Sökning: "halogenation"

Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet halogenation.

1. 1. Transition metal-catalysed isomerisation of allylic alcohols : Applications to C−C, C−F and C−Cl bond formation

   Författare :Nanna Ahlsten; Belén Martín-Matute; M. J. Jonathan Williams; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; transiton metal-catalysis; allylic alcohols; isomerisation; halogenation; organisk kemi; Organic Chemistry;

   Sammanfattning : The focus of this thesis has been to develop selective and atom-economical methods for carbon-carbon and carbon-heteroatom bond formation, and to some extent improve on existing findings in this area. More specifically, methods for the catalytic generation of enolates from allylic alcohols and their in situ functionalisation with electrophilic reagents are described. LÄS MER

3. 2. Transformations of Nitrosoarenes and Alkynyl Enones : Selective Synthesis of Nitrogen-Containing Compounds

   Författare :Angela van der Werf; Nicklas Selander; Gary A. Molander; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; alkynyl enones; catalysis; copper; halogenation; heterocycles; nitrosoarenes; perfluoroalkylation; trifluoromethylation; organisk kemi; Organic Chemistry;

   Sammanfattning : The nitrogen atom plays a unique role in organic chemistry. It is abundantly found in organic materials and is responsible for the activity of many biologically relevant compounds. LÄS MER

4. 3. Development of New Efficient Iridium-Catalyzed Methods for the Construction of Carbon-Heteroatom Bonds

   Författare :Elis Erbing; Belén Martín-Matute; Keary Engle; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Iridium Catalysis; Method development; Halogenation; Isomerization; C-H Activation; organisk kemi; Organic Chemistry;

   Sammanfattning : Today’s society has a large demand for biologically active chemicals that can be used for example as pharmaceuticals and in the agriculture. These are normally constructed by assembling together several smaller chemical molecules. LÄS MER

5. 4. C-H Activation Reactions Mediated by Pd Based Heterogeneous Catalysts : Regioselective Formation of C-O and C-X Bonds

   Författare :Maitham Majeed; Centrum för analys och syntes; []
   Nyckelord :C-H Activation; N-heterocyclic carbenes; palladium; polymer supported Pd II ; undirected acetoxylation; directed halogenation; continuous flow; reduced graphene oxide supported Pd II ;

   Sammanfattning : New classes of N-heterocyclic carbene-palladium(II) complexes containing either a vinyl group in different positions or an anthracene tag in the backbone of the N-heterocycle were synthesized and fully characterized. The vinyl based complexes were copolymerized with divinylbenzene to fabricate robust polymer-supported NHC-Pd(II) systems, while the anthracene based complexes were π-stacked onto the surface of reduced graphene oxide (rGO) producing immobilized catalysts with interesting features. LÄS MER

7. 5. Stereo and regio controlled halogenation, and synthesis of low molecular weight carbohydrates

   Författare :Rolf Johansson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The regio- and stereoselective introduction of halogens as well as unsaturation into carbohydrates is investigated with triphenylphosphine - halide systems. Three different glycosidation methods are presented. LÄS MER