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 946 for “"additions"”.
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Hydroxyl radical additions to arenes
Anthropogenic input of organic compounds into aqueous environments and the effects of these contaminants on ecosystems, as well as human health are of great concern. Many contaminants are found in concentrations in excess of the accepted daily intake (ADI) values. The fate of these contaminants as …
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Additions- und Insertionsreaktioneneines Donor-freien Diarylstannylens
Die vorliegende Arbeit befaßt sich mit Additions- und Insertionsreaktionen von Bis(2,4,6-tri- tert-butylphenyl)stannylen, welches durch Umsetzung von Zinn(II)- bis[bis(trimethylsilyl)amid] mit 2,4,6-Tri-tert- butylphenyllithium gebildet wird. Aus den Additionen der in den ortho-Positionen …
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Diastereoselectivity of Organometallic Additions to Nitrones
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Additions, extensions, transformations : new architecture to old
Architectural preservation in America has led to an increase in imitative architecture in many sectors of the profession and, as one architectural historian has pointed out, there is no historical precedent for imitative architecture. Fortunately, buildings can only rarely be preserved in a static …
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Enantioselective Conjugate Additions to a Hindered Cyclohexenone System
… products to carbon nucleophile conjugate additions to enantioselectively generate vicinal quaternary-tertiary stereocenters. Intermolecular conjugate additions were studied extensively but were unfortunately limited in scope. It is hypothesized that steric congestion around the enone from …
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Novel Conjugate Additions and Cyclizations on Multiyne Systems
This thesis consists of seven chapters focusing on extended conjugation addition chemistry and different modes of cyclization to synthesize important and unique heterocycles including natural products and biomolecules. Chapter 1 provides a novel route for the synthesis of 4-pyrones with broader …
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Stereochemistry of crotylboronate additions to α, β-dialkoxyaldehydes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1985.
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Destabilization of lithium borohydride with additions of magnesium hydride
… can be destabilized with magnesium hydride additions for the purpose of reversibly hydrogen. In reactive composites of these hydrides alternative chemical pathways become available for dehydrogenation, which can modify both the thermodynamics and kinetics of the hydrogen sorption reactions. …
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Lewis Base Catalysis: I. Catalytic Enantioselective Aldol Additions of Methyl Trichlorosilyl Ketene Acetal to Ketones. II. Catalytic Enantioselective Alpha-Additions of Isocyanides to Aldehydes
The first catalytic, enantioselective alpha-addition reaction of isocyanides has been demonstrated with a SiCl4·bisbinaphthyldiamine phosphoramide catalyst. Good yields have been obtained with aromatic, heteroaromatic, conjugated non-aromatic and non-branched aliphatic aldehydes. Aromatic, …
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The effects of post inoculant additions on ductile iron fade
1 PDF file (47 pages)
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The effect of Zr and ZrB2 additions to NdFeB alloys
… removing the soft magnetic phase, free α-Fe, via additions of 0.6 at% of Zr or 1.0 at% of ZrB2 have been investigated by EPMA (Electron Probe Microanalysis) and TEM (Transmission Electron Microscopy). 1.0 at% of ZrB2 has been found to be very effective in suppressing the formation of free α-Fe …
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Lewis Base Catalyzed Enantioselective Aldol Additions: Preparative and Mechanistic Studies
Kinetic studies using ReactIR and rapid injection NMR (RINMR) spectroscopy have confirmed the existence of dual mechanistic pathways involving either one or two phosphoramides. Determination of Arrhenius activation parameters revealed that aldol addition occurs through the reversible albeit …
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Oxidative additions of amides to an iridium(I) metal center
Carboxylic amides will add oxidatively via N-H activation to the complex [(COD)Ir(PMe3h]CI (where COD 1,5-cyclooctadiene) in organic solvents at 80°C to form stable iridium hydrides with the hydride arranged cis to nitrogen and trans to chloride. Acetamide will add to form the complex …
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The Influence of Alloying Additions on Diffusion and Strengthening of Magnesium
… Al. A critical examination of rare earth element additions to Mg is reported, and a new phase in thermodynamic equilibrium with Mg-solid solution is identified in the Mg-Gd binary system. It is also demonstrated that Mg atoms move faster than Y atoms. For the first time the mechanical properties …
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Love’s Dialects: Proposed Additions in Emotionally Focused Therapy for Intercultural Couples
<p>Intercultural romantic relationships have become an increasingly prominent feature of contemporary society due to globalization, migration, and cross-cultural exchange (Livingston & Brown, 2017). However, these partnerships are also associated with elevated levels of relational distress and …
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Branched Chain Fatty Acid Additions to Diets Containing Corn Crop Residues
Experiments were initiated to measure animal performance, digestibility and metabolism characteristics associated with feeding corn crop residues supplemented with branched-chain fatty acids, urea, molasses, corn steep liquor, soybean meal and corn gluten meal.
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