Sökning: "asymmetric catalysis"

Visar resultat 1 - 5 av 83 avhandlingar innehållade orden asymmetric catalysis.

  1. 1. Asymmetric Catalysis : Ligand Design and Conformational Studies

    Författare :Kristina Hallman; KTH; []
    Nyckelord :asymmetric catalysis; chiral ligand; oxazolines; conformational study; allylic substitution; polymer-bound ligands; dendritic ligands; crown ether; oxidations; palladacycle;

    Sammanfattning : This thesis deals with the design of ligands for efficientasymmetric catalysis and studies of the conformation of theligands in the catalytically active complexes. All ligandsdeveloped contain chiral oxazoline heterocycles. LÄS MER

  2. 2. Novel Pincer Complex-Catalyzed Transformations : Including Asymmetric Catalysis

    Författare :Juhanes Aydin; Kálmán J. Szabó; Oleg V. Ozerov; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; pincer; palladium; catalysis; chiral; asymmetric; palladium IV; allylation; aldol; aminoacid; C-H functionalization; cross-coupling; homoallylic; heck reaction; tridentate ligand; Chemistry; Kemi; Organic Chemistry; organisk kemi;

    Sammanfattning : This thesis is focused on the development of new pincer complex-catalyzed transformations. Optimization of the catalytic properties (fine-tuning) was directed to increase the catalytic activity as well as the chemo-, stereo- and enantioselectivity of the complexes. LÄS MER

  3. 3. Asymmetric catalysis : ligand design and microwave acceleration

    Författare :Ulf Bremberg; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis deals partly with the design and synthesis ofligands for use in asymmetric catalysis, and partly with theapplication of microwave heating on metal-based asymmetriccatalytic reactions.Enantiomerically pure pyridyl alcohols and bipyridylalcohols were synthesized from the chiral pool for future usein asymmetric catalysis. LÄS MER

  4. 4. Asymmetric Hydrogenations : Syntheses of Ligands and Expansion of Substrate Scope

    Författare :Pradeep Cheruku; Pher Andesson; Jay Siegel; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Catalysis; Asymmetric; Hydrogenations; Reductions; Olefins; Imines; Enol phosphinates; Transition metal; Complexes; Iridium; Enamines; Ruthenium; Ligands; Trifluoromethyl; Diphenylvinylphosphine oxides; Vinyl phosphonates; Chemistry; Kemi;

    Sammanfattning : Asymmetric hydrogenation has emerged as a versatile methodology to obtain a wide range of chiral precursors. This thesis focused on the synthesis of new chiral ligands and the expansion of the substrate scope of asymmetric hydrogenations. LÄS MER

  5. 5. Synthesis and Evaluation of N,P-Chelating Ligands in Asymmetric Transition-Metal-Catalyzed Reactions : Ir-Catalyzed Asymmetric Hydrogenation and Pd-Catalyzed Asymmetric Intermolecular Heck Reaction

    Författare :Päivi Tolstoy; Pher G. Andersson; Göran Hilmersson; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Asymmetric hydrogenation; Heck reaction; N; P ligand; Iridium; Palladium; Asymmetric catalysis; Alkenes; Fluorine; Diarylmethine stereocenters; Chemistry; Kemi; organisk kemi; Organic Chemistry;

    Sammanfattning : This thesis describes synthesis of new chiral N,P ligands and their evaluation in two types of asymmetric transition-metal catalyzed reactions. The first part of the thesis describes studies in iridium-catalyzed asymmetric hydrogenation. LÄS MER