Sökning: "homogeneous hydrogenation"

Hittade 3 avhandlingar innehållade orden homogeneous hydrogenation.

  1. 1. Iridium Catalysed Asymmetric Hydrogenation of Pyridines

    Författare :Alban Cadu; Pher G. Andersson; Hans Adolfsson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hydrogenation; pyridine; catalytic; Iridium; Organisk kemi; Organic Chemistry;

    Sammanfattning : This thesis presents the hydrogenation of substituted pyridines using N,P-ligated iridium catalystsin homogeneous media. These iridium catalysts were developed within this research group in thepast decade. This method of hydrogenation is highly stereoselective, and in several cases good to excellent ees were obtained. LÄS MER

  3. 2. Homogeneous and Heterogeneous Cluster-Based Catalysts for Asymmetric Reactions

    Författare :Ahmed Fawzy; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Asymmetric synthesis; hydrogenation; ruthenium; osmium; rhenium; phosphine ligands; chirality.;

    Sammanfattning : Synthesis and characterization of new transition metal carbonyl clusters has been undertaken, and evaluation of the new clusters to act as catalysts/catalysts precursor in asymmetric reactions has been carried out. The catalytic hydrogenation of tiglic acid under relatively mild conditions, using diastereomeric clusters of the general formula [(µ-H)2Ru3(µ3-S)(CO)7(µ-1,2-L)] (L= chiral diphosphine of the ferrocene-based Walphos and Josiphos families) as catalysts, reveal different catalytic behavior in terms of conversion and enantioselectivity. LÄS MER

  4. 3. Design, Synthesis, Mechanistic Rationalization and Application of Asymmetric Transition-Metal Catalysts

    Författare :Christian Hedberg; Pher G. Andersson; Hans-Ulrich Blaser; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; asymmetric catalysis; homogeneous hydrogenation; iridium; ruthenium; ligand design; mechanistic studies; kinetics; tolterodine; Organisk kemi; Organic chemistry; Organisk kemi;

    Sammanfattning : 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. LÄS MER