastien Inagaki
Download or read book Designs, Syntheses, and Applications of N-heterocyclic and Acyclic Diaminocarbene-metal Complexes written by Sebastien Inagaki and published by . This book was released on 2012 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of a chiral isoquinoline-based N-heterocyclic carbene was revisited. Two ligands, one containing a Lewis base, were synthesized. The corresponding carbene-metal complexes were then used in different catalytic and asymmetric systems to seek greater reactivity and enantioselectivity. Acyclic diaminocarbene ligands have also a potential in asymmetric synthesis. However, their backbones make it more challenging to control their enantioselectivity. Simple achiral ADC-metal complexes could also achieve good reactivity with a new method of generating them in situ. A new ADC-iridium complex was synthesized and its X-ray structure was obtained showing the presence of only one conformer of the ligand.
Book Synopsis New N-heterocyclic Carbene Ligands and Their Applications in Organometallic Catalysis by : Linglin Wu
Download or read book New N-heterocyclic Carbene Ligands and Their Applications in Organometallic Catalysis written by Linglin Wu and published by . This book was released on 2013 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:
