Search for dissertations about: "ditopic"

Found 5 swedish dissertations containing the word ditopic.

  2. 1. Chiral Pyridine-Containing Ligands for Asymmetric Catalysis. Synthesis and Applications

    Author : Fredrik Rahm; KTH; []
    Keywords : asymmetric catalysis; chiral ligand; chiral pool; oxazoline; crown ether; ditopic receptor; bipyridine; pyridyl alcohol; modular approach; P; N-ligand; diethylzinc; allylic alkylation;

    Abstract : This thesis deals with the design and syntheses of chiral,enantiopure pyridinecontaining ligands and their applicationsin asymmetric catalyis.Chiral pyridyl pyrrolidine ligands and pyridyl oxazolineligands were synthesized and employed in thepalladium-catalysed allylic alkylation of 1,3-diphenyl-2-propenyl acetate with dimethyl malonate. READ MORE

  4. 2. Impact of Secondary Interactions in Asymmetric Catalysis

    Author : Anders Frölander; Christina Moberg; Gerard van Koten; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  5. 3. Modulation of Molecular Properties : Host–Guest Interactions for Structural Analysis and Chemical Reactions

    Author : Sara Norrehed; Adolf Gogoll; Jerker Mårtensson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; host-guest systems; conformational analysis; NMR spectroscopy; bispidines; porphyrins; Kemi med inriktning mot organisk kemi; Chemistry with specialization in Organic Chemistry;

    Abstract : This thesis concerns the construction, use and modulation of various host–guest systems, from small bispidines for binding of inorganic ions to bisporphyrin clips for supramolecular systems.Small flexible molecules undergo fast conformational movements when in solution. READ MORE

  6. 4. Host-Guest Interactions for Structural Analysis of Organic Molecules : Development of new Tools for Stereochemical Characterization

    Author : Sandra Olsson; Adolf Gogoll; Kari Rissanen; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; metalloporphyrins; host-guest systems; bis-porphyrin tweezers; stiff stilbene macrocycles; organic synthesis; porphyrin binding studies; NMR; ECCD; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Abstract : The focus of this thesis is on the development of molecular tweezers as host-guest systems for stereochemical characterization of small organic molecules.There are two central problems to stereochemical characterization of small molecules. READ MORE

  7. 5. Bicyclo[3.3.1]nonanes as Scaffolds in Supramolecular Chemistry : From Host-Guest Systems to Hydrogen-Bonded Aggregates

    Author : Anna Lidskog; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; supramolecular chemistry; host-guest system; non-covalent interactions; hydrogen bonding; aromatic interactions; electrostatic interactions; synthetic receptors; self-assembly; nanotubes;

    Abstract : This thesis describes the use of bicyclo[3.3.1]nonane and its heteroanalogue 1,5- diazabicyclo[3.3. READ MORE