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Late Transition Metal Complexes Containing Tridentate Pincer Type 1 3 Bis O Diphenylphosphino Phenyl N N Heterocyclic Phosphenium Carbene Ligands
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Book Synopsis Late Transition Metal Complexes Containing Tridentate Pincer-type 1, 3-bis (o-diphenylphosphino) Phenyl)-N, N'-heterocyclic Phosphenium/carbene Ligands by : Baofei Pan
Download or read book Late Transition Metal Complexes Containing Tridentate Pincer-type 1, 3-bis (o-diphenylphosphino) Phenyl)-N, N'-heterocyclic Phosphenium/carbene Ligands written by Baofei Pan and published by . This book was released on 2006 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Late Transition-metal Complexes Supported by Pincer Ligands by : Wilson D. Bailey
Download or read book Late Transition-metal Complexes Supported by Pincer Ligands written by Wilson D. Bailey and published by . This book was released on 2016 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Late transition-metal pincer complexes of primarily palladium(II) and platinum(II) have been investigated for their application as catalysts in partial oxidation reactions. The epoxidation of higher olefins using molecular oxygen as the oxidant has been targeted, and the individual reaction steps needed to accomplish this overall transformation are described herein, including: (1) hydrogenolysis of a metal hydroxide (M-OH) species to yield a metal hydride (M-H), (2) insertion of O2 into the M-H bond to form a metal hydroperoxide (M-OOH), and (3) O-atom transfer from the M-OOH to epoxides, yielding a M-OH and completing the catalytic cycle. Previous results from our group on these individual transformations using (tBuPCP)Pd and (tBuPCO)Pd fragments are also reviewed. The requirements for O2 insertion into PdII and PtII hydrides are discussed. An array of cationic, neutral, and anionic Pd-H and Pt-H complexes supported by a tBuPNP backbone were synthesized and evaluated for O2 insertion (tBuPNP = 2,6-bis-(di-tbutylphosphinomethyl)pyridine). Metal-ligand cooperation was observed in the activation of H2 to form neutral hydride complexes. The effect of ligand protonation/deprotonation on the trans influence experienced by the hydride ligand was investigated. No reaction with O2 was observed with the cationic hydrides, while the neutral and anionic forms reacted with O2 at the tBuPNP backbone. The synthesis and characterization of mono- and dinuclear Pd-OH complexes supported by a PCNR pincer ligand (PCNR = (1-(3-((di-tert-butylphosphino)methyl)phenyl)-1H-5-R-pyrazole), R = H, Me) is presented. When R = H, ligand pyrazole "rollover" C-H activation was observed, forming a mixed ligand (PCNH)Pd(μ-OH)Pd(PCC) dinuclear structure. This "rollover" was investigated using DFT computations. The mono- and dinuclear hydroxide species were evaluated for hydrogenolysis. The dinuclear compounds {[(PCNR)Pd]2(μ-OH)}[OTf] reacted under an H2 atmosphere to yield the corresponding dinuclear hydrides {[(PCNR)Pd]2(μ-H)}[OTf]. A mechanistic study on the hydrogenolysis of the μ-bridged hydroxide {[(PCNMe)Pd]2(μ-OH)}[OTf] revealed first order kinetics in both [Pd] and [H2]. Terminal hydrides were not detected, and reduction of the mononuclear hydroxide complexes (PCNR)Pd-OH to Pd0 was observed under H2. The reduction was proposed to proceed through displacement of the pyrazole arm, and was examined by DFT computations. Lastly, a new strategy to promote O-atom transfer from M-OOH to epoxides, the final step in the targeted catalytic cycle, is proposed. Preliminary studies on NNNPyz, NNNEt, and NNMe ligated PdII and PtII are discussed (NNNPyz = 2,6-bis(5-tbutyl-1H-pyrazol-3-yl)pyridine; NNNEt = 2-(5-tbutyl-1H-pyrazol-3-yl)-6-(diethylaminomethyl)pyridine; NNMe = 2-(5-tBu-1H-pyrazol-3-yl)-6-methylpyridine). The NNNPyz ligand, containing two acidic sites in proximity to the fourth site in the square plane, was found to protonate M-O2 complexes, chelate to the metal center and oxidize phosphine substrates. Similar reactivity was observed with NNNEt and NNMe, however hemilability of these ligands resulted in undesired coordination modes.
