Sökning: "Transfer hydrogenation"

Visar resultat 16 - 20 av 46 avhandlingar innehållade orden Transfer hydrogenation.

1. 16. Computational Studies of Transition Metal-Catalyzed Asymmetric Transfer Hydrogenation Reactions

   Författare :Mikael Nordin; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; organisk kemi; Organic Chemistry;

   Sammanfattning : This thesis is based on two studies dealing with the computational investigation of asymmetric transfer hydrogenation reactions, in which hydrogen is transferred from a donor molecule (e.g. alcohol) to a substrate (ketone), via mediation of a metal-ligand catalyst complex. LÄS MER

3. 17. Synthesis and asymmetric transformations of diols by enzyme- and ruthenium catalysis

   Författare :Karin Leijondahl; Jan-Erling Bäckvall; Kurt Faber; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dynamic kinetic asymmetric transformation; diols; enzymatic transformations; catalysis; ruthenium; transfer hydrogenation; Organic chemistry; Organisk kemi; Organic Chemistry; organisk kemi;

   Sammanfattning : The major part of this thesis describes the synthesis of aliphatic secondary diols and the development of lipase- and ruthenium-catalyzed asymmetric transformations of these diols. Several acyclic 1,4-diols and 1,5-diols were synthesized, and by combining a lipase-catalyzed asymmetric transformation with a ruthenium-catalyzed epimerization, enantiomerically- and diastereomerically enriched diacetates were obtained. LÄS MER

4. 18. Asymmetric transfer hydrogenation of aromatic ketones and azirines with NH-ligands

   Författare :Peter Roth; Krister Zetterberg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Organisk kemi; Organic chemistry; Organisk kemi; organisk kemi; Organic Chemistry;

   Sammanfattning : The Ru(arene)[(1S, 3R, 4R)-3-(Hydroxymethyl)-2-azabicyclo[2.2.1]heptane catalyst was optimized as ligand in the asymmetric transfer hydrogenation of ketones and resulted in increased activity and enantioselectivity of the catalyst. LÄS MER

5. 19. Fluid dynamics and mass transfer in bubble columns with and without packing

   Författare :Peter Therning; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; packed bubble column; fluid dynamics; bubble column; laser doppler anemometry LDA ; mass transfer; hydrodynamics; multiphase reactor; dispersion;

   Sammanfattning : Bubble columns are used in the chemical industry to perform gas liquid reactions, like oxidation, hydrogenation and fermentation. The objective of the present thesis was mainly to study the fluid dynamics of semi batch packed bubble columns at both atmospheric and pressurized conditions. LÄS MER

7. 20. N-Heterocyclic Carbene-Phosphine Iridium Catalyzed Alkylation Reactions and Asymmetric Hydrogenation of Ketones

   Författare :Sutthichat Kerdphon; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; C-C coupling reactions; hydrogen transfer; iridium; ketones; methylation;

   Sammanfattning : This thesis is focused on hydrogen transfer reactions using N-heterocyclic carbenephosphine iridium catalysts and is divided in two parts. The first part describes the use of achiral N-heterocyclic carbene-phosphine iridium complexes catalyzing the methylation of ketones and alkylation of amides using alcohols as the electrophile. LÄS MER