Download or read book Synthesis and Reactivity of Low Valent Main Group Element Complexes written by Terry Chu and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Reactivity of Low Valent Main group Compounds written by Clément René Paul Millet and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reactivity of Low Valent Group 14 Species Toward Main Group Element Transition Metal and Lanthanide Compounds written by Xiaofei Sun and published by Cuvillier Verlag. This book was released on 2022-08-22 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die Dissertation befasst sich mit der Anwendung von niedervalenten Gruppe-14-Verbindungen in metallorganischer Chemie und Hauptgruppenchemie. Ausgehend von mono- und divalenten Siliziumverbindungen wurde die analoge Siliziumverbindung des 2π-Hückel-aromatischen Verbindung dargestellt (Kapitel 3.1). Ein chirales Silen wurde synthetisiert und weitere Reaktivität mit unterschiedlichen kleinen Molekülen untersucht (Kapitel 3.2). Außerdem wurden bidentate Silylene als Liganden zur Stabilisierung von Seldenerdelementen, Erdalkalielementen und Gruppe-12-Metallen eingesetzt (Kapitel 3.3-3.4). Verschiedene Polyphosphide wurden aus reduzierenden Silylenen oder Plumbolen generiert (Kapitel 3.5-3.6). Die dianionischen Gruppe-14-Metallole, Silol, Germol und Plumbol wurden als Liganden für sandwichartige Lanthanidkomplexe eingesetzt und die magnetischen Eigenschaften der Er-Verbindung wurden untersucht (Kapitel 3.7-3.8).

Download or read book Synthesis and Reactivity of Low Valent Group 13 and 14 semi metal Complexes written by and published by . This book was released on 2015 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Heterometallic Zinc Gold and Lanthanide Transition Metal Carbonyl Complexes and Reactivity Study of Pentaphosphaferrocene Towards Low Valent Main Group Species written by Ravi Yadav and published by Cuvillier Verlag. This book was released on 2019-11-27 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work reported in this thesis is divided into three parts. In the first part, the synthesis of Zn-Au heterometallic complexes is described by using bifunctional carboxy-phosphine ligands. The second part of this thesis focuses on redox reactions between divalent lanthanides (LnII) and transition metal (TM) carbonyl complexes for the synthesis of high nuclearity heterometallic complexes. The third and final part of this thesis focuses on reactivity studies of [Cp*Fe(Л5-P5)] with lowvalent main group compounds.

Download or read book Synthesis and Reactivity of Low Valent Transition Metal Alkoxides and Related Compounds written by Kathryn Mary Sanchez and published by . This book was released on 1988 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Reactivity of Main Group Complexes for Applications in Small Molecule Activation written by Minh Tho Nguyen and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The work described in this thesis is focused on the preparation of a series of novel main group complexes, featuring unusual structural and bonding situations, and the study of their reactivity toward small molecules. The new zinc complexes dimphZnBu (V-2) and dimphZnCl2Li(THF)3 (V-3), supported by a diiminophenyl (dimph) ligand were prepared. The reaction of complex V-3 with LiHBEt3 resulted in hydride transfer to the C=N imine group to give an unusual zinc dimer (V-7). The latter transformation occurs via formation of compound (ɳ1(C),ĸ1(N)- 2,6-(2,6-iPr2C6H3N=CH)2C6H3)2Zn (V-5) which can be also accessed by reduction of V-7 with KC8. Diiminophenyl (dimph) proved to be an excellent ligand platform to stabilise a low-valent phosphorus centre. The resultant compound dimphP (VI-2), which can be rationalised as an imino-stabilised phosphinidene or benzoazaphopshole, shows remarkable chemical stability toward water and oxygen. VI-2 reacts with excess strong acid HCl to generate the P(III) chloride (dimHph)PCl (VI-6). Surprisingly, substitution of the chloride under some nucleophilic (KOBut) and electrophilic conditions (Me3SiOTf) regenerates the parent compound VI-2 by proton removal from the weakly acidic CH2N position. A related species (dimH2ph)P (VI-10) is produced upon thermal rearrangement of the hydride (dimHph)PH (VI-9). The molecular structure and reactivity of compounds VI-2 and other related compounds are also discussed. The reduction of the O,C,O-chelated phosphorus (III) chloride (VI-16) ( O,C,O = 2,6-bis[(2,6-diisopropyl)phenoxyl]phenyl) with KC8 or PMe3 resulted in the formation of a cyclic three-membered phosphorus compound (VI-18). The intermediacy of phosphinidene VI-17 was confirmed by trapping experiments and a VT 31P{1H} NMR study. The reaction of in-situ generated phosphinidene with either PhSiH3 or HBpin resulted in the formation of an unprecedented phosphine (VI-23). The treatment of VI-16 with two equivalents of DippNHC carbene led to ArP(Cl)NHC product (VI-24). The germylone dimNHCGe (dimNHC = diimino N-Heterocyclic Carbene, VII-8) was successfully prepared by the reduction of germanium cation (VII-7) with KC8. The molecular structure of VII-8 was unambiguously established, using NMR spectroscopy and single-crystal X-ray diffraction analysis. The reactivity of VII-8 was investigated. VII-8 is inactive towards butadiene but undergoes an oxidative cyclization with tetrachloro-o-benzoquinone to give a tetragermanium derivative. VII-8 undergoes oxidation addition of CH3I and PhI, followed by an unusual migration of the Me and Ph groups from germanium to the carbene ligand. Related chemistry takes place upon protonation with dry HCl, which results in the migration of the hydride to the carbene ligand.

