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The Privileged Pincer Metal Platform Coordination Chemistry Applications

The Privileged Pincer Metal Platform  Coordination Chemistry   Applications Book
Author : Gerard van Koten,Robert A Gossage
Publisher : Springer
Release : 2015-08-27
ISBN : 3319229273
Language : En, Es, Fr & De

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Book Description :

The series Topics in Organometallic Chemistry presents critical overviews of research results in organometallic chemistry. As our understanding of organometallic structure, properties and mechanisms increases, new ways are opened for the design of organometallic compounds and reactions tailored to the needs of such diverse areas as organic synthesis, medical research, biology and materials science. Thus the scope of coverage includes a broad range of topics in pure and applied organometallic chemistry, where new breakthroughs are being achieved that are of significance to a larger scientific audience. The individual volumes of Topics in Organometallic Chemistry are thematic. Review articles are generally invited by the volume editors.

Pincer Compounds

Pincer Compounds Book
Author : David Morales-Morales
Publisher : Elsevier
Release : 2018-04-11
ISBN : 0128129328
Language : En, Es, Fr & De

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Book Description :

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

Pincer Metal Complexes

Pincer Metal Complexes Book
Author : Akshai Kumar Alape Seetharam
Publisher : Elsevier
Release : 2021-10-15
ISBN : 9780128220917
Language : En, Es, Fr & De

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Book Description :

Pincer-Metal Complexes: Applications in Catalytic Dehydrogenation Chemistry provides an overview of pincer-metal catalytic systems transforming hydrocarbons and their derivatives from an synthetic and mechanistic point of view. The success stories of pincer-metal systems are discussed, as well as current and future challenges. In recent years there has been a surge in the research on hydrocarbon dehydrogenation catalytic systems that are compatible with polar substituents. This helps facilitate formulation of tandem processes that are not limited to hydrocarbon transformation but also to hydrocarbon functionalization in a single pot. This book provides thorough coverage of the operating mechanisms and dehydrogenation catalyst compatibility in both functionalized and unfunctionalized hydrocarbon systems. It is an ideal reference for researchers practicing synthetic organic chemistry, inorganic chemistry, organometallic chemistry and catalysis in academia and industry. Covers applications of pincer-metal complexes in organic transformations Includes pincer-group 8 and 9 metal complexes for alkane dehydrogenations Features a discussion of pincer-metal complexes for dehydrogenation of functionalized hydrocarbons, and electro-catalytic transformations

Organometallic Pincer Chemistry

Organometallic Pincer Chemistry Book
Author : Gerard van Koten,David Milstein
Publisher : Springer
Release : 2012-09-17
ISBN : 3642310818
Language : En, Es, Fr & De

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Book Description :

Gerard van Koten: The Mono-anionic ECE-Pincer Ligand - a Versatile Privileged Ligand Platform: General Considerations.- Elena Poverenov, David Milstein: Non-Innocent Behavior of PCP and PCN Pincer Ligands of Late Metal Complexes.- Dean M. Roddick: Tuning of PCP Pincer Ligand Electronic and Steric Properties.- Gemma R. Freeman, J. A. Gareth Williams: Metal Complexes of Pincer Ligands: Excited States, Photochemistry, and Luminescence.- Davit Zargarian, Annie Castonguay, Denis M. Spasyuk: ECE-Type Pincer Complexes of Nickel.- Roman Jambor and Libor Dostál: The Chemistry of Pincer Complexes of 13 - 15 Main Group Elements.- Kálmán J. Szabo: Pincer Complexes as Catalysts in Organic Chemistry.- Jun-ichi Ito and Hisao Nishiyama: Optically Active Bis(oxazolinyl)phenyl Metal Complexes as Multi-potent Catalysts.- Anthony St. John, Karen I. Goldberg, and D. Michael Heinekey: Pincer Complexes as Catalysts for Amine Borane Dehydrogenation.- Dmitri Gelman and Ronit Romm: PC(sp3)P Transition Metal Pincer Complexes: Properties and Catalytic Applications.- Jennifer Hawk and Steve Craig: Physical Applications of Pincer Complexes.

