Sökning: "hydrogen bond"

Visar resultat 16 - 20 av 222 avhandlingar innehållade orden hydrogen bond.

  1. 16. Proton-Coupled Electron Transfer from Hydrogen-Bonded Phenols

    Författare :Tania Irebo; Leif Hammarström; James M. Mayer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Proton-coupled electron transfer; phenol oxidation; hydrogen bonds; artificial photosynthesis; promoting vibrations; proton transfer; laser flash-quench; transient absorption.; Physical chemistry; Fysikalisk kemi; Fysikalisk kemi; Physical Chemistry;

    Sammanfattning : Proton-coupled electron transfer (PCET) is one of the elementary reactions occurring in many chemical and biological systems, such as photosystem II where the oxidation of tyrosine (TyrZ) is coupled to deprotonation of the phenolic proton. This reaction is here modelled by the oxidation of a phenol covalently linked to a Ru(bpy)32+-moitey, which is photo-oxidized by a laser flash-quench method. LÄS MER

  3. 17. Mechanistic Studies on Ruthenium-Catalyzed Hydrogen Transfer Reactions

    Författare :Jenny B. Åberg; Jan-Erling Bäckvall; Charles P. Casey; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mechanistic studies; catalysis; ruthenium; hydrogen transfer; racemization; transfer hydrogenation; alcohols; ketones; amines; imines; inner-sphere; outer-sphere; solvent cage effect; Organic chemistry; Organisk kemi; organisk kemi; Organic Chemistry;

    Sammanfattning : Mechanistic studies on three different ruthenium-based catalysts have been performed. The catalysts have in common that they have been employed in hydrogen transfer reactions involving alcohols and ketones, amines and imines or both. LÄS MER

  4. 18. Studies of the hydrogen bond and the ortho-effect

    Författare :Inga Fischer; Stockholms högskola; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 19. Glycerol derivatives in the hydrogen autotransfer reaction - Development of C-C and C-N bond forming reactions

    Författare :Anna Said Stålsmeden; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; amination; organic synthesis; sustainable precursors; alkylation; hydrogen autotransfer; glycerol;

    Sammanfattning : Glycerol (1,2,3-propanetriol) is obtained as a byproduct in the biodiesel industry. In the quest for more sustainable starting materials for organic synthesis, glycerol with its three alcohol functionalities is a promising candidate. LÄS MER

  7. 20. Impact of Secondary Interactions in Asymmetric Catalysis

    Författare :Anders Frölander; Christina Moberg; Gerard van Koten; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; asymmetric catalysis; secondary interaction; hydrogen bond; chiral ligand; allylic alkylation; hydrosilylation; cyanation; pymox; box; PHOX; pybox; palladium; iridium; rhodium; Lewis acid; Lewis base; Organic chemistry; Organisk kemi;

    Sammanfattning : This thesis deals with secondary interactions in asymmetric catalysis and their impact on the outcome of catalytic reactions. The first part revolves around the metal-catalyzed asymmetric allylic alkylation reaction and how interactions within the catalyst affect the stereochemistry. LÄS MER