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 Synthesis Characterization and Reactivity Studies of Low valent 3d Metal Complexes with N Heterocyclic Carbene and Diimine Ligands written by Stefan Pelties and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis Characterisation and Reactivity of Low valent and Hypercoordinate Azido Triazenido and Nitrato Complexes of Group 14 and Group 15 Elements written by B. Peerless and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Reactivity of Low Valent Group 14 15 Compounds written by Nicholas Allan Giffin and published by . This book was released on 2012 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low valent Group 14 Metal Containing Ligands written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Synthesis and Stabilisation of Low Oxidation State Complexes Utilising Magnesium I Dimers as Reducing Agents written by Simon James Bonyhady and published by . This book was released on 2013 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis pertains to the synthesis and stabilisation of low oxidation state main group element complexes through the utilisation of novel magnesium(I) dimers as reducing agents. As such, it is an exploration of the utility of these magnesium(I) complexes in organometallic synthesis and has resulted in the isolation of a number of compounds featuring unusual structural motifs, oxidation states and bonding modes.Chapter 1 provides a general introduction to low oxidation state main group chemistry and discusses a number of concepts that are unique to this field of study. Particular attention is paid to historical concepts such as the "double bond rule" and the new understanding of chemical bonding that has developed as a result of this "renaissance" in main group chemistry, as well as a general discussion of synthetic methods to access these compounds.Chapter 2 introduces the magnesium(I) dimers reported to date and details both their synthesis and reactivity in organic and organometallic synthesis. Two new [beta]-diketiminato magnesium(I) complexes are described, along with their [beta]-diketiminato magnesium(II) halide precursor complexes, and efforts towards improving the synthesis of these unusual compounds are outlined. A number of other novel [beta]-diketiminato magnesium(II) hydride, alkyl and halide complexes are also presented. Finally, efforts towards the synthesis of soluble models of magnesium amido-boranes, in which this library of magnesium(I and II) complexes is exploited, are also discussed.Chapter 3 presents a case study into the utility of magnesium(I) dimers as reducing agents in organometallic synthesis. A series of amidinato group 14 element(I) dimers [LEEL] (E = Si, Ge, Sn; L = amidinate) were synthesised in high to moderate yield, and comparisons between the magnesium(I) dimers and traditional reducing agents emphasised the efficacy of the magnesium(I) dimers in this role. The tin compound is the first of its type, while one and two previous examples exist for the silicon and germanium complexes, respectively, although they were only isolated in low yield.Chapter 4 describes the development of low oxidation state aluminium hydride chemistry, an area in which magnesium(I) dimers have been instrumental. A number of novel compounds are presented including of a series of compounds which feature remarkable [Al6H6] octahedral cores.Chapter 5 details efforts to extend the use of magnesium(I) dimers to compounds stabilised by bulky terphenyl ligands. The preparation of the second example of a diplumbyne, for which a moderate yielding synthesis was determined, is described. A dialumene and a disilyne were also desirable synthetic targets, and efforts to these ends are also outlined.Finally, Chapter 6 provides a summary of the results presented in this thesis.

