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 15 of 15 for “"Nitrogen Transfer"”.
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The Design and Application of Ion-paired Ligands to Address Selectivity Challenges in Transition Metal Catalysed Oxygen and Nitrogen Transfer Reactions
Asymmetric transition metal catalysed reactions are commonly used to access enantioenriched compounds. Classical approaches in this field involve the use of chiral ligands on the metal to induce asymmetry and whilst a well-proven approach to enantiocontrol, it is not universally applicable. Our …
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New axially chiral amine organocatalysts
… amines synthesized were shown to be effective nitrogen transfer reagents in the asymmetric aziridination of chalcone substrates, with enantiomeric excesses of up to 37% seen. The first example of an isolated chiral hydrazinium salt being used as a nitrogen transfer reagent for the aziridination …
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Synthesis and Reactivity of ruthenium(VI) and osmium(VI) Nitrido and Imido Complexes
… and N-tosyliminophenyliodinane produced some nitrogen transfer product, cyclo-(tosyl)NCH 2CHPh.
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Role of mycorrhizal networks in dry Douglas-fir forests
… providing a conduit for interplant resource transfer. Interior Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) is an obligate ectomycorrhizal (EM) tree species that has high potential to form MNs with neighboring trees because of its receptivity to a diverse community of EM …
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C2-Amidoglycosylation With Glycal Donors for the Synthesis of 2-N-Acylamino-2-Deoxypyranosides. Development, Scope, and Mechanism
… anhydride followed by regio- and stereoselective transfer of an amide nucleophile generates an oxazoline intermediate, which can glycosylate a wide variety of nucleophiles in situ to provide the corresponding C2-amidoglycosides. C2-Acetamidoglycosylation with glucals using N-(TMS)acetamide for the …
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Methodology studies on the synthesis of chiral, non-racemic aza-quaternary centres
… chiral aminating reagents in enantioselective nitrogen transfer, while in the second part of the Chapter the emphasis shifts to using an organocatalysis approach involving an ephedrine -hydrazide organocatalyst in conjunction with enantioselective amination methodology using an …
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Forage Systems for the Southeastern United States: Crabgrass and Crabgrass-Lespedeza Mixtures
… with crabgrass may be beneficial due to nitrogen transfer from the legume to the grass. The objectives of the research reported in this thesis were to (1) determine the effects of pH on establishment and growth of crabgrass; and (2) evaluate the effects of lespedeza seeding rate and N …
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Individual And Population Responses Of The Caribbean Sponge, Aplysina Cauliformis, To Natural And Anthropogenic Stressors
… interaction using stable isotopes of carbon and nitrogen shothat algal facilitation was likely due to nitrogen transfer from the sponge. In addition, these experiments shothat algal contact did not have acute effects on internal sponge regulation and partitioning of carbon and nitrogen resources. …
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Enabling the use of unstable, hazardous reagents with continuous flow synthesis
… (NH₂Cl) has not achieved widespread use as a nitrogen transfer reagent due to its unstable and hazardous nature. We developed a continuous flow platform for the safe, reliable, and inexpensive on-demand synthesis of NH₂Cl. Additionally we demonstrate the synthetic utility of NH2Cl by …
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Evaluation of three forage Legumes and Intercropping pattern for improved productivity of maize( Zea mays L.)
… the maize crop could not directly benefit from nitrogen from the three forage legumes. There is therefore, need for further research to look at nitrogen transfer to companion maize over several growing seasons with emphasis also on factors that affect nodulation and capacity of companion forage …
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Evaluation of three forage Legumes and Intercropping pattern for improved productivity of maize( Zea mays L.)
… the maize crop could not directly benefit from nitrogen from the three forage legumes. There is therefore, need for further research to look at nitrogen transfer to companion maize over several growing seasons with emphasis also on factors that affect nodulation and capacity of companion forage …
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Chemical and biological factors affecting the performance of CCA and ACA treated wood in soil
… to the effect of high concentrations of nitrogen on the decay process, fixation and leachability of preservative elements and the role of lignin in the binding of nitrogen and preservative elements to wood.<br/><br/>Concentrations of surface nutrients, including nitrogen, present in CCA …
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Iron catalyzed C-H activation and synthesis of novel ligands
Iron-catalyzed benzylic oxidations, nitrogen transfer reactions such as iminations of sulfides and sulfoxides, aziridinations of olefins and a-aminations of silyl enol ethers were developed. Also, the synthesis of novel nitrogen containing ligands such as 1,4,7-triazacyclononane (TACN) derivatives …
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Catalysis over molybdenum containing nitride materials
Reactions involving nitrogen transfer/ fixation are of great industrial interest, as novel processes could help industries meet their increasingly challenging economic and environmental targets. An example of this could be the direct synthesis of aniline from benzene, which would avoid the lengthy, …
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A physiological basis to crop improvement and agronomic development
… by alteration of partitioning of dry matter and nitrogen in favour of the spike. However, increased partitioning through additional reductions in plant height is not likely; as comparative studies indicate that wheat yield is reduced when plants are shortened beyond a threshold, and most of the …