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 37 for “"Group transfer"”.
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Nitrogen-Oxidants Enable Group-Transfer Reactions
… (C–H) bonds into value-added diverse functional groups. Such technologies streamline access to complex molecules. In recent years, nitrogen-centered oxidants have garnered significant attention as a result of their ability to engage in selective and predictable synthetic transformations of these …
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HYPERVALENT IODINE-MEDIATED HETEROCYCLIC GROUP TRANSFER REACTIONS TO OXIDATIVE OLEFIN DIFUNCTIONALIZATION
… novel class of reagents serve as “heterocyclic group transfer reagents,” incorporating diverse pyridinium salts under mild conditions and in excellent yields. Heterocyclic Group Transfer reactions have resulted in new classes of pyridinium salts that can be further functionalized via simple …
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Zinc polysulfides as precursors to zinc sulfide and as group transfer reagents
In the first part of the thesis, reactions of zinc powder with solutions of elemental sulfur in various donor solvents are described. Complexes of the type $\rm ZnS\sb6$(N-donor)$\sb2$ are obtained for the ligands tetramethylethylenediamine (TMEDA), N-methylimidazole (MeIm), and …
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Synthesis, characterization and kinetic investigations of heterophase materials prepared using group transfer polymerization
… for the preparation of blocks and grafts. Group Transfer Polymerization (GTP) is a relatively new synthetic method which provides a means to obtain poly(alkyl acrylate)s and poly(alkyl methacrylate)s via a "living" mechanism over a broad temperature range. The degree of control over …
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A Diverse Array of Synthetic Strategies for Phosphorus Group Transfer Chemistry: From Phosphinidenes to Phosphates
… development of novel synthetic methods for the transfer of phosphorus-containing moieties, specifically metaphosphates and phosphinidenes. The work presented here has significant implications for both the fundamental understanding and practical advancement of synthetic inorganic and organic …
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Redox-sensitive enzyme activities involved in methyl group transfer and coenzyme F420 conversion in Methanobacterium thermoautotrophicum
Contains fulltext : mmubn000001_111343151.pdf (Publisher’s version ) (Open Access)
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Total synthesis of ferrugine and synthetic studies towards ferrugine and stemofoline
… onto an unactivated pendant alkene, followed by group transfer of the dithiocarbamate moiety. The carbamoyl radical cyclisation precursor was synthesised from a known seven-membered ring carboxylic acid. The diastereomeric dithiocarbamates converged to a single alkene upon thermal elimination. …
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Enantioselective, Lewis base-catalyzed transformations: I. Polyene sulfenocyclization (preparative and mechanistic aspects) II. Sulfenofunctionalization of alkenyl boronates enabled by 1,2-boronate migration
… of polyenes (Chapter 2). Sulfenyl group transfer from a highly reactive, cationic, Lewis acid-base adduct to an unactivated alkene generates a cyclic thiiranium ion, which serves as the initiating event for a highly stereoselective polyene cyclization that is terminated by arenes or …
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Zinc enzyme model complexes with Ligands containing a N2S Donor Set and their methylating reactions
… with those methylating reagents. The methyl <br>group transfer occurs like in the enzymatic processes.
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Intra- and intermolecular reactivity of organic diacyl systems
The mechanism or a thermal amino group transfer-fragmentation reaction yielding carboxyamides from mixed phosphoric-carboxylic anhydrides (RO(R¹R²N)P(O)OC(O)R³; R = R¹ = alkyl; R² = H, alkyl, aryl; R³ = alkyl, aryl) was elucidated from structure reactivity studies using a model system, R = R¹ = R² …
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Well defined graft copolymers and end functional materials: synthesis, characterization and adhesion studies
… two living polymerization methods, anionic and group transfer, for the synthesis of well defined end functional materials and graft copolymers. Group transfer polymerization was utilized to synthesize acrylic terminal poly(methyl methacrylate) (PMMA) macromonomers of controlled molecular weight …
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Fungal biotransformation of morphine alkaloids
… not involve O-demethylation followed by methyl group transfer as suggested in previous studies.
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Investigations of the chemistry of taxol
… some interesting rearrangements and functional group transfer reactions.
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Entwicklung neuer Methoden zur Eisen-katalysierten Kohlenstoff-Heteroatom-Bindungsknüpfung
… the aziridination reaction of olefins by nitrene group transfer. Commercial Fe(acac)3 served as the iron source. The nitrene was formed in situ from an aromatic sulfonamide and a hypervalent iodine compound under basic conditions. The conversion of various aromatic olefins gave moderate yields. …
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Purification, characterization and substrate specificity of a nuclear mRNA (Guanine-7)-Methyltransferase from Ehrlich ascites cells
… of translation. A RNA (guanine-7)-methyltransferase that specifically methylates the 5'-terminal guanosine residue of the RNA cap structure has been purified about 280-fold from the nucleoplasm of Ehrlich ascites cells. This enzyme activity was elevated eight fold in Ehrlich ascites tumor …
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Synthese und kolloidale Eigenschaften neuartiger Blockcopolymere mit beta-Dicarbonyl Einheiten = Synthesis and colloidal properties of a novel type of block copolymers bearing beta-dicarbonyl residues
… chelating residues. Polymers were obtained by Group Transfer Polymerisation (GTP)/acetoacetylation and controlled radical polymerisation techniques (RAFT).Different micellar morphologies of poly(n-butyl methacrylate)-block-poly[2-(acetoacetoxy)ethyl methacrylate] (pBuMA-b-pAEMA) were observed …
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Computer simulation of neutron capture therapy.
… and neutron cross sections. A very fast multigroup neutron spectrum calculation is developed by combining collision history correlations with single-collision group transfer probabilities to directly obtain transmission and reflection matrices for multi-slab shielding problems.
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