Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 83 for “"Main group"”.
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Ionic liquids for main group catalysis
… 1 Despite their popularity, this archetypal group of catalysts faces two key challenges: the use of an expensive organic cation which plays no role in the catalytic process and placing the Lewis acidic function on the chloroaluminate anion, which does not allow for further modification of …
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Development of Main Group Systems for Small Molecules Activation
… we showed compounds contain covalently bonded group 13 and 15 elements remain reactive towards CO2 activation. For example, indium amide systems (R2In-NR’2) are shown to readily activate CO2 and has been developed as catalysts for the synthesis of 1,3-disubstituted ureas.
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Sulfur Rich Transition Metal-Main Group Heterocycles and Cages
The reactivity of elemental sulfur homocycles has long been postulated to occur via highly reactive thiopolysulfide (S=S) ring intermediates. Consistent with the reactivity associated with these postulated S=S intermediates is that observed for the organoperthiophosphinic acid anhydrides, …
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Fluoroalkoxy-functionalized carbenes for main group and transition metal complexes
… for their applications as ligands for main group elements and transition metals and as sterically hindered Lewis bases for hydrogen activation. Chapter 1 reviews the background of carbenes as ligands for main group compounds and transition metal complexes. The history and development of …
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Synthesis and Reactivity of Low Valent Main Group Element Complexes
The β-diketiminate aluminum(I) complex NacNacAl (III-1) was shown to activate a range of substrates containing robust single and double bonds. Compound III-1 oxidatively adds a variety of H–X bonds (X = H, B, Al, C, Si, N, P, O) to give a series of four-coordinate aluminum hydride derivatives …
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Electrosynthesis and characterization of main group and transition metal oxides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1994.
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Novel metal- and main group-catalyzed methods for modulating molecular oxygenation
Synthetic methodologies frequently rely on oxygen functionality as a synthetic handle to enable structural modification of organic molecules; therefore, methods that enable new ways to modulate oxygen content in molecular structure facilitate structural diversification. This thesis details the …
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Synthesis and characterization of new layered main group-transition metal oxides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1994.
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Stabilisation effects of ferrocenylalkyl groups on hydrides of heavier main group elements
New hydrides of heavier p-block main group elements with a ferrocenylalkyl moiety, Fc(CH₂)nEHm (Fc = (CpFeC₅H₄-); E = P, As, Si, Ge or Se; n = 1, 2, 4, 6 or 11; m = 1, 2 or 3) and FcCH₂P(R)H (R = CH₃, C₆H₁₁ or p-CH₂C₆H₄NO₂), have been synthesised and characterised. Although some precursors of the …
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New developments in main group chemistry for application in modern battery technology
… trend towards π bonding increasing on descending group 1. Here we review known alkali metal structures of diphenylmethane, fluorene, 2-benzylpyridine and 4-benzylpyridine. Next, we synthesise Li, Na, K monomers of these diarylmethyls using polydentate donors PMDETA or Me6TREN to remove competing …
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Main Group Hydrogen-Bond Donors and Pyridyl Ligands for Supramolecular and Coordination Chemistry
The thesis involves the investigation of two main areas in which new ligands based on main group frameworks are developed. In the first part of this thesis we explore the host-guest chemistry of a range of non-carbon frameworks based on P-N bonds. In the first chapter we develop strategies for …
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Main Group Elements in Catalysis: Alkene/Alkyne Activation Using Organoaluminium(III)–Pyridyl Dimers
… py')]2 (R = Me, iBu; py'= substituted pyridyl group), which have been previously shown to be involved in a unique “pyridyl ring-flipping” (cis/trans isomerism) equilibrium. Five new dimers of the type [R2Al(2-py')]2 (R = Me, iBu; py' = substituted pyridyl group) with different substituents on …
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Bimetallic Main-Group Catalysts for the Synthesis of Advanced Biocompatible, Biodegradable, and Sustainable Polymers
… and the development of both neutral and cationic main-group bimetallic complexes, specifically dilithium and dizinc species. These complexes were employed as catalysts in the ring-opening polymerization (ROP) of lactide. Furthermore, both random and block copolymerizations of lactide with …
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Preparing Main Group Metal Clusters from Organoaluminium Reagents; New Possibilities in Alkali-Activated Polymer Crosslinking
… solid state by X-ray diffraction methods and two main motifs were observed. When the acid and AlR3 reacted in a one-to-two stoichiometry the obtained products, [iBu4Al2(μ-O2CC6H4-2-μ- O)]2, [(Me2Al)2(μ-O2CC6H4-2-μ-NH)]2, [(iBu2Al)2(μ-O2CC6H4-2-μ-NH)]2, [(Me2Al)2(μ- O2CC6H4-2-μ-NMe)]2 and …
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Bond length and bonded radii variations in sulfide molecules and crystals containing main group elements
… on 18 hydrosulfide molecules containing selected main group X-cations yield minimum energy bond lengths, R<sub>t</sub>(XS), that reproduce those observed in chemically similar sulfide crystals. A least-squares analysis shows that R<sub>t</sub>(XS) can be estimated by the equation R = …
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The Effects of Main Group Elements on Transition Metal Carbonyl Clusters (Tellurium, Assembly, Chalcogen, Sulfur, Ditelluride)
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986.
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