Conjugated ECE Pincer Metal Complexes

Conjugated ECE Pincer Metal Complexes Book
Author : Guido Dirk Batema
Publisher : Unknown
Release : 2007
ISBN : 9789039345771
Language : En, Es, Fr & De

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Book Description :

Download Conjugated ECE Pincer Metal Complexes book written by Guido Dirk Batema, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Synthesis of Bifunctional Pincer Metal Complexes Containing N heterocyclic Carbenes

Synthesis of Bifunctional Pincer Metal Complexes Containing N heterocyclic Carbenes Book
Author : Derek B. Brown
Publisher : Unknown
Release : 2010
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

The goal of this research is to synthesize pincer ligands and complexes with a central pyridine ligand substituted at positions 2 and 6 by two N-heterocyclic carbenes, each bearing a pendant heteroaryl substituent. Related pincers without heteroaryl groups have been reported in the past 15 years as catalysts, and our ultimate goal was to enable the study of the heteroaryl moieties as pendant bases, creating improved bifunctional catalysts. Two classes of pincers were made: one with methylene spacers between the central pyridine and the imidazol-2-ylidene groups, and those whose imidazol-2-ylidene groups were attached directly to the pyridine without any spacers. Four bis(imidazolium) salt pincer precursors with methylene spacers were made, and reaction with Ag2O produced silver-carbene complexes which act as transmetallation agents for further complexation. Two of the analogs were able to be metallated with (COD)PdCl2 to form palladium-carbene complexes, NMR data for which are in accord with a puckered structure induced by the methylene spacers. One of these complexes showed catalytic activity in the Heck coupling reaction. Synthesis of analogs lacking spacers under literature conditions proved to be impossible, presumably because of reduced nucleophilicity of 1-heteroarylimidazoles. Thus, a systematic study of reactivity of 1-substituted imidazoles with five 2,6-disubstituted pyridines conclusively showed that 2,6-bis(trifluoromethanesulfonyloxy)pyridine (16) was the best precursor. A well-described synthesis of 16 was developed, paving the way to making seven analogs of pincer precursors without methylene spacers. Reaction of two of these pincer precursors with Ag2O and NaOH produced silver-carbene bridged-dimer complexes which were characterized by X-ray diffraction and show promise as sources of other metal complexes.

The Chemistry of Pincer Compounds

The Chemistry of Pincer Compounds Book
Author : David Morales-Morales,Craig G.M. Jensen
Publisher : Elsevier
Release : 2011-08-11
ISBN : 9780080545158
Language : En, Es, Fr & De

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Book Description :

Pincer complexes are formed by the binding of a chemical structure to a metal atom with at least one carbon-metal bond. Usually the metal atom has three bonds to a chemical backbone, enclosing the atom like a pincer. The resulting structure protects the metal atom and gives it unique properties. The last decade has witnessed the continuous growth in the development of pincer complexes. These species have passed from being curiosity compounds to chemical chameleons able to perform a wide variety of applications. Their unique metal bound structures provide some of the most active catalysts yet known for organic transformations involving the activation of bonds. The Chemistry of Pincer Compounds details use of pincer compounds including homogeneous catalysis, enantioselective organic transformations, the activation of strong bonds, the biological importance of pincer compounds as potential therapeutic or pharmaceutical agents, dendrimeric and supported materials. * Describes the chemistry and applications of this important class of organometallic and coordination compounds * Covers the areas in which pincer complexes have had an impact * Includes information on more recent and interesting pincer compounds not just those that are well-known

Metal Ligand Co operativity

Metal Ligand Co operativity Book
Author : Gerard van Koten
Publisher : Springer Nature
Release : 2021-06-16
ISBN : 3030689166
Language : En, Es, Fr & De

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Book Description :

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Activation of Carbon Dioxide by Pincer Supported Transition Metal Complexes

Activation of Carbon Dioxide by Pincer Supported Transition Metal Complexes Book
Author : Timothy J. Schmeier
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Activation of Carbon Dioxide by Pincer Supported Transition Metal Complexes book written by Timothy J. Schmeier, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Metal Ligand Co operativity

Metal Ligand Co operativity Book
Author : Gerard van Koten,Karl Kirchner,Marc-Etienne Moret
Publisher : Springer
Release : 2021-03-30
ISBN : 9783030689155
Language : En, Es, Fr & De

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Book Description :

This book provides researchers in the fields of organic chemistry, organometallic chemistry and homogeneous catalysis with an overview of significant recent developments in the area of metal-ligand cooperativity, with a focus on pincer architectures. The various contributions highlight the widespread impact of M–L co-operativity phenomena on modern organometallic chemistry and catalyst development. The development of efficient and selective catalytic transformations relies on the understanding and fine control of the various elementary reactions that constitutes a catalytic cycle. Co-operative ligands, which actively participate in bond making and bond breaking together to the metal they support, open up new avenues in this area. In particular, buttressing a weak or reactive metal-ligand bond by flanking coordinating arms in a pincer ligand design is proving a versatile strategy to access robust metal complexes that exhibit unusual and selective reactivity patterns.