Download or read book Studies of Low Oxidation State Group 14 Complexes and Their Reactivity Towards Small Molecules written by Jiaye Li and published by . This book was released on 2013 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis concerns research into the synthesis of low oxidation state group 14 complexes and their reactivity towards small molecule activation. A number of group 14 complexes in the +1 or +2 oxidation states have been synthesized. These include the first singly-bonded amido germanium(I) complex (amido-digermyne, [LGeGeL], L = {N(MeAr)(SiMe3)}, MeAr = C6H2{C(H)Ph2}2Me-2,6,4), amido group 14 metal(II) halide complexes, e.g. [LECl] (E = Ge, Sn or Pb, SiR3 = SiMe3, SiPh2Me or SiPh3), and amido silicon(IV) halide complexes, e.g. [LSiX3] (X = Cl or Br). The reactivity of the amido digermyne towards a variety of small molecules, e.g. H2, CO2, N2O, CS2, alkynes, etc., has been examined. In addition, the synthesis of "one-coordinate" group 14 metal(II) monocationic complexes (e.g. [LE]+[PF]-, E = Ge or Sn, PF = [Al{OC(CF3)3}4]- ) has been investigated and their reactivity towards Lewis base molecules has been examined. Work included in this thesis can be divided into six chapters. Chapter 1 introduces recent developments in main group chemistry, bonding in low oxidation state main group compounds, kinetic stabilization, and the "inert pair" effect. Some examples of low oxidation state main group complexes are described.Chapter 2 introduces the synthesis and coordination chemistry of a series of bulky secondary amines, [(MeAr)(SiR3)NH], [(iPrAr)(SiMe3)NH] (iPrAr = C6H2{C(H)Ph2}2iPr-2,6,4) and [(tBuAr)(SiR3)NH] (tBuAr = C6H2{C(H)Ph2}2tBu-2,6,4). Subsequently, the chapter discusses the synthesis of amido group 14 metal(II) halide complexes, e.g. [LECl] (E = Ge, Sn or Pb; SiR3 = SiMe3, SiPh2Me or SiPh3), [{(iPrAr)(SiMe3)N}ECl] (E = Ge or Sn) and {(tBuAr)(SiMe3)N}GeCl. The structures of these complexes have been determined using X-ray crystallography. Furthermore, amido silicon(IV) halide complexes, [LSiX3] (SiR3 = SiMe3, SiPh2Me or SiPh3; X = Cl or Br) and [{(iPrAr)(SiR3)N}SiBr3], as well as an amido silicon hydride, [LSi(H)Cl2] have been synthesized and structurally investigated. Chapter 3 discusses the synthesis and structural characterization of the first singly-bonded amido-digermyne, [LGeGeL], and its reactivity towards small gas molecule activation, e.g. that of H2, CO2, N2O, etc. at ambient and low temperatures. These reactions produced bulky amido germanium(II) and germanium(III) hydride complexes, and a bis(germylene) oxide complex. Further efforts have been devoted to the reactivity of [LGeGeL] towards molecules such as CS2, tBuNC and tBuNCO. Chapter 4 expands on the reactivity of [LGeGeL] and [L#GeGeL#] (L# = (iPrAr)(SiiPr3)N). It describes reactions that have been carried out with organic molecules, e.g. cyclooctatetraene (COT), 4-dimethylaminopyridine (DMAP), azobenzene, 1,4-bis(trimethylsilyl)butadiyne, norbornadiene, etc. These reactions produced a number of low oxidation state germanium complexes. In general, the reactions of [LGeGeL] and [L#GeGeL#] with unsaturated molecules produced products with the substrate inserted into the Ge-Ge bond. However, the reaction with DMAP produced a bis-adducted germanium complex with a shortened Ge-Ge bond. Finally, reactions of [LGeGeL] with chlorinated compounds, iodine, and ketones are discussed. Chapter 5 summarizes investigations into the synthesis and coordination chemistry of the first examples of bulky amido "one-coordinate" germanium(II) and tin(II) monocationic complexes, [LE]+[PF]- (E = Ge or Sn, PF = [Al{OC(CF3)3}4]-) and [L'Sn]+[PF]- (L' = [(MeAr)(SiPh2Me)N]). Their reactivity towards DMAP was investigated, and this led to two-coordinate adducted germanium or tin cationic complexes. Chapter 6 summarizes miscellaneous results, and consists of two sections. The first section discusses theoretical investigations into the Mo-Ge bonding of singly-bonded or triply-bonded molybdenum germylene and germylyne complexes. Wiberg bond indices (WBI) were acquired to provide a quantitative description of the bonding in these complexes. The second section focuses on investigations into the synthesis of a bulky gallium(I) amide complex, [LGa:], which was prepared from the reaction of [{(MeAr)(SiMe3)N}Li] and "GaI". X-ray crystallographic studies of [LGa:] were carried out and indicate that the complex is essentially one-coordinate.

