Search for dissertations about: "organometallic reagents"

Showing result 1 - 5 of 12 swedish dissertations containing the words organometallic reagents.

2. 1. Chemistry of Carbon Nanostructures : Functionalization of Carbon Nanotubes and Synthesis of Organometallic Fullerene Derivatives

   Author : Claes-Henrik Andersson; Helena Grennberg; Nazario Martín León; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Carbon nanotubes; Fullerenes; Purification; Functionalization; Organometallic complexes; Kemi med inriktning mot organisk kemi; Chemistry with specialization in Organic Chemistry;

   Abstract : This thesis is based on two main parts. The first part concerns purification and functionalization of carbon nanotubes (papers I-III), and the second part is related to the synthesis of organometallic fullerene derivatives (papers IV-VII): Two oxidative methods involving aqueous nitric acid were compared with respect to their capability to introduce carboxylic groups into single walled carbon nanotubes, and several literature methods for esterification and amidation of these groups have been evaluated with focus on efficiency and reproducibility in forming covalently functionalized products soluble in organic media. READ MORE

4. 2. Absolute Asymmetric Synthesis

   Author : Anders Lennartson; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; absolute asymmetric synthesis; enantioselective synthesis; chirality; optical resolution; spontaneous resolution; conglomerate; organozinc reagents; organometallic chemistry; coordination chemistry; supramolecular chemistry; intermolecular interactions; optical resolution;

   Abstract : Absolute asymmetric synthesis is the synthesis of optically active products from achiral or racemic precursors only. This has generally been regarded as impossible and is relevant in the discussion of the origins of biomolecular homochirality. READ MORE

5. 3. Palladium-Catalyzed Synthesis and Transformations of Organometallic Compounds

   Author : Olov Wallner; Kálmán Szabó; Robin Bedford; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; palladium; Organic chemistry; Organisk kemi;

   Abstract : This thesis is focused on two important fields of palladium catalysis: the development of electrophilic allylic substitution reactions via bis-allylpalladium intermediates; and application of palladium pincer-complexes in the synthesis and transformations of organometallic compounds.Palladium-catalyzed electrophilic allylation of aldehyde and imine substrates could be achieved using readily available allyl chlorides and acetates by employing hexamethylditin or bis(pinacolato)diboron reagents. READ MORE

6. 4. Breaking the symmetry: creation and transfer of optical activity via total spontaneous resolution and stereoselective reactions

   Author : Susanne Olsson; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; absolute asymmetric synthesis; enantioselective reactions; chirality; spontaneous resolution; conglomerate; organometallic chemistry; coordination compounds; attritionenhanced deracemisation; polymorphism; organolithium compounds; single-crystal X-ray crystallography;

   Abstract : The generation of optical activity from achiral or racemic precursors – absolute asymmetric synthesis – is discussed in relation to the origin of biomolecular homochirality but is also often (incorrectly) regarded as being impossible. One approach to absolute asymmetric synthesis is the use of compounds that form chiral crystals. READ MORE

7. 5. Development of Multi-Component Reactions using Catalytically Generated Allyl Metal Reagents

   Author : Nicklas Selander; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organic Chemistry; Organic chemistry; Organisk kemi;

   Abstract : This licentiate thesis is based on the development of catalytic reactions for the synthesis and application of organometallic reagents. By use of palladium pincer-complex catalysts, we have developed an efficient procedure for the synthesis of allylboronates starting from allylic alcohols. READ MORE