Sökning: "Multi-step Reactions"

Visar resultat 1 - 5 av 15 avhandlingar innehållade orden Multi-step Reactions.

  1. 1. Multicomponent Catalytic Reactions : Theoretical and Experimental Studies

    Författare :Martin Pauze; Enrique Gomez Bengoa; Belen Martin-Matute; Vincent Gandon; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; C-H Activation; Quaternary Quinolinium; Organocatalyst; Transition Metal Catalyst; Umpolung Strategy; Multi-step Reactions; Mechanistic Investigation; Density Functional Theory; organisk kemi; Organic Chemistry;

    Sammanfattning : In this thesis, Density Functional Theory (DFT) methods have been applied to study the mechanisms of three different multicomponent organic reactions. Also, a new synthetic procedure for the preparation of quinolinium salts is presented, and its mechanism also studied by DFT calculations. LÄS MER

  3. 2. Amine Transaminases in Multi-Step One-Pot Reactions

    Författare :Mattias Anderson; Per Berglund; Frank Hollmann; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biocatalysis; enzyme; amine transaminase; ω-transaminase; amination; primary amine; chiral amine; chemoenzymatic; green chemistry; synthesis; cascade; Bioteknologi; Biotechnology;

    Sammanfattning : Amine transaminases are enzymes that catalyze the mild and selective formation of primary amines, which are useful building blocks for biologically active compounds and natural products. In order to make the production of these kinds of compounds more efficient from both a practical and an environmental point of view, amine transaminases were incorporated into multi-step one-pot reactions. LÄS MER

  4. 3. New C-C coupling Reactions Enabled by Main-group Organometallics

    Författare :Kilian Colas; Abraham Mendoza; David Procter; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; C-C coupling; organometallics; aluminum; magnesium; Grignard; turbo-Hauser-bases; piperazines; sulfur; ketones; organisk kemi; Organic Chemistry;

    Sammanfattning : The carbon-carbon bond has always been at the very core of chemical research. Strategies for the creation of C−C bonds are one of the keys to the construction game that organic chemists play with the building blocks provided by Nature, with the ultimate goal of producing useful molecular structures that will serve society as medicines, materials, imaging tools, catalysts, and ligands (to mention but a few). LÄS MER

  5. 4. Theoretical Studies on the Molecular Mechanisms of Photo-Catalytic Reactions on TiO2 Surfaces

    Författare :Yongfei Ji; Yi Luo; Annabella Selloni; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TiO2; First-principles; photocatalysis; Kemi; Chemistry;

    Sammanfattning : Photocatalysis is a promising technology that can effectively convert the solar energyinto sustainable green energy. However, theoretical studies on the molecular mechanisms of photocatalytic reactions are rare. LÄS MER

  7. 5. Direct Amino Acid-Catalyzed Enantioselective α-Oxidation Reactions and Asymmetric de novo Synthesis of Carbohydrates

    Författare :Magnus Engqvist; Armando Cordova; Christina Moberg; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organo catalysis; Organic chemistry; Organisk kemi;

    Sammanfattning : The ability of amino acids to form nucleophilic enamines with aldehydes and ketones has been used in the development of asymmetric α-oxidation reactions with electrophilic oxidizing agents. Singlet molecular oxygen has for the first time been asymmetrically incorporated into aldehydes and ketones, and the products were isolated as their corresponding diols in good yields and ee’s. LÄS MER