Search for dissertations about: "Vicinal"

Showing result 1 - 5 of 33 swedish dissertations containing the word Vicinal.

  2. 1. Enzymes as catalysts in synthesis of enantiomerically pure building blocks : secondary alcohols bearing two vicinal stereocenters

    Author : Rong Liu; Hans-Erik Högberg; Torbjörn Norin; Thorleif Anthonsen; KTH; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; enzyme; kinetic resolution; enantioselectivity; lipase; diastereoselectivity; epimerisation; metal-catalysed transformation; intramolecular alkylation.; Chemistry; Kemi;

    Abstract : Enzymes as tools in organic synthesis have provided enormous advantages. This thesis deals with the applications of enzymes in the kinetic resolutions of racemic compounds. The stereochemistry of chiral compounds and the kinetics of α/β hydrolase lipases are presented. READ MORE

  4. 2. New Methods for the Synthesis of Vicinal Stereocenters : Palladium-Catalyzed Domino Reactions and Asymmetric Transfer Hydrogenation

    Author : Brinton Seashore-Ludlow; Somfai Peter; Kevin Booker-Milburn; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; asymmetric synthesis; domino reactions; palladium-catalyzed reactions; oxindoles; amino alcohols;

    Abstract : In this thesis the synthesis of vicinal stereocenters is investigated in two distinct contexts, namely the construction of 3,3-disubstituted oxindoles and the synthesis of b-hydroxy-a-amino acids. Both scaffolds are prevalent in a range of natural products and biologically relevant compounds and, therefore, methods for their synthesis are of great import. READ MORE

  5. 3. Interaction of some molecules with complex surfaces

    Author : Andrea Resta; Synkrotronljusfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Catalysis; Ethylene; CO.; Surface Science; Vicinal surface; Ethanol; Rh;

    Abstract : This thesis investigates the adsorption, decomposition and reactions of small molecules on flat, oxidised and vicinal surfaces of late transition metals. The main technique for these studies is high resolution core level spectroscopy (HRCLS). All the studies presented in the thesis are performed in Ultra High Vacuum (UHV). READ MORE

  6. 4. The effect of surface steps and oxides on the catalytic activity on model Pd and Rh catalysts

    Author : Chu Zhang; Synkrotronljusfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Surface X-ray diffraction SXRD ; X-ray photonelectron spectroscopy; Catalytic activity; Oxide; Single Crystal surface; surface structure; vicinal surface; CO oxidation; stepped surface; Fysicumarkivet A:2018:Zhang;

    Abstract : A catalyst is a substance that can speed up the rate of a chemical reaction without itself being consumed. Catalysts are crucial for chemical production industries, where about 90% of all chemicals are produced using catalysts. READ MORE

  7. 5. Synchrotron-based In Situ Electron Spectroscopy Applied to Oxide Formation and Catalysis

    Author : Niclas Johansson; Synkrotronljusfysik; []
    Keywords : CO oxidation; Sonogashira cross-coupling; trilayer FeO; vicinal FeO; Mn III -salen; APXPS; XAS; Fysicumarkivet A:2017:Johansson;

    Abstract : In this thesis, in situ ambient pressure X-ray photoelectron spectroscopy has been used to address chemical reactions on surfaces. The presented work aims at the investigation of the relation between pressure and adsorbate surface structures during catalytic reactions. READ MORE