Unconventional Pincer Ligands and Their Transition Metal Complexes

Unconventional Pincer Ligands and Their Transition Metal Complexes Book
Author : Caitlin McQueen
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

This thesis describes investigations into unconventional pincer systems incorporating non-classical central donor groups. Direct reaction of 1,3-bis(diphenylphosphinomethyl)-2,3-dihydro-1H-1,3,2-benzodiazaborole (dppBH) with metal complexes and subsequent ligand manipulations have provided novel ruthenium and, for the first time, osmium boryl pincer complexes. The boryl complexes thus prepared have been observed to undergo various subsequent reactions involving the chloride and triphenylphosphine co-ligands to give new complexes. Further reactions of dppBH with complexes dichlorotris(triphenylphosphine)ruthenium(II) and -osmium(II) resulted in the first examples of sigma-borane pincer complexes, which represent intercepted intermediates in the B-H activation process, affording rare structural data for an osmium sigma-borane complex. The B-H bond of the ruthenium complex could be readily cleaved upon ligand manipulation, such as substitution of triphenylphosphine with the pi-acidic carbonyl and isocyanide ligands, which gave the disubstituted boryl complexes via spontaneous loss of HCl. Attempts to isolate a 1,8-diaminonaphthalene-based borane analogue of dppBH proved unsuccessful, though the compound 1,3 bis(diphenylphosphinomethyl)-2,3-dihydroperimidine (PhDHP) was obtained as a side-product in one case. Further investigations into this compound resulted in the development of a convenient one-pot synthesis, which could be extended to the cyclohexyl analogue 1,3 bis(dicyclohexylphosphinomethyl)-2,3-dihydroperimidine (CyDHP). These compounds were observed to react with various platinum group metal complexes to give novel N-heterocyclic carbene (NHC) pincer complexes via double geminal C-H activation of the central methylene group, providing the first examples of perimidine-based NHC inclusion as the central equatorial group of a pincer system. Reactions of dihydroperimidines with group 8 complexes dichlorotris(triphenylphosphine)ruthenium(II) and -osmium(II) have thus provided the novel pincer NHC complexes. However, reactions of PhDHP with dichlorotris(triphenylphosphine)ruthenium and CyDHP with less electron-rich ruthenium precursors instead gave asymmetric PNP coordinated complexes, in which C-H activation had not occurred, though this could be induced thermally in one case. Reactions of PhDHP and CyDHP with chlorotris(triphenylphosphine)rhodium(I) gave 16-electron chloro rhodium(I) NHC pincer complexes, and their reactivity was investigated via co-ligand manipulations and a preliminary catalytic study. The latter revealed that, while this complex was not particularly efficient for most of the reactions investigated, in some cases simple modifications of the co-ligands could substantially improve catalytic activity. Reactions of the pro-ligands with iridium precursors instead favoured the formation of coordinatively saturated complexes. The reaction of CyDHP with chlorobis(cyclooctene)iridium(I) dimer resulted in a dihydrido chloro iridium(III) NHC pincer complex, while reaction with chlorocarbonylbis(triphenylphosphine)iridium(I) instead afforded a sigma perimidinyl hydrido complex, resulting from oxidative addition of only one C-H bond to the metal centre. This was subsequently shown to readily form an NHC complex upon hydride abstraction. It became apparent that, upon reaction of the dihydroperimidine pro-ligands with metal complexes, carbene formation occurs more readily for electron-rich systems, otherwise resulting in either single or no C-H activation. These observations have provided some insight into the mechanism of NHC formation via chelate-assisted C-H activation of these precursors.

