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Showing 1 to 20 of 58 for “"Borane"”.
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Chemical and electrochemical studies of Borane Anions and Metallaboranes
… oxidative stability of the anions varied. Metallaboranes of some of these anions have been prepared by anodic dissolution of a suitable metal in a solution of the anion. The structures and dynamics of substituted derivatives of the [B₉H₁₄]⁻ ion have been studied. The anions [B₉H₁₃(X)⁻(X = CINCSe, …
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A study of activated ketal reduction with borane dimenthyl sulphide
… a study of a novel reagent combination, namely borane dimethyl sulphide and trimethylsilyl trifluoromrthanesulphonate (TMSOTf) for reductive ketal cleavage.
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The Development of New Routes to Half-Sandwich Metallatricarbadecaborane Complexes, Triflate-Functionalized Polyboranes and Carboranes, and Ammonia Borane Hydrogen Release
… series of half-sandwich metallatricarbadecaborane complexes, (2) to synthesize and explore the reactivity of 5-TfO-B10H13, and (3) to investigate metal-catalyzed hydrogen release from ammonia borane in ionic liquids. The major achievements are outlined below. Chapter 1 describes the …
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Synthesis and Characterization of Highly Porous Borazine-Linked Polymers via Dehydrogenation/Dehydrocoupling of Borane-Amine Adducts and Their Applications to Gas Storage
… dehydrogenation of several polytopic arylamine-borane adducts and has been designated Borazine-Linked Polymers (BLPs). The polymers reported are constructed of linear, triangular, and tetrahedral amine building units to form 2D and 3D frameworks. The boron sites of the pores are aligned with …
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Solid amine-boranes as high performance hypergolic hybrid rocket fuels
… It has been found that the addition of a borane adduct to an amine fuel tends to reduce the ignition delay by up to an order of magnitude with white fuming nitric acid (WFNA). The borane addition has resulted in fuels with very short ignition delays between 2-10 ms - the fastest times for …
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Borenium Cations as Catalysts for the Reduction of Organic Molecules and Mechanistic Investigations into their Mode of Operation
… diazabicyclo[2.2.2]octane (DABCO) with pinacol borane (HBpin) resulted in the activation of the B–H bond of HBpin and formation of a stable borenium cation/borohydride salt. This stable salt was used as a catalyst in the hydroboration reaction. It was shown to catalytically reduce a wide array …
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Developing hydrogen oxidation electrocatalysts using a frustrated Lewis pair approach
… archetypal Lewis acid, tris(pentafluorophenyl)borane, was undertaken in low donor strength solvents. This allowed pertinent thermodynamic, kinetic and mechanistic information to be obtained. The redox chemistry of the archetypal FLP system, tris(pentafluorophenyl)borane/tri-t-butylphosphine, …
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Spectroscopie infrarouge à haute résolution : Mise au point d'un spectromètre, de la méthode d'analyse des spectres et interprétation de certaines bandes de vibration-rotation du borane-carbonyle
Les résultats inclus dans ce travail ont deux aspects. D'abord les modifications apportées au spectromètre de haute résolution sont décrites. L'instrument est maintenant en double passage et permet d'obtenir une résolution de 0.022 cm-1. Une nouvelle source a été construite et les détecteurs ont …
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Synthesis of P-Stereogenic Bisphosphine Ligands: Application as Hemi-labile Ligands in the Asymmetric Pauson-Khand Reaction
… lithiation of a phosphine sulfide or a phosphine borane using alkyllithium/()-sparteine complexes, trapping with Ph2PCl or t-Bu2PCl and treatment with BH3•Me2S or sulfur. This gave P-stereogenic bisphosphines. To afford highly enantioenriched ligands, the bisphosphines were recrystallised to …
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EXPLORING NOVEL SUSTAINABLE SYNTHETIC METHODOLOGIES WITH NITRO COMPOUNDS
… the reduction of nitroolefins employing ammonia borane as reductant, the enantioselective reduction of β,β-disubstituted nitroalkenes in deep eutectic solvents, the preliminary investigation of other enantioselective nitroalkenes reductions catalyzed by chiral organocatalysts and the study of …
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Boron in the primary and secondary coordination spheres of iron and nickel
… ligands, a new, neutral tris(phosphine)borane scaffold was prepared. The synthesis, spectroscopy and solid-state structures of iron complexes ligated by both [pi]-acidic and [pi]-basic moieties are presented. The cationic imido complex, [[TPBPh]FeNAd]- [BAr4] ([TPBPh = (2Ph2PC6H4 )3B, …
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6- and 5-Halodecaboranes: Selective Syntheses From ClOSO-B10H10(2-) and Use as Polyborane Building Blocks
Decaborane halogenated in the 6-position has been synthesized in high yields via the super-acid induced cage-opening reactions of closo-B10H10(2-) salts. These 6-halogenated compounds were then isomerized to their 5-substituted isomers through base catalysis. The isomerization was driven by the …
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Catalytic hydroboration: a study of model hydridoiridium and hydridorhodium boron complexes
… addition of the B-H bond in (1,2-phenylenedioxy) borane (catecholborane) to (Me₃P)₃Ir(Cl)(H) (BO₂C₆H₄ (<B>II</B>) produces <i>mer</i>-(Me₃P}₃Ir(Cl)(H)(B0₂C₆H₄) (<B>II</B>), which was characterized by ¹H NMR spectroscopy and single crystal X-ray diffraction. Compound <B>II</B> reacted with alkynes …
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Quantum Chemical Studies of Macropolyhedral Boranes and Related Clusters
… zwar in 11-Vertex nido- und 12-Vertex closo- Carboranen, -Heteroboranen und -Carbaheteroboranen sowie 12-Vertex closo- Cyclopentadienylmetallacarboranen. Sie reproduzieren die relativen Stabilitäten wie sie aus Dichtefunktional-Rechnungen resultieren sehr genau. Bemerkenswerterweise können die …
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Fluorinated boranes in dehydrocoupling and hydroboration
… adducts of mono- and bis-(pentafluorophenyl)borane (LB·BHn(C6F5)3−n; n = 1, 2; LB = SMe2, NH3) as it applies to the development of novel perfluoroarylboranes. Chapter 2 details the use of Me2S·BHn(C6F5)3−n in the preparation of the pentafluorophenyl substituted amine borane adducts, …
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Chemistry of B1- and B10- boranes containing halogen or pseudohalogen groups
… in this thesis involved the chemistry of borane-species which contain one or more halide or pseudohalide groups. Both monoboron species e.g. [BH3X]- and "cluster" borane species e.g. [B10H9X]2- and I-Se B11H10 were studied. The first chapter is a review of the syntheses, properties and …
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Metal-containing and Metal-free systems for small molecule activation
… catalyze the hydroboration of CO2 with a wide borane scope. In Chapter 3, a possible intermediate from the catalytic cycle was isolated and it partly revealed the mechanism of the catalytic reaction.
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Electroactive Conjugated Polymers as Charge-Transport Materials for Optoelectronic Thin-Film Devices
… and photophysical properties of the triarylborane monomers were studied in detail in order to estimate possible influences on the behaviour of the corresponding polymer. The first part of this work aimed at the synthesis and investigation of conjugated donor–acceptor polymers which combine …
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Investigations Of Noncovalent Interactions Using Raman Spectroscopy And Electronic Structure Computations
… specifically dihydrogen bonding) in ammonia borane clusters.
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