Search for dissertations about: "organocatalysis"

Showing result 11 - 15 of 26 swedish dissertations containing the word organocatalysis.

  2. 11. Quantum Chemical Studies of Enantioselective Organocatalytic Reactions

    Author : Peter Hammar; Fahmi Himo; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; DFT; enantioselective; asymmetric; organocatalysis; Theoretical chemistry; Teoretisk kemi;

    Abstract : Density Functional Theory is used in order to shed light on the reaction mechanisms and the origins of stereoselectivity in enantioselective organocatalytic reactions. The reactions investigated are the dipeptide-catalyzed aldol reaction, the cinchona thiourea-catalyzed nitroaldol reaction and the prolinol derivative-catalyzed hydrophosphination reaction. READ MORE

  4. 12. Towards Rational Design of Asymmetric Catalyst for Organometallic and Organocatalytic Reactions

    Author : Antti Hartikka; Per Arvidsson; Albrecht Berkessel; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organocatalysis; Transition Metal Complex; Asymmetric; Aldol Reaction; Cyclopropanation; Diels-Alder; Reduction; Conjugate Addition; Organic chemistry; Organisk kemi;

    Abstract : This thesis deals with synthetically modified chiral molecules and their application in asymmetric catalysis. The first part of the thesis describes the use of commercially available chiral diamine ligands in the iridium catalyzed transfer hydrogenation of aromatic ketones. READ MORE

  5. 13. Development of an Asymmetric Synthesis of Glionitrin A and B

    Author : Niels Koning; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; total synthesis; glionitrin; natural products; asymmetric synthesis; organocatalysis; C-H activation; epidithiodiketopiperazine; sulfenylation;

    Abstract : In this thesis, studies in the chemical synthesis of the dithiodiketopiperazine natural products (—)-glionitrin A and B are described.In Chapter 2, a synthesis of the indoline-fused 2,5-diketopiperazine core of glionitrin A and B using a C-H activation approach is described. READ MORE

  6. 14. Computational Studies and Design of Biomolecular Diels-Alder Catalysis

    Author : Mats Linder; Tore Brinck; Kendall N. Houk; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Computational chemistry; density functional theory; enzyme design; molecular modeling; organocatalysis; stepwise Diels-Alder; oxyanion hole;

    Abstract : The Diels-Alder reaction is one of the most powerful synthetic tools in organic chemistry, and asymmetric Diels-Alder catalysis allows for rapid construction of chiral carbon scaffolds. For this reason, considerable effort has been invested in developing efficient and stereoselective organo- and biocatalysts. READ MORE

  7. 15. Bifunctionalization of Small Organic Molecules Based on Fluorine Incorporation

    Author : Marvin Lübcke; Kálmán Szabó; Ryan Gilmour; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fluorination; fluorocyclization; fluorine chemistry; trifluoromethylthiolation; rhodium-catalysis; organocatalysis; asymmetric synthesis; hypervalent iodine; multicomponent reaction; bifunctionalization; diazo compounds; organisk kemi; Organic Chemistry;

    Abstract : The dissertation work that is summarized in this thesis describes novel syntheses of organofluorine compounds with a broad coverage of different fluorine-containing motifs.Chapter 2.1 covers works on the exploration of new trifluoromethylthiolating reactions of diazocarbonyl compounds. READ MORE