Sökning: "P-ligands"

Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet P-ligands.

1. 1. Chiral Lithium N,P-amide Complexes. Synthesis, Applications and Structural Studies by NMR and DFT

   Författare :Petra Rönnholm; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 6Li NMR; Asymmetric synthesis; N; P-ligands; DFT; Molecular mechanics;

   Sammanfattning : Enantiospecific synthesis reactions are of intense interest, owing to the increasing request for enantiopure compounds in both research and industry. Lithium amides containing a secondary chelating group are a class of powerful ligands for asymmetric addition reactions. LÄS MER

3. 2. Synthesis and Evaluation of N,P-Chelating Ligands in Asymmetric Transition-Metal-Catalyzed Reactions : Ir-Catalyzed Asymmetric Hydrogenation and Pd-Catalyzed Asymmetric Intermolecular Heck Reaction

   Författare :Päivi Tolstoy; Pher G. Andersson; Göran Hilmersson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Asymmetric hydrogenation; Heck reaction; N; P ligand; Iridium; Palladium; Asymmetric catalysis; Alkenes; Fluorine; Diarylmethine stereocenters; Chemistry; Kemi; organisk kemi; Organic Chemistry;

   Sammanfattning : This thesis describes synthesis of new chiral N,P ligands and their evaluation in two types of asymmetric transition-metal catalyzed reactions. The first part of the thesis describes studies in iridium-catalyzed asymmetric hydrogenation. LÄS MER

4. 3. The Use of N,P-Iridium and N,P-Palladium Complexes in Asymmetric Synthesis

   Författare :Wangchuk Rabten; Pher Andersson; Virginie Vidal; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Iridium; Asymmetric Hydrogenation; Palladium; Asymmetric Cycloisomerization and Hosomi-Sakurai Allylation; organisk kemi; Organic Chemistry;

   Sammanfattning : The work presented in this thesis concerns asymmetric catalysis using chiral N,P-ligands and iridium or palladium transition metals. The first part  (Chapters 2 and 3) highlights the N,P-iridium catalyzed asymmetric hydrogenation of 1,4-cyclohexadienes having functionalized or unfunctionalized substituents, including allylsilane side chains. LÄS MER

5. 4. Developments in the Field of Aza-Diels-Alder Reactions, Catalytic Michael Additions and Automated Synthesis

   Författare :Stefan Modin; Pher Andersson; Lars Engman; Hans Adolfsson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Asymmetric synthesis; aza-Diels-Alder; Michael addition; Transfer hydrogenation; automated synthesis; Catalysis; Organisk kemi; Organic chemistry; Organisk kemi;

   Sammanfattning : The development of new aza-bicyclic structures with potential applications as ligands synthesised via an aza-Diels-Alder cycloaddition has been studied. The studies are concerning the i) development of large scale aza-Diels-Alder reaction, ii) development of a fast and simple route to bicyclic diamine ligands, iii) development of new aza-Diels-Alder adducts from different dienes, iv) development and application of bicyclic N,P ligands for catalytic Michael additions and v) development of robotized asymmetric transfer hydrogenation reactions. LÄS MER

7. 5. Synthesis of Novel Chiral Bicyclic Ligands and their Application in Iridium-Catalyzed Reactions

   Författare :Anna Trifonova; Pher G. Andersson; Guy Lloyd-Jones; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; asymmetric catalysis; Diels-Alder reaction; transfer hydrogenation; hydrogenation; amino-oxazoline; phosphine-oxazoline; imine; olefin; Organisk kemi; Organic chemistry; Organisk kemi;

   Sammanfattning : The synthesis of 2-aza-norborane derivatives is presented. The use of these compounds in preparation of Ir catalysts for asymmetric hydrogenations is described. The evaluation and optimization of the catalysts as well as the mechanistic aspects of the catalytic process are discussed. LÄS MER