Download or read book Frustrated Lewis Pairs II written by Gerhard Erker and published by Springer. This book was released on 2013-12-12 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frustrated Lewis Pairs: From Dihydrogen Activation to Asymmetric Catalysis, by Dianjun Chen, Jürgen Klankermayer Coexistence of Lewis Acid and Base Functions: A Generalized View of the Frustrated Lewis Pair Concept with Novel Implications for Reactivity, by Heinz Berke, Yanfeng Jiang, Xianghua Yang, Chunfang Jiang, Subrata Chakraborty, Anne Landwehr New Organoboranes in "Frustrated Lewis Pair" Chemistry, by Zhenpin Lu, Hongyan Ye, Huadong Wang Paracyclophane Derivatives in Frustrated Lewis Pair Chemistry, by Lutz Greb, Jan Paradies Novel Al-Based FLP Systems, by Werner Uhl, Ernst-Ulrich Würthwein N-Heterocyclic Carbenes in FLP Chemistry, by Eugene L. Kolychev, Eileen Theuergarten, Matthias Tamm Carbon-Based Frustrated Lewis Pairs, by Shabana Khan, Manuel Alcarazo Selective C-H Activations Using Frustrated Lewis Pairs. Applications in Organic Synthesis, by Paul Knochel, Konstantin Karaghiosoff, Sophia Manolikakes FLP-Mediated Activations and Reductions of CO2 and CO, by Andrew E. Ashley, Dermot O’Hare Radical Frustrated Lewis Pairs, by Timothy H. Warren and Gerhard Erker Polymerization by Classical and Frustrated Lewis Pairs, by Eugene Y.-X. Chen Frustrated Lewis Pairs Beyond the Main Group: Transition Metal-Containing Systems, by D. Wass Reactions of Phosphine-Boranes and Related Frustrated Lewis Pairs with Transition Metal Complexes, by Abderrahmane Amgoune, Ghenwa Bouhadir, Didier Bourissou

Download or read book The Synthesis Reactivity and Electrochemical Study of Metallocene Substituted Diimine Ligands written by Eleanor Magdzinski and published by . This book was released on 2013 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of transition metal complexes containing redox-active ligands or ligands with redox-active substituents have been areas of ongoing interest in chemical research. To date, only a handful of examples involving redox-active ligands containing main group centres have been reported. This thesis presents work on the development of novel redox-active ligands utilizing an assortment of nitrogen-based frameworks (diiminopyridine (DIMPY), 1,4-diaza-1,3-butadiene (DAB), N-heterocyclic carbene (NHC)) that contain metallocene substituents (ferrocene and an understudied redox-active Co(III) moiety). Initially the syntheses of an N, N'-differocenyl diiminopyridine and its low-valent chalcogen (S2+, Se2+, Te2+) and pnictogen (P+) complexes are discussed. These complexes represent the first such examples of utilizing low-valent main group systems containing redox-active ligands with pendant ferrocenyl substituents. Other work focuses on the synthesis of the above listed nitrogen-based ligands containing novel mixed sandwich Co(III) substituents, and include comparative reactivity studies (SnCl2 and GeCl2.dioxane for DIMPY and SnCl4 and Pt2Me4(SMe2)2 for DAB) of those ligands to their ferrocene derivatives. Electrochemical studies reveals an instability of the Co(III) containing complexes, leading to the continuous variation in the ligand framework towards a more stable compound.

Download or read book Main Group Metals in Organic Synthesis written by Hisashi Yamamoto and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 905 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first handbook to cover in detail all aspects of this fascinating field of chemistry. In this handy two-volume set, readers will instantly find the information they need, clearly structured according to the individual metals in the main groups, hitherto only accessible after much time-consuming research. The result is in indispensable aid for everyday work in the lab. Alongside all the classical organic reactions, this book focuses on the modern variations as well as novel, current reactions in organic synthesis that are closely linked to main group elements - both stoechiometric and catalytic. With this work the two prizewinning editors have succeeded in producing a comprehensive compendium of the main group metals as reagents for organic reactions. In short, this is a must for every organic chemist, whether as an efficient introduction to current research, for retaining an overview or for looking up detailed information.