Search for dissertations about: "Organic reaction media"

Showing result 1 - 5 of 29 swedish dissertations containing the words Organic reaction media.

2. 1. Organic Reactions i Organised Media

   Author : TOMASZ WITULA; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nucleophilic substitution; mesoporous material; microemulsion; silica; lipase; Liquid crystal; alumina; entrapment.; heterogenized; titania; organic synthesis;

   Abstract : A common problem in synthetic organic chemistry is reactant incompatibility between lipophilic organic compounds and inorganic salts. The thesis reports an investigation of some organic reactions, involving incompatible substrate and nucleophile, performed in liquid crystalline phases and also in slurries of mesoporous materials with different symmetry. READ MORE

4. 2. Organic Synthesis in Nonionic Microemulsions

   Author : Maria Häger; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; organic reaction; phase behaviour; microemulsion; reaction kinetics;

   Abstract : The aim of this work has been to explore the use of microemulsions as reaction media for organic synthesis. Another important aim has been to improve the understanding of the reaction kinetics and the mechanism of the reaction in this type of surfactant system. READ MORE

5. 3. Asymmetric transfer hydrogenation of ketones : Catalyst development and mechanistic investigation

   Author : Katrin Ahlford; Hans Adolfsson; Martin Wills; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Asymmetric catalysis; reduction; amino acid; rhodium; mechanistic investigation; kinetic study; Organic chemistry; Organisk kemi; organisk kemi; Organic Chemistry;

   Abstract : The development of ligands derived from natural amino acids for asymmetric transfer hydrogenation (ATH) of prochiral ketones is described herein. In the first part, reductions performed in alcoholic media are examined, where it is found that amino acid-derived hydroxamic acids and thioamides, respectively, are simple and versatile ligands that in combination with [RhCp*Cl2]2 efficiently catalyze this particular transformation. READ MORE

6. 4. Methods for the Synthesis of PET Tracers and NMR Studies of Ribonuclease A

   Author : Linda Samuelsson; Bengt Långström; Sharon Stone-Elander; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; [11C]methyl iodide; Stille reaction; palladium; Ribonuclease A; osmolytes; PFG-NMR; Organisk kemi; Organic chemistry; Organisk kemi;

   Abstract : This thesis contains two parts.In the first part, general and versatile palladium-mediated 11C-C bond forming reactions for use in the production of radiotracers for Positron Emission Tomography (PET) were explored. READ MORE

7. 5. The influence of temperature on enzyme selectivity in organic media

   Author : Åsa Jönsson; Bioteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; water activity; sub-zero temperatures; enantioselectivity; peptide yields; asymmetric reductions of ketones; peptide synthesis; ADH from Thermoanaerobium brockii; subtilisin; Enzyme catalysis; a-chymotrypsin; organic solvent; aqueous media; Biotechnology; Bioteknik;

   Abstract : The influence of different reaction parameters on enzyme selectivity was investigated. The reaction conditions studied were solvent dependence, water activity and reaction temperature. READ MORE