Search for dissertations about: "borane"

Showing result 1 - 5 of 10 swedish dissertations containing the word borane.

  2. 1. Synthesis and Applications of P-chirogenic Phosphine Boranes

    Author : Magnus Johansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; cytisine; gold I catalysis lipase; P-chirogenic; desymmetrization; phosphine; enantioselective cyclopropanation. enantioselective deprotonation; chirality; asymmetric synthesis; borane;

    Abstract : AbstractThis thesis reports the independent synthesis of both enantiomers of P-chirogenic phosphine ligands and the building blocks thereof, which are suitable for parallel synthesis efforts and for the generation of more diverse libraries of P-chirogenic compound. The use of P-chirogenic phosphine boranes in transition metal-catalyzed reactions, such as palladium-catalyzed allylic alkylation and amination, is also described. READ MORE

  4. 2. Metal Mediated Synthesis. Synthetic and Mechanistic Investigations of Conjugate Addition and Reductive Amination

    Author : Anders Johansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; halosilane; all-trans-geranylgeraniol; copper reagent; primary amines; S -geranylcitronellol; iminium salt; alfa; cuprate; beta-unsaturated; lithium iodide; borane dimethyl sulfide complex; reductive amination; conjugate addition;

    Abstract : The thesis is divided into two separate parts, one treating conjugate addition and the other reductive aminations. The first part of the thesis is concerned with organocopper promoted conjugate addition to .alfa.,. READ MORE

  5. 3. Synthetic studies on naphthoxylosides - labeled compounds and mechanistic studies on acetals

    Author : Richard Johnsson; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fluorescent xylosides; Carbohydrates; Naphthoxylosides; Cancer; Mechanistic studies; Radioactive xylosides; Acetals;

    Abstract : Labeled analogs to an antiproliferative naphthoxyloside have been synthesized and evaluated. Our investigations have shown that the fluorescently labeled analogs are poor structural analogs, and the physical and biological properties are altered to a large extent. READ MORE

  6. 4. Synthesis of some oligosaccharides with D-galacto- and D-gluco-configuration and reductive opening of carbo-hydrate acetals

    Author : Stefan Oscarson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Syntheses of the following oligosaccharides, required for immunological studies. are discussed: £-trifluoroacetamidophenyl O-a-D-glucopyranosyl-(1+4)-a-D-galactopyranoside, ß-trifluoroacetamidophenyl O-a-D-glucopyranosyl-(1 + 6)-a-D-galactopyranoside, 8-methoxy- carbonyloct-1-yl 0-a-D-galactopyranosyl-(1+3)-fi-ß~9"9alact°Pyranosyl- (1+4)-2-acetamido-2-deoxy-ß-D-glucopyranoside, methyl û-a-D-fuco- pyranosyl-(1+4)-ß-D-galactopyranoside, methyl û-a-D-galactopyranosyl- (1+4)-ß-D-fucopyranoside and methyl ß-a-D-fucopyranosyl-(1+4)-ß-D- fucopyranoside. READ MORE

  7. 5. Acetals - Exploring reactivity for improved carbohydrate synthesis

    Author : Markus Ohlin; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : In my research, I have explored various aspects of acetals and their reactivity. Acetals have a central role in carbohydrate chemistry as an inherent functionality and as versatile protecting groups. The first part of the thesis summarizes results on regioselective reductive openings of benzylidene acetals. READ MORE