Download or read book Synthesis of Phosphino silyl Ligated Nickel Complexes for the Catalytic Hydroboration of Alkenes written by Sydney Shepard and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bis(phosphino)silyl (PSiP) pincer ligands have been studied extensively. While there are several examples of late transition metal complexes, in recent years there has been a shift to study these ligands on first-row transition metals (i.e., Fe, Co, Ni). These complexes have shown to be active in catalytic hydrofunctionalization; however, the turn-over for larger substrates has proved challenging. Therefore, the question of reducing the size of the phosphino(silyl) ancillary ligand is investigated in this document. While varying the substitution at phosphorus is common, access to smaller substituents is not straightforward. A different approach is to eliminate a phosphine donor. A new bidentate PSi ligand has been synthesized and studied with respect to Ni complexes. In this regard, studying the catalytic hydroboration with a substrate scope involving terminal, di-, and tri-substituted alkenes and three Ni(II) precatalysts has been explored, where selectivity for chain-walking of internal alkenes to the terminal position was observed.
Download or read book Nickel Catalysis in Organic Synthesis written by Sensuke Ogoshi and published by John Wiley & Sons. This book was released on 2020-03-09 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive reference to nickel chemistry for every scientist working with organometallic catalysts Written by one of the world?s leading reseachers in the field, Nickel Catalysis in Organic Synthesis presents a comprehensive review of the high potential of modern nickel catalysis and its application in synthesis. Structured in a clear and assessible manner, the book offers a collection of various reaction types, such as cross-coupling reactions, reactions for the activation of unreactive bonds, carbon dioxide fixation, and many more. Nickel has been recognized as one of the most interesting transition metals for homogeneous catalysis. This book offers an overview to the recently developed new ligands, new reaction conditions, and new apparatus to control the reactivity of nickel catalysts, allowing scientists to apply nickel catalysts to a variety of bond-forming reactions. A must-read for anyone working with organometallic compounds and their application in organic synthesis, this important guide: -Reviews the numerous applications of nickel catalysis in synthesis -Explores the use of nickel as a relatively cheap and earth-abundant metal -Examines the versatility of nickel catalysis in reactions like cross-coupling reactions and CH activations -Offers a resource for academics and industry professionals Written for catalytic chemists, organic chemists, inorganic chemists, structural chemists, and chemists in industry, Nickel Catalysis in Organic Synthesis provides a much-needed overview of the most recent developments in modern nickel catalysis and its application in synthesis.
Download or read book The Organic Chemistry of Nickel written by P.W. Jolly and published by Elsevier. This book was released on 2012-12-02 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Organic Chemistry of Nickel, Volume II: Organic Synthesis describes the chemistry of the organonickel complexes and the use of nickel in organic synthesis. Composed of six chapters, this volume starts with discussions on the oligomerization, co-oligomerization, and polymerization of olefins, followed by short accounts of the mechanistically related isomerization and hydrogenation of olefins, as well as the hydrosilylation and hydrocyanation reactions. Chapter II examines the oligomerization of acetylene and substituted alkynes, the co-oligomerization of alkynes with olefins, the related oligomerization of allene, including a number of telomerization reactions involving alkynes or allenes. Chapters III and IV describe the oligomerization, co-oligomerization, and polymerization of butadiene and substituted 1,3-dienes. Chapter V explores the coupling of organic halides in the presence of stoichiometric amounts of zerovalent nickel complexes, and the nickel-catalyzed cross-coupling reaction between organic halides and Grignard reagents. Lastly, Chapter VI emphasizes the carbonylation of alkynes, olefins, and organic halides using nickel complexes. This book will be of great value to organic chemists and researchers who are interested in the application of nickel complexes to organic synthesis.
