Sökning: "salen"

Visar resultat 1 - 5 av 53 avhandlingar innehållade ordet salen.

  1. 1. Studies of Ultrafast Relaxation and Photodissociation Processes in Solution

    Författare :Peter Salén; Peter van der Meulen; Jan Davidsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ultrafast spectroscopy; liquid phase; Physics; Fysik;

    Sammanfattning : This thesis focuses on femtosecond studies of relaxation and photo-induced dissociation processes in the liquid environment. Measurements are performed using both polarization sensitive and magic angle transient absorption spectroscopy with excitation wavelengths of 387 nm and 258 nm and a white light continuum probe. LÄS MER

  3. 2. New Methods for Chiral Cyanohydrin Synthesis

    Författare :Erica Wingstrand; Christina Moberg; Benjamin List; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; acyl cyanides; asymmetric synthesis; biocatalysis; cyanide; cyanohydrins; dual activation; enzymes; high-throughput screening; Lewis acid; Lewis base; metal catalysis; minor enantiomer recycling; salen; titanium; Chemistry; Kemi;

    Sammanfattning : This thesis deals with method development in asymmetric catalysis and specifically syntheses of enantioenriched O-functionalized cyanohydrins. The first part describes the development of a method for the synthesis of O‑alkoxycarbonylated and O-acylated cyanohydrins. LÄS MER

  4. 3. Manganese(salen) catalyzed epoxidation of alkenes

    Författare :Christian Linde; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis deals the with steric and electronic effects inthe manganese(salen) catalyzed epoxidation of alkenes.Different methods were employed in the mechanisticinvestigations; molecular modelling, radical trapping, Hammettstudies on linear free-energy relationships and densityfunctional methods. LÄS MER

  5. 4. Application of the 2-Pyridone Hydrogen-Bonding Motif in Supramolecular Catalysis and in Phenanthroline Based Ligands

    Författare :Stefan Jonsson; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; X-ray crystallography; Phenanthroline; Supramolecular Catalysis; Jacobsen-Katsuki Epoxidation; Mn salen ; Hydrogen-bonding; Supramolecular Chemistry; 2-Pyridone; Organisk kemi;

    Sammanfattning : This thesis concentrates on the development, synthesis and evaluation of supramolecular systems, assembled from its components by means of hydrogen bonding, using the self-complementary 2-pyridone motif. The thesis is divided in two parts. LÄS MER

  7. 5. Investigation of Kinetically Labile Supramolecu-lar System Addressing Substrate Selectivity in the Catalytic Epoxidations of Olefins

    Författare :Fabrice Odille; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Naturvetenskap; Natural science; enantioselectivity; Salen Mn III ; substrate selectivity; porphyrin; Jacobsen-Katsuki epoxidation; supramolecular catalysis; Hydrogen-bond; 2-pyridone;

    Sammanfattning : This thesis is devoted to the development and investigation of a supramolecular system used to catalyze Jacobsen-Katsuki epoxidations with the aim to attain substrate selectivity without product inhibition. The supramolecular catalyst is composed of two well-defined entities or units: a catalytic and a receptor. LÄS MER