Sökning: "Iridium catalyst"

Visar resultat 11 - 15 av 35 avhandlingar innehållade orden Iridium catalyst.

1. 11. Coordination chemistry of late transition metals with PCP ligands. Synthesis, catalysis and mechanism

   Författare :Daniel Olsson; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organisk kemi; Organometallic chemistry; Metallorganisk kemi; Organic chemistry; Oorganisk kemi; Inorganic chemistry; Suzuki reaction; Stille reaction; catalysis; cyclometalation; C-H activation; PCP complex; POCOP ligand; PCP ligand; iridium; palladium; platinum;

   Sammanfattning : Abstract The work presented in this thesis discusses synthesis of PCP-complexes and utilisations of such organometallic compounds in catalysis. The complexes, obtained by intramolecular Csp3-H activation, are based on the metals palladium, platinum and iridium. LÄS MER

3. 12. Impact of Secondary Interactions in Asymmetric Catalysis

   Författare :Anders Frölander; Christina Moberg; Gerard van Koten; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; asymmetric catalysis; secondary interaction; hydrogen bond; chiral ligand; allylic alkylation; hydrosilylation; cyanation; pymox; box; PHOX; pybox; palladium; iridium; rhodium; Lewis acid; Lewis base; Organic chemistry; Organisk kemi;

   Sammanfattning : This thesis deals with secondary interactions in asymmetric catalysis and their impact on the outcome of catalytic reactions. The first part revolves around the metal-catalyzed asymmetric allylic alkylation reaction and how interactions within the catalyst affect the stereochemistry. LÄS MER

4. 13. Development of Asymmetric Iridium Catalysed Hydrogenation Reactions

   Författare :Suppachai Krajangsri; Pher Andersson; Patrick Guiry; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Asymmetric hydrogenation; Iridium catalyst; Peterson olefination; Dynamic Kinetic Resolution; organisk kemi; Organic Chemistry;

   Sammanfattning : The focus of the work presented in this thesis is the development of iridium-catalysed asymmetric hydrogenation reactions.The first part of this thesis covers the development of dynamic kinetic resolution in asymmetric hydrogenation of chiral, racemic secondary allylic alcohols, which are converted to chiral saturated alcohols with high dr and ee. LÄS MER

5. 14. Metallacyclic Phosphine Complexes and Intramolecular Csp3-H Bond Activation -Synthesis, Characterisation and Catalytic Application

   Författare :Sven Sjövall; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; catalysis; Heck; diphosphite; diphosphine; phosphine; cyclometallation; C-C activation; C-O activation; C-H activation; palladium; rhodium; iridium; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : The work presented in this thesis deals with metallacyclic late transition metal complexes, obtained by intramolecular Csp3-H activation, and the application of such compounds in catalysis. The new hemilabile P,O phosphines N-methyl-N-propionyl-2-(diphenylphosphino)benzylamine (DPPAM), o-(diphenylphosphino)benzoic acid ethyl ester (DPPES), o-(diphenylphosphino)benzoic acid methyl ether (DPPET) and ±-1-(2- diphenylphosphino)phenylethyl propionate (±-DPPMES) and the symmetrical diphosphorus donor ligands cis-1,3-bis[(diphenylphosphino)methyl]-cyclohexane (DPCY), cis-1,3-bis[(di-tertbutylphosphino)methyl]cyclohexane (DTBCY) and cis-1,3-bis[(di-isopropylphosphino)methyl]cyclohexane (DIPCY) have been synthesised, allowing the preparation of a range of new metallacyclic rhodium(III), iridium(III) and palladium(II) complexes. LÄS MER

7. 15. Novel catalysts development for NOx reduction from H2 combustion engines

   Författare :Jieling Shao; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; H2-SCR; SSZ-13 zeolite; in-situ DRIFTS; Iridium; Nitrogen selectivity; Platinum; reduction pretreatment; temperature intervals; BETA zeolite; Palladium;

   Sammanfattning : Hydrogen, as a clean energy carrier, burns without producing any carbon emissions. Hydrogen internal combustion engines (H2-ICE) are considered an alternative for the transition from conventional fossil-fuel vehicles. LÄS MER