Sökning: "crown ether"

Visar resultat 11 - 15 av 15 avhandlingar innehållade orden crown ether.

  1. 11. Lipases as Biocatalysts in Organic Media. Influence of Enzyme Preparation and Reaction Conditions on Activity and Selectivity

    Författare :Mattias Persson; Avdelningen för klinisk kemi och farmakologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biochemical technology; Bioteknik; Biotechnology; water activity; temperature; enantioselectivity; immobilisation; organic solvents; lyophilisation; Lipases; Accurel EP-100; Biokemisk teknik; Proteins; enzymology; Proteiner; enzymologi;

    Sammanfattning : The discovery that enzymes can function in organic solvents has broadened the scope of biocatalysis, making enzymes highly useful tools for organic chemists. The widespread use of enzymes as catalysts in organic solvents has, however, been limited by the low activity obtained for enzymes in organic solvents compared to aqueous solutions. LÄS MER

  3. 12. General Protocols for the Preparation of Tröger's Base Analogues and Molecular Recognition by Designed Tröger's Base Receptors

    Författare :Jacob Jensen; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Organisk kemi; non-covalent bonds.; molecular recognition; desymmetrization; metal-mediated reactions; Tröger s base; synthetic protocols;

    Sammanfattning : 2,8-Dihalo substituted analogues of Tröger’s base were prepared via the Tröger’s base condensation reaction. These compounds were used as synthetic intermediates for the preparation of otherwise inaccessible functionalized Tröger’s base analogues. LÄS MER

  4. 13. TRÖGER´S BASE AS SCAFFOLD FOR SYNTHETIC RECEPTORS

    Författare :Carlos Solano; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; Organisk kemi; Organic chemistry; Makromolekylär kemi; Macromolecular chemistry; Molecular Recognition; Tröger´s base; Synthetic Receptors; Fysikalisk kemi;

    Sammanfattning : This work focuses on the use of the Tröger´s base as organic scaffold for the construction of synthetic receptors for different classes of organic molecules. The structural properties of the Tröger's base, i.e. chirality, rigidity and curvature, allow for synthetic modifications towards the recognition of different molecules. LÄS MER

  5. 14. Synthesis and study of new oxazoline-based ligands

    Författare :Mélanie Tilliet; Christina Moberg; Vincent Levacher; Jan H. van Maarseveen; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; organic chemistry; Organic chemistry; Organisk kemi;

    Sammanfattning : This thesis deals with the study of oxazoline-based ligands in metal-catalyzed asymmetric reactions. The first part describes the synthesis of six new bifunctinal pyridine-bis(oxazoline) ligands and their applications in asymmetric metal-catalysis. LÄS MER

  7. 15. Making Analogues of Tröger's Base – Fused oligomers, endo/exo isomers and twisted amides

    Författare :Josep Artacho Ruiz; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The centenarian Tröger’s base (TB) was envisaged as scaffold for the construction of tubular-shaped cleft molecules due to its the remarkable structural properties. This endeavor started with the synthesis of the three possible diastereomers of a linear symmetrically fused tris-TB analogue, the anti-anti, the syn-syn, and the syn-anti. LÄS MER