Sökning: "C—H activation"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden C—H activation.

1. 1. C–H activation through late transition metal cyclometallation. Addressing selectivity and reactivity problems

   Författare :Mikhail Kondrashov; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; C—H activation; cyclometallation; pincer ligands; anion exchange; bimetallic complexes; oxidative functionalisation;

   Sammanfattning : The ligand-directed C—H activation relies on a coordinating donor atom being in proximity to the C—H bond activated. Cyclometallation of 2-(1-naphthyl)-pyridine – a substrate containing both γ- and δ-positions in proximity to the directing nitrogen atom – was studied. LÄS MER

3. 2. Iridium-Catalyzed C−H Activation Methods for Late-Stage Functionalization of Pharmaceuticals

   Författare :Erik Weis; Belén Martín‐Matute; Jin-Quan Yu; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; amination; catalysis; C-H activation; C-H functionalization; high-throughput experimentation; iodination; iridium; isotope labelling; late-stage functionalization; methylation; Organic Chemistry; organisk kemi;

   Sammanfattning : C-H activations have over the recent decades risen from a mere curiosity to a viable synthetic strategy. However, challenges in terms of accessible transformations, selectivity and functional group tolerance limit the widespread applicability of this approach. LÄS MER

4. 3. Unveiling Catalytic Species in Suspension/Solution-Based Reactions by In Situ X-Ray Absorption Spectroscopy : Evolution of Palladium and Ruthenium Species

   Författare :Ning Yuan; Xiaodong Zou; Ingmar Persson; Gopinathan Sankar; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palladium and ruthenium species; Catalysts; Suspension and solution; In situ X-ray absorption spectroscopy; Activation; Deactivation; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : The palladium (Pd) and ruthenium (Ru) species in several attractive catalysts have been probed using X-ray absorption spectroscopy (XAS). The study of catalyst evolution in suspension- and solution-based reactions was the primary aim. It was achieved by performing in situ XAS experiments on Pd and Ru over the course of the reactions. LÄS MER

5. 4. PEPPSI-type Complexes of Palladium and Platinum: : Investigation of Properties and Applications in Catalysis

   Författare :Ekaterina Bolbat; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PEPPSY-type complexes; palladium; platinum; C−H activation; supported homogeneous catalysts;

   Sammanfattning : Catalysis is a powerful tool to highly efficient production of desired newchemicals by acceleration of a chemical reaction rate. Special compounds used forthis purpose are called catalysts; they induce a change in the chemicalenvironment without being consumed during the process. LÄS MER

7. 5. Palladium Catalysis in Directed C-H Bond Activation and Cycloisomerisation Reactions

   Författare :Michael Oschmann; Jan-Erling Bäckvall; Oscar Verho; Jose Luis Mascareñas; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palladium II ; Catalysis; C-H Functionalisation; Transamidation; XAS; organisk kemi; Organic Chemistry;

   Sammanfattning : The main focus of this thesis concerns the development of Pd(II)-catalysed synthetic methodologies for the preparation of biologically active compounds.In the first part (paper I-III), unactivated C–H bonds of a cyclobutane derivative are selectively functionalised using a directing group starting from the feedstock compound verbenone (paper I). LÄS MER