PNP Pincer Ligands and Their Late Transition Metal Complexes in the Context of Strong Bond Activation and Catalysis

PNP Pincer Ligands and Their Late Transition Metal Complexes in the Context of Strong Bond Activation and Catalysis Book
Author : Lei Fan
Publisher : Unknown
Release : 2006
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download PNP Pincer Ligands and Their Late Transition Metal Complexes in the Context of Strong Bond Activation and Catalysis book written by Lei Fan, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Transition Metal Complexes of Bis carbene pyridine pincer Ligands

Transition Metal Complexes of Bis carbene pyridine  pincer  Ligands Book
Author : David Charles Pugh
Publisher : Unknown
Release : 2008
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Transition Metal Complexes of Bis carbene pyridine pincer Ligands book written by David Charles Pugh, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Zeitschrift F r Naturforschung

Zeitschrift F  r Naturforschung Book
Author : Anonim
Publisher : Unknown
Release : 2007
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Zeitschrift F r Naturforschung book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Late Transition Metal Complexes of Pentafluorophenylphosphino pincer Ligands

Late Transition Metal Complexes of Pentafluorophenylphosphino pincer Ligands Book
Author : Bradley George Anderson
Publisher : Unknown
Release : 2012
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Late Transition Metal Complexes of Pentafluorophenylphosphino pincer Ligands book written by Bradley George Anderson, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

The Development of Next Generation Unsymmetrical CCC NHC Pincer Ligand Architectures and Metalation to Form Unsymmetrical CCC NHC Pincer Ta Complexes

The Development of Next Generation  Unsymmetrical CCC   NHC Pincer Ligand Architectures and Metalation to Form Unsymmetrical CCC   NHC Pincer Ta Complexes Book
Author : Hannah Killian Box
Publisher : Unknown
Release : 2015
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

The impact of N-heterocyclic carbenes (NHC) as ligands for transition metal catalysis has been rigorously investigated since their isolation by Arduengo in 1991. have become abundant in late-transition metal chemistry. This is attributed to NHCs being stronger sigma-donors than even the strongest phosphine analogues, thus constructing a transition metal-NHC complex with improved stability, catalytic reactivity, and selectivity. Additionally, pincer ligands have become recognized as an important class of ligands for transition metal complexes. The unique steric and tunability of pincer ligands has resulted in pincer-transition metal complexes being exploited as catalysts for a multitude of transformations. Both ligand classes, NHC and pincer, have been reported as stable organometallic catalysts that demonstrate high catalytic activity. The combination of these two ligand systems by incorporation of NHCs into pincer ligands has attracted considerable attention. NHC pincer systems have been reported as stable organometallic catalysts that demonstrate high catalytic activity. The expansion of CCC-NHC ligand precursor methodologies and application of the newly reported methodologies in order to diversify CCC-NHC ligand architectures is reported. Extension of the amine elimination methodology yielded unsymmetrical CCCNHC Ta pincer complexes. Studies on the manipulation of the previously reported symmetrical CCC-NHC pincer Ta complex’s coordination sphere to synthesize a rare Ta diimido complex with unique reactivity towards advantageous proton sources and oxidative amination of aminoalkenes are also expanded upon. These next generation catalysts developed from these architectures may prove useful in catalyzing a broad array of transformations not previously accessible through the four standard NHC containing pincer ligand architectures.

Late Transition metal Complexes Supported by Pincer Ligands

Late Transition metal Complexes Supported by Pincer Ligands Book
Author : Wilson D. Bailey
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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.

Current Organic Chemistry

Current Organic Chemistry Book
Author : Anonim
Publisher : Unknown
Release : 2009
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Provides in depth reviews on current progress in the fields of asymmetric synthesis, organometallic chemistry, bioorganic chemistry, heterocyclic chemistry, natural product chemistry, and analytical methods in organic chemistry. Each issue is edited by an appointed Executive Guest Editor

Molecular Recognition and Polymers

Molecular Recognition and Polymers Book
Author : Vincent Rotello,Sankaran Thayumanavan
Publisher : Wiley
Release : 2008-09-02
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

State-of-the-art techniques for tapping the vast potential of polymers The use of specific non-covalent interactions to control polymer structure and properties is a rapidly emerging field with applications in diverse disciplines. Molecular Recognition and Polymers covers the fundamental aspects and applications of molecular recognition—in the creation of novel polymeric materials for use in drug delivery, sensors, tissue engineering, molecular imprinting, and other areas. This reference begins by explaining the fundamentals of supramolecular polymers; it progresses to cover polymer formation and self-assembly with a wide variety of examples, and then includes discussions of biomolecular recognition using polymers. With chapters contributed by the foremost experts in their fields, this resource: Provides an integrated resource for supramolecular chemistry, polymer science, and interfacial science Covers advanced, state-of-the-art techniques used in the design and characterization of non-covalent interactions in polymers Illustrates how to tailor the properties of polymeric materials for various applications Stand-alone chapters address specific applications independently for easy reference. This is a premier resource for graduate students and researchers in polymer chemistry, supramolecular chemistry, materials science, and physical organic chemistry.