Download or read book Nickel catalyzed Hydroboration and Hydrosilylation written by Md Istiak Hossain and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition-metal-catalyzed hydroelementation is one of the most important methods for the synthesis of functionalized molecules. Hydroboration and hydrosilylation are two important classes of hydroelementation reactions. In chapter 1, the applications of these transformations, recent catalyst development, and the operating mechanisms are briefly discussed. The challenges and scope in base-metal catalysis for hydroboration and hydrosilylation are also described. In chapter 2, the selective hydroboration of aldehydes and N-allylimines utilizing a well-defined cationic nickel complex is described. The catalyst displayed excellent selectivity toward aldehydes in the presence of ketones. A wide variety of functional groups were tolerated, including halogens, nitro, cyano, and alkenes for both aldehydes and imines. Electron-rich substrates were found to be significantly more reactive than their electron poor counterparts, a unique feature, reported for the first time in metal-catalyzed hydroboration. Stoichiometric reactions with the catalyst disclosed that the substates were activated through a Lewis acidic interaction and undergo hydroboration with pinacolborane (HBpin) under mild reaction conditions. In chapter 3, seven structurally similar cationic nickel(II)−alkyl complexes were synthesized by using a series of P, N ligands, following the previously developed protocol from our lab and their reactivity was explored in the hydrosilylation of alkenes. Newly synthesized catalysts were characterized by NMR spectroscopy, elemental analysis, and X-ray crystallography. The study showed that more electron-rich phosphines enhanced the overall reactivity of the hydrosilylation; in contrast, groups on the imine donor had little impact. Overall, these catalysts displayed reactivity and selectivity that was previously unknown or very rare in nickel-catalyzed hydrosilylation. In reactions with Ph2SiH2, 1,2-disubstituted vinylarenes showed complete benzylic selectivity for silane addition, whereas terminal selectivity was observed for 1,1-disubstituted alkenes. The related PhSiH3 led to exclusively Markovnikov selectivity for monosubstituted vinylarenes with no competing double addition observed. Mechanistic investigations supported the hypothesis that a Ni−H functions as the active species in this catalytic hydrosilylation, which in turn also showed catalytic competence for the silane redistribution reaction, especially with sterically unhindered silanes. In chapter 4, a series of cationic nickel complexes were employed in the hydrosilylation of 1,3-dienes and their reactivities were assessed. Both 1,2- and 1,4-hydrosilylations were observed depending on the P,N ligand and silane employed. The electron-rich P,N-ligand furnished the (E)-1,2-addition product, whereas, the electron-poor P,N-ligand produced the 1,4-adduct predominantly. The 1,4-hydrosilylation product was formed with a high degree of Z-selectivity, which is very rare in base-metal-catalyzed hydrosilylation. A brief substrate scope and possible mechanistic pathways are discussed.
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.
Download or read book Organosilicon Compounds written by Vladimir Ya Lee and published by Academic Press. This book was released on 2017-08-22 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organosilicon Compounds: Theory and Experiment (Synthesis), volume 1, comprises two parts. The first part, Theory, covers state-of-the-art computational treatments of unusual nonstandard organosilicon compounds that classical bonding theory fails to describe adequately. The second part, Experiment (Synthesis), describes recent synthetic advances in the preparation of a variety of organosilicon compounds with different coordination numbers of the central silicon: from tetracoordinate to low-coordinate to hypercoordinate derivatives. Organosilicon Compounds: From Theory to Synthesis to Applications provides a comprehensive overview of this important area of organic and organometallic chemistry, dealing with compounds containing carbon–silicon bonds. This field, which includes compounds that are widely encountered in commercial products such as in the fabrication of sealants, adhesives, and coatings, has seen many milestone discoveries reported during the last two decades. Beginning with the theoretical aspects of organosilicon compounds’ structure and bonding, the book then explores their synthetic aspects, including main group element organosilicon compounds, transition metal complexes, silicon cages and clusters, low-coordinate organosilicon derivatives (cations, radicals, anions, multiple bonds to silicon, silaaromatics), and more. Next, readers will find valuable sections that explore physical and chemical properties of organosilicon compounds by means of X-ray crystallography, 29Si NMR spectroscopy, photoelectron spectroscopy, and other methods. Finally, the work delves into applications for industrial uses and in many related fields, such as polymers, material science, nanotechnology, bioorganics, and medicinal silicon chemistry. Features valuable contributions from prominent experts that cover both fundamental (theoretical, synthetic, physico-chemical) and applied (material science, applications) aspects of modern organosilicon chemistry Covers important breakthroughs in the field, along with the historically significant achievements of the past Includes applied information for a wide range of specialists, from junior and senior researchers (from both academia and industry) Ideal reference for those working in organometallic, organosilicon, main group element, transition metal, and industrial silicon chemistry, as well as those from interdisciplinary fields, such as polymer, material science, and nanotechnology
Download or read book Synthesis and Characterization of Phosphino Nickel II Complexes and Their Silica Immobilized Versions for the Hydrogenation of Furfural to Furfuryl Alcohol written by Menala Kalumpha and published by . This book was released on 2020 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal Dinitrogen Complexes written by Yoshiaki Nishibayashi and published by John Wiley & Sons. This book was released on 2019-05-06 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive book that explores nitrogen fixation by using transition metal-dinitrogen complexes Nitrogen fixation is one of the most prominent fields of research in chemistry. This book puts the focus on the development of catalytic ammonia formation from nitrogen gas under ambient reaction conditions that has been recently repowered by some research groups. With contributions from noted experts in the field, Transition Metal-Dinitrogen Complexes offers an important guide and comprehensive resource to the most recent research and developments on the topic of nitrogen fixation by using transition metal-dinitrogen. The book is filled with the information needed to understand the synthesis of transition metal-dinitrogen complexes and their reactivity. This important book: -Offers a resource for understanding nitrogen fixation chemistry that is essential for explosives, pharmaceuticals, dyes, and all forms of life -Includes the information needed for anyone interested in the field of nitrogen fixation by using transition metal-dinitrogen complexes -Contains state-of-the-art research on synthesis of transition metal-dinitrogen complexes and their reactivity in nitrogen fixation -Incorporates contributions from well-known specialists and experts with an editor who is an innovator in the field of dinitrogen chemistry Written for chemists and scientists with an interest in nitrogen fixation, Transition Metal-Dinitrogen Complexes is a must-have resource to the burgeoning field of nitrogen fixation by using transition metal-dinitrogen complexes.
