Search for dissertations about: "ruthenium catalysis"

Showing result 1 - 5 of 55 swedish dissertations containing the words ruthenium catalysis.

2. 1. Synthesis and asymmetric transformations of diols by enzyme- and ruthenium catalysis

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

   Abstract : 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. READ MORE

4. 2. Mechanistic Studies on Ruthenium-Catalyzed Hydrogen Transfer Reactions

   Author : Jenny B. Åberg; Jan-Erling Bäckvall; Charles P. Casey; Stockholms universitet; []
   Keywords : 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;

   Abstract : 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. READ MORE

5. 3. Ruthenium-catalyzed C-H Functionalization of (Hetero)arenes

   Author : Karthik Devaraj; Lukasz T. Pilarski; Victor A. Snieckus; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; catalysis; C-H activation; heterocycles; ruthenium; aryne precursor; silylation; gramine;

   Abstract : This thesis concerned about the Ru-catalyzed C-H functionalizations on the synthesis of 2-arylindole unit, silylation of heteroarenes and preparation of aryne precursor.In the first project, we developed the Ru-catalyzed C2-H arylation of N-(2-pyrimidyl) indoles and pyrroles with nucleophilic arylboronic acids under oxidative conditions. READ MORE

6. 4. Ruthenium-Catalyzed Asymmetric Transfer Hydrogenation

   Author : Tove Slagbrand; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; allylic alcohols; asymmetric catalysis; isomerization; reduction; ruthenium;

   Abstract : This thesis covers the development of two new methods for the asymmetric reduction of ketones and ketone intermediates. The protocols developed are based on the use of a ruthenium pseudo-dipeptide catalyst that previously has been shown to be efficient and selective in the asymmetric reduction of carbonyl compounds. READ MORE

7. 5. Ruthenium-catalyzed redox reactions and lipase-catalyzed asymmetric transformations of alcohols

   Author : Michaela Edin; Jan-E. Bäckvall; Manfred T. Reetz; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; ruthenium; lipase; catalysis; alcohols; diols; Chemistry; Kemi;

   Abstract : The major part of this thesis describes the synthesis of enantiopure alcohols and diols by combining ruthenium-catalyzed redox reactions that lead to racemization or epimerization and lipase-catalyzed asymmetric trans-formations in one-pot.A mechanistic study of the unexpected facile formation of meso-diacetate products found in enzyme-catalyzed acetylations of alkanediols with Candida antarctica lipase B (CALB) was first performed. READ MORE