Book Synopsis Early Transition Metal Complexes of Carbene Donors Linked to Cyclopentadienyl Ring Analogues Or Amidine by : Susan Conde Guadano
Download or read book Early Transition Metal Complexes of Carbene Donors Linked to Cyclopentadienyl Ring Analogues Or Amidine written by Susan Conde Guadano and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The new indenyl-functionalised NHC potassium salt, 1-[3-(4,7-dimethylindenylpropyl)]-3- (2,6-diisopropylphenyl)imidazol-2-ylidenepotassium, has been synthesised. Complexes of titanium, zirconium and chromium containing this ligand and the two carbon bridge analogue, 1-[2-(4,7-dimethylindenyl)ethyl]-3-(2,6-diisopropylphenyl)imidazol-2 ylidene potassium, have been synthesised and characterised by X-ray crystallographic techniques. The following complexes were tested as catalysts for the oligomerisation of ethylene in the presence of MAO: 3-(2,6-diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidene(tertbutylimido) titanium chloride, 3-(2,6-diisopropylphenyl)-1-[3-(4,7- dimethylindenyl)propyl]imidazol-2-ylidene(tert-butylimido)titanium chloride, 3-(2,6- diisopropylphenyl)-1-[3-(4,7-dimethylindenyl)propyl]imidazol-2-ylidenezirconium trichloride, 3-(2,6-diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]imidazol-2- ylidenezirconium trichloride, 3-(2,6-Diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]- imidazol-2-ylidenechromium dichloride, 3-(2,6-diisopropylphenyl)-1-[3-(4,7- (dimethylindenyl))propyl]imidazol-2-ylidene chromium dichloride, 3-(2,6-diisopropylphenyl)- 1-[3-(4,7-dimethylindenyl)propyl]-imidazol-2-ylidene chromium methyl chloride and 3-(2,6- diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidenevanadium dichloride. The following alkyl chromium complexes containing 1-[2-(4,7-dimethylindenyl)ethyl]-3-(2,6- diisopropylphenyl)imidazol-2 ylidene potassium have also been synthesised: 3-(2,6- diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidene chromium phenyl chloride and 3-(2,6-diisopropyl-phenyl)-1-[2-(4, 7-dimethylindenyl)ethyl]-imidazol-2-ylidene chromium dibenzyl. Chromium cations have been synthesised using as starting materials the chromium alkyl complexes. The Cr(II) complex 3-(2,6-diisopropyl-phenyl)-1-[2-(4, 7- dimethylindenyl)ethyl]-imidazol-2-ylidene chromium monochloride and a partially oxidised dimerised product were also isolated. 5-(2-chloroethyl)- 1, 2, 3, 4-tetramethylcyclopentadiene and 5-(3-chloropropyl) 1, 2, 3, 4-tetramethylcyclopentadiene were synthesised and isolated as geminal isomers for the first time. The trialkyl chromium complex, tribenzyl chromium tris(tetrahydrofuran) was synthesised and also it was used as starting material for the complexes di(benzyl)chromium bis(1, 3- diisopropylimidazol-2-ylindene) and tri(benzyl)chromium TACN. All complexes were characterised by X-ray crystallography. The imidazolium salt 3-(2.6-diisopropylphenyl)-1-[N, N-bis(2,6- diisopropylphenyl)acetamidyl] imidazolium chloride was synthesised and used as a precursor for the synthesis of amidinate-functionalised NHC zirconium and amidine-functionalised NHC silver complexes. Double deprotonation of 3-(2,6-diisopropylphenyl)-1-[N, N'-bis(2,6- diisopropylphenyl)acetamidyl] imidazolium chloride gave the amidinate-functionalised NHC ligand, 3-(2.6-diisopropylphenyl)-1-[2-N, N'bis(2,6 diisopropylphenylamidinate)ethyl]imidazol-2-ylidenepotassium. Titanium, zirconium and chromium complexes containing this ligand were synthesised and characterised by X-ray crystallographic techniques. Transmetallation of the amidine-functionalised NHC silver complex with [Rh(COD)Cl]2 and [Ir(COD)Cl]2 gave the corresponding species. Rh(amidinefunctionalised NHC)(COD)Cl reacted with Na(BAr)4 (Ar = 3,5-CF3C6H3) to give the cation Rh(amidine-functionalised NHC)(COD)]+[BAr4]-. These species were also characterised by X-ray diffraction techniques.
