Search for dissertations about: "heterocyclic chemistry"

Showing result 11 - 15 of 41 swedish dissertations containing the words heterocyclic chemistry.

  1. 11. Transition metal-catalyzed reduction of carbonyl compounds Fe, Ru and Rh complexes as powerful hydride mediators

    University dissertation from Stockholm : Department of Organic Chemistry, Stockholm University

    Author : Elina Buitrago; Stockholms universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Asymmetric catalysis; amino acid; N-heterocyclic carbene; iron; ruthenium; rhodium; mechanistic investigation; kinetic study; asymmetric transfer hydrogenation; hydrosilylation; Organic Chemistry; organisk kemi;

    Abstract : A detailed mechanistic investigation of the previously reported ruthenium pseudo-dipeptide-catalyzed asymmetric transfer hydrogenation (ATH) of aromatic ketones was performed. It was found that the addition of alkali metals has a large influence on both the reaction rate and the selectivity, and that the rate of the reaction was substantially increased when THF was used as a co-solvent. READ MORE

  2. 12. Design, Synthesis, Mechanistic Rationalization and Application of Asymmetric Transition-Metal Catalysts

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Christian Hedberg; Uppsala universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; asymmetric catalysis; homogeneous hydrogenation; iridium; ruthenium; ligand design; mechanistic studies; kinetics; tolterodine; Organisk kemi; NATURAL SCIENCES Chemistry Organic chemistry; NATURVETENSKAP Kemi Organisk kemi;

    Abstract : This thesis describes mechanistic studies, rational ligand design, and synthesis of asymmetric transition metal catalysts. The topics addressed concerned [Papers I-VII]:[I] The asymmetric addition of diethyl zinc to N-(diphenylphosphinoyl)benzalimine catalyzed by bicyclic 2-azanorbornyl-3-methanols was studied. READ MORE

  3. 13. Excited State Aromaticity and Antiaromaticity Fundamental Studies and Applications

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Rabia Ayub; Uppsala universitet.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Baird s rule; Clar s rule; Computational quantum chemistry; Excited state aromaticity; Excited state aromaticity indicators; Organic photochemistry; Polycyclic conjugated hydrocarbons; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Abstract : The central theme of this thesis is the ability to tune various molecular properties by controlling and utilizing aromaticity and antiaromaticity in the lowest electronically excited states. This investigation is based on qualitative theory, quantum chemical (QC) calculations and experimental work. READ MORE

  4. 14. NHC,P- and N,P-Iridium Catalysts for Hydrogenations and Hydrogen Transfer Reactions

    University dissertation from Stockholm : Department of Organic Chemistry, Stockholm University

    Author : Sutthichat Kerdphon; Stockholms universitet.; [2018]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Iridium catalyst; carbene; N; P-ligand; asymmetric hydrogenation; alkylation; hydrogen transfer reaction; Organic Chemistry; organisk kemi;

    Abstract : The work described in this thesis is focused on hydrogenation and hydrogen transfer reactions using iridium catalysts. The first part concerns the use of N-heterocyclic carbene-phosphine iridium complexes in alkylation reactions (Chapters 2 and 3) and the hydrogenation of ketones (Chapter 4). READ MORE

  5. 15. Development of new Catalytic Methods for the Selective Synthesis of Heterocycles

    University dissertation from Stockholm : Department of Organic Chemistry, Stockholm University

    Author : Stalin Reddy Pathi Pati; Stockholms universitet.; [2018]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; catalysis; indium; heterocycles; Lewis acid; multicomponent reactions; furans; alkynes; Organic Chemistry; organisk kemi;

    Abstract : In the field of organic chemistry, the development of new catalytic methods for the synthesis of complex molecules from simple precursors is a top priority. The main focus of this thesis concerns the diastereoselective synthesis of heterocyclic compounds using main group elements as Lewis acid catalysts. READ MORE