Sökning: "chemoselectivity"
Visar resultat 1 - 5 av 19 avhandlingar innehållade ordet chemoselectivity.
1. Lipase chemoselectivity - kinetics and applications
Sammanfattning : A chemoselective catalyst is preferred in a chemical reaction where protecting groups otherwise are needed. The two lipases Candida antarctica lipase B and Rhizomucor miehei lipase showed large chemoselectivity ratios, defined as (kcat/KM)OH / (kcat/KM)SH, in a transacylation reaction with ethyl octanoate as acyl donor and hexanol or hexanethiol as acyl acceptor (paper I). LÄS MER
2. Iodonium Salts : Preparation, Chemoselectivity and Metal-Catalyzed Applications
Sammanfattning : This thesis concerns the preparation and use of diaryliodonium salts. In Project I various unsymmetrical diaryliodonium salts were reacted with three different nucleophiles in order to study the chemoselectivity of the reactions of the salts. LÄS MER
3. Unsymmetrical Diaryliodonium Salts : Development and Chemoselectivity studies
Sammanfattning : The first part describes a chemoselectivity study on diaryliodonium salts where oxygen, nitrogen and carbon nucleophiles have been arylated. Twelve different unsymmetric phenyl(aryl)iodonium salts were designed with a systematic variation of the steric and electronic properties of the aryl group. LÄS MER
4. Catalytic Amide Reductions under Hydrosilylation Conditions
Sammanfattning : This thesis covers the development of catalytic methodologies for the mild and chemoselective reductions of amides. The first part of the thesis describes the use of a Fe(II)/NHC catalyst for the deoxygenation of aromatic tertiary amides to corresponding amines. LÄS MER
5. Development and Applications of Hypervalent Iodine Compounds : Powerful Arylation and Oxidation Reagents
Sammanfattning : The first part of this thesis describes the efficient synthesis of several hypervalent iodine(III) compounds. Electron-rich diaryliodonium salts have been synthesized in a one-pot procedure, employing mCPBA as the oxidant. Both symmetric and unsymmetric diaryliodonium tosylates can be isolated in high yields. LÄS MER