Book Synopsis Polynuclear Main Group and Transition Metal Complexes Containing the Tridentate Ligand, Bis(diphenylphosphinomethyl)phenylarsine by : Philip Edward Reedy
Download or read book Polynuclear Main Group and Transition Metal Complexes Containing the Tridentate Ligand, Bis(diphenylphosphinomethyl)phenylarsine written by Philip Edward Reedy and published by . This book was released on 1987 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterisation of Late Transition Metal Complexes Containing Novel Mixed N-heterocyclic Carbene and Thione Donors by :
Download or read book Synthesis and Characterisation of Late Transition Metal Complexes Containing Novel Mixed N-heterocyclic Carbene and Thione Donors written by and published by . This book was released on 2012 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Metal Complexes of Phosphinite Ligands as Catalysts for Asymmetric Hydrogenation Reactions by : Angela T. Slade
Download or read book Metal Complexes of Phosphinite Ligands as Catalysts for Asymmetric Hydrogenation Reactions written by Angela T. Slade and published by . This book was released on 2007 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this thesis are two-fold. First to ascertain how phosphinite compounds behave when reacted with transition metal substrates. The second objective is to establish whether the resulting complexes were asymmetric catalysts for conversion of prochiral substrates to chiral products in high ee.
Book Synopsis Imidazole and Benzimidazole Synthesis by : M. R. Grimmett
Download or read book Imidazole and Benzimidazole Synthesis written by M. R. Grimmett and published by Academic Press. This book was released on 1997-06-02 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imidazole and Benzimidazole Synthesis is a comprehensive survey of the known methods of syntheses and ring modification. It brings together the multitude of synthesis of the imidazole ring in a systemic way interms of specific bond formation, and recommends the most attractive synthetic approaches. It also collects non-ring-synthetic approaches to classes of compounds such as nitro-, halogeno-, and amino-imidazoles, and covers the synthesis of N-substituted compounds and preparations of specific isomers. The only book in print dealing specifically with this topic Comprehensive survey of the known methods of synthesis and ring modification Recommends the most attractive synthetic approaches
Book Synopsis Tungsten Complexes by : Harry Beckerman
Download or read book Tungsten Complexes written by Harry Beckerman and published by . This book was released on 1918 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organic Reaction Mechanisms 2015 by : A. C. Knipe
Download or read book Organic Reaction Mechanisms 2015 written by A. C. Knipe and published by John Wiley & Sons. This book was released on 2019-02-08 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic Reaction Mechanisms 2015, the 51st annual volume in this highly successful and unique series, surveys research on organic reaction mechanisms described in the available literature dated 2015. The following classes of organic reaction mechanisms are comprehensively reviewed: Reaction of Aldehydes and Ketones and their Derivatives Reactions of Carboxylic, Phosphoric, and Sulfonic Acids and their Derivatives Oxidation and Reduction Carbenes and Nitrenes Nucleophilic Aromatic Substitution Electrophilic Aromatic Substitution Carbocations Nucleophilic Aliphatic Substitution Carbanions and Electrophilic Aliphatic Substitution Elimination Reactions Polar Addition Reactions Cycloaddition Reactions Molecular Rearrangements An experienced team of authors compile these reviews every year, so that the reader can rely on a continuing quality of selection and presentation.