Download or read book Nickel Precatalysts as Enabling Tools for Catalytic Coupling Reactions written by Eric Alan Standley and published by . This book was released on 2015 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Chemical formula] A series of air-stable nickel complexes of the form L2Ni(aryl)X (L = monodentate phosphine, X = Cl, Br) and LNi(aryl)X (L = bis-phosphine) have been synthesized and are presented as a library of precatalysts suitable for a wide variety of nickel-catalyzed transformations. These complexes are easily synthesized from low-cost NiCl2-6H2O or NiBr2-3H2O and the desired ligand followed by addition of 1 equiv of Grignard reagent. A selection of these complexes were characterized by single-crystal X-ray diffraction, and an analysis of their structural features is provided. [Chemical formula] The air-stable nickel(II) complex trans-(PCy2Ph)2Ni(o-tolyl)Cl was employed as a precatalyst for the Mizoroki-Heck-type, room temperature, internally selective coupling of substituted benzyl chlorides with terminal alkenes. This reaction, which employs a terminal alkene as an alkenylmetal equivalent, provides rapid, convergent access to substituted allylbenzene derivatives in high yield and with regioselectivity greater than 95:5 in nearly all cases. The reaction is operationally simple, can be carried out on the benchtop with no purification or degassing of solvents or reagents, and requires no exclusion of air or water during setup. Synthesis of the precatalyst is accomplished through a straightforward procedure that employs inexpensive, commercially available reagents, requires no purification steps, and proceeds in high yield. [Chemical formula] The nickel-catalyzed cross-coupling of aliphatic N-tosylaziridines with aliphatic organozinc reagents is described. The reaction protocol displays complete regioselectivity for reaction at the less hindered C-N bond, and the products are furnished in good to excellent yield for a broad selection of substrates. An air-stable nickel(II) chloride/ligand precatalyst was also developed and employed for the reaction. In addition to increasing the activity of this catalyst system, this also greatly improves the practicality of this reaction, as the use of the very air-sensitive Ni(cod)2 is avoided. Finally, mechanistic investigations, including deuterium-labeling studies, show that the reaction proceeds with overall inversion of configuration at the terminal position of the aziridine by way of aziridine ring opening by Ni (inversion), transmetallation (retention), and reductive elimination (retention).
Download or read book Synthesis and Initial Reactivity Studies of Nickel Complexes on a Pincer Scaffold written by Huy Dao and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytic oxidation reactions are prevalent in the chemical industry. The catalysts are often made with expensive metals and the mechanism(s) by which they operate are not well known. Studies of small molecules can lead to better understanding of mechanisms and thus lead to better catalysis design. Work has also been performed in designing catalysts using less costly metals. Nickel is one such metal, as it is a congener of platinum and palladium, two costly metals used widely in catalysis. Ligands can be altered to influence electronic and steric properties of the metal complexes, thus affecting catalytic activity. This thesis addresses the modification of an SCS pincer ligand and the synthesis of new nickel-SCS pincer complexes. Pincers are tridentate ligands that bind at adjacent coplanar sites. The designation "SCS" refers to the atoms at the coordination sites. The nickel-pincer complexes in this work are built from 2,6- bis(alkylthiomethyl)bromobenzene skeletons, with the alkyl groups being altered. The work presented herein describes the synthesis and characterization of Ni(SCSiPr)Br, Ni(SCStBu)Br, Ni(SCSMe)OPh, and Ni(SCSMe)Me. The reactivity of Ni(SCSMe)Me was studied and found to form Ni(SCSMe)OPh when reacted with phenol. This showed that Ni(SCSMe)Me was able to deprotonate an acidic species to form a new complex. Ni(SCSMe)Me was also found to catalyze the oxidation of triphenylphosphine to triphenylphosphine oxide when dry O2 was introduced. Eight to ten turnovers were observed.