Book Synopsis Phosphorous Heterocycles I by : Raj K. Bansal
Download or read book Phosphorous Heterocycles I written by Raj K. Bansal and published by Springer. This book was released on 2009-05-28 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: See Table of Contents (PMP)
Book Synopsis Activation of Small Molecules by : William B. Tolman
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 Iron Catalysis written by Bernd Plietker and published by Springer Science & Business Media. This book was released on 2011-01-05 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Juan I. Padrón and Víctor S. Martín: Catalysis by means of Fe-based Lewis acids; Hiroshi Nakazawa*, Masumi Itazaki: Fe–H Complexes in Catalysis; Kristin Schröder, Kathrin Junge, Bianca Bitterlich, and Matthias Beller: Fe-catalyzed Oxidation Reactions of Olefins, Alkanes and Alcohols: Involvement of Oxo- and Peroxo Complexes; Chi-Ming Che, Cong-Ying Zhou, Ella Lai-Ming Wong: Catalysis by Fe=X Complexes (X=NR, CR2); René Peters, Daniel F. Fischer and Sascha Jautze: Ferrocene and Half Sandwich Complexes as Catalysts with Iron Participation; Markus Jegelka, Bernd Plietker: Catalysis by Means of Complex Ferrates.
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:
Book Synopsis Green Chemistry and Catalysis by : R. A. Sheldon
Download or read book Green Chemistry and Catalysis written by R. A. Sheldon and published by John Wiley & Sons. This book was released on 2007-06-27 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first book to focus on catalytic processes from the viewpoint of green chemistry presents every important aspect: · Numerous catalytic reductions and oxidations methods · Solid-acid and solid-base catalysis · C-C bond formation reactions · Biocatalysis · Asymmetric catalysis · Novel reaction media like e.g. ionic liquids, supercritical CO2 · Renewable raw materials Written by Roger A. Sheldon -- without doubt one of the leaders in the field with much experience in academia and industry -- and his co-workers, the result is a unified whole, an indispensable source for every scientist looking to improve catalytic reactions, whether in the college or company lab.
Book Synopsis N-Heterocyclic Carbenes by : Silvia Diez-Gonzalez
Download or read book N-Heterocyclic Carbenes written by Silvia Diez-Gonzalez and published by Royal Society of Chemistry. This book was released on 2016-11-04 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: In less than 20 years N-heterocyclic carbenes (NHCs) have become well-established ancillary ligands for the preparation of transition metal-based catalysts. This is mainly due to the fact that NHCs tend to bind strongly to metal centres, avoiding the need of excess ligand in catalytic reactions. Also, NHC‒metal complexes are often insensitive to air and moisture, and have proven remarkably resistant to oxidation. This book showcases the wide variety of applications of NHCs in different chemistry fields beyond being simple phosphine mimics. This second edition has been updated throughout, and now includes a new chapter on NHC‒main group element complexes. It covers the synthesis of NHC ligands and their corresponding metal complexes, as well as their bonding and stereoelectronic properties and applications in catalysis. This is complemented by related topics such as organocatalysis and biologically active complexes. Written for organic and inorganic chemists, this book is ideal for postgraduates, researchers and industrialists.
Book Synopsis Modern Arylation Methods by : Lutz Ackermann
Download or read book Modern Arylation Methods written by Lutz Ackermann and published by John Wiley & Sons. This book was released on 2009-04-22 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, arylation methods are belonging to the most important reaction types in organic synthesis. Lutz Ackermann, a young and ambitious professor has gathered a number of top international authors to present the first comprehensive book on the topic. Starting from a historical review, the book covers hot topics like Palladium-catalyzed arylation of N-H and alpha-C-H-acidic Bonds, Copper-catalyzed arylation of N-H and O-H Bonds, direct arylation reactions, carbanion aromatic synthesis, arylation reactions of alkenes, alkynes and much more. This compact source of high quality information is indispensable to synthetic chemists and those working in the pharmaceutical and chemical industry.
Book Synopsis Chemical Physics and Quantum Chemistry by :
Download or read book Chemical Physics and Quantum Chemistry written by and published by Academic Press. This book was released on 2020-09-18 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Quantum Chemistry presents surveys of current topics in this rapidly developing field one that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry, and biology. It features detailed reviews written by leading international researchers. In this volume the readers are presented with an exciting combination of themes. Presents surveys of current topics in this rapidly-developing field that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry and biology Features detailed reviews written by leading international researchers Topics include: New advances in Quantum Chemical Physics; Original theory and a contemporary overview of the field of Theoretical Chemical Physics; State-of-the-Art calculations in Theoretical Chemistry