Download or read book Pincer Compounds written by David Morales-Morales and published by Elsevier. This book was released on 2018-04-11 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pincer Compounds: Chemistry and Applications offers valuable state-of-the-art coverage highlighting highly active areas of research—from mechanistic work to synthesis and characterization. The book focuses on small molecule activation chemistry (particularly H2 and hydrogenation), earth abundant metals (such as Fe), actinides, carbene-pincers, chiral catalysis, and alternative solvent usage. The book covers the current state of the field, featuring chapters from renowned contributors, covering four continents and ranging from still-active pioneers to new names emerging as creative strong contributors to this fascinating and promising area. Over a decade since the publication of Morales-Morales and Jensen’s The Chemistry of Pincer Compounds (Elsevier 2007), research in this unique area has flourished, finding a plethora of applications in almost every single branch of chemistry—from their traditional application as very robust and active catalysts all the way to potential biological and pharmaceutical applications. Describes the chemistry and applications of this important class of organometallic and coordination compounds Includes contributions from global leaders in the field, featuring pioneers in the area as well as emerging experts conducting exciting research on pincer complexes Highlights areas of promising and active research, including small molecule activation, earth abundant metals, and actinide chemistry
Download or read book Activation of Small Molecules written by William B. Tolman and published by John Wiley & Sons. This book was released on 2006-12-13 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first to combine both the bioinorganic and the organometallic view, this handbook provides all the necessary knowledge in one convenient volume. Alongside a look at CO2 and N2 reduction, the authors discuss O2, NO and N2O binding and reduction, activation of H2 and the oxidation catalysis of O2. Edited by the highly renowned William Tolman, who has won several awards for his research in the field.
Download or read book Organosilicon Chemistry written by Tamejiro Hiyama and published by John Wiley & Sons. This book was released on 2020-02-18 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a unique summary of important catalytic reactions in the presence of silicon A must-have for all synthetic chemists, this book summarizes all of the important developments in the application of organosilicon compounds in organic synthesis and catalysis. Edited by two world leaders in the field, it describes different approaches and covers a broad range of reactions, e.g. catalytic generation of silicon nucleophiles, Si-H Bond activation, C-H bond silylation, silicon-based cross-coupling reactions, and hydrosilylation in the presence of earth-abundant metals. In addition to the topics covered above, Organosilicon Chemistry: Novel Approaches and Reactions features chapters that look at Lewis base activation of silicon Lewis acids, silylenes as ligands in catalysis, and chiral silicon molecules. -The first book about this topic in decades, covering a broad range of reactions -Covers new approaches and novel catalyst systems that have been developed in recent years -Written by well-known, international experts in the areas of organometallic silicon chemistry and organosilicon cross-coupling reactions Organosilicon Chemistry: Novel Approaches and Reactions is an indispensable source of information for synthetic chemists in academia and industry, working in the field of organic synthesis, catalysis, and main-group chemistry.
Download or read book Metal Complexes written by Xue Duan and published by Springer. This book was released on 1981-03-01 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organophosphorus Chemistry written by David W Allen and published by Royal Society of Chemistry. This book was released on 2020-04-15 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: This annual review of the literature presents a comprehensive and critical survey of the vast field of study involving organophosphorus compounds, from phosphines and related P-C bonded compounds to phosphorus acids, phosphine chalcogenides and nucleotides. The Editors have added to the content with a timely chapter on the recent developments in green synthetic approaches in organophosphorus chemistry to reflect current interests in the area. With an emphasis on interdisciplinary content, this book is aimed at the worldwide organic chemistry and engineering research communities.
Download or read book Catalysis with Earth abundant Elements written by Uwe Schneider and published by Royal Society of Chemistry. This book was released on 2020-10-30 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considering the limited resources of our planet, earth-abundant elements will have to be explored increasingly in the future. This book highlights the uses of the most earth-abundant elements in catalysis and will be of interest to graduates, academic researchers and practitioners in catalysis.
Download or read book Applied Cross Coupling Reactions written by Yasushi Nishihara and published by Springer Science & Business Media. This book was released on 2012-12-14 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: “Applied Cross-Coupling Reactions” provides students and teachers of advanced organic chemistry with an overview of the history, mechanisms and applications of cross-coupling reactions. Since the discovery of the transition-metal-catalyzed cross-coupling reactions in 1972, numerous synthetic uses and industrial applications have been developed. The mechanistic studies of the cross-coupling reactions have disclosed that three fundamental reactions: oxidative addition, transmetalation, and reductive elimination, are involved in a catalytic cycle. Cross-coupling reactions have allowed us to produce a variety of compounds for industrial purposes, such as natural products, pharmaceuticals, liquid crystals and conjugate polymers for use in electronic devices. Indeed, the Nobel Prize for Chemistry in 2010 was awarded for work on cross-coupling reactions. In this book, the recent trends in cross-coupling reactions are also introduced from the point of view of synthesis design and catalytic activities of transition-metal catalysts.
