Sökning: "organometallic chemistry"

Visar resultat 26 - 30 av 49 avhandlingar innehållade orden organometallic chemistry.

  1. 26. Absolute Asymmetric Synthesis

    Författare :Anders Lennartson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; absolute asymmetric synthesis; enantioselective synthesis; chirality; optical resolution; spontaneous resolution; conglomerate; organozinc reagents; organometallic chemistry; coordination chemistry; supramolecular chemistry; intermolecular interactions; optical resolution;

    Sammanfattning : Absolute asymmetric synthesis is the synthesis of optically active products from achiral or racemic precursors only. This has generally been regarded as impossible and is relevant in the discussion of the origins of biomolecular homochirality. LÄS MER

  3. 27. Metallocene based peptidomimetics and chiral catalysts

    Författare :Suzana Maricic; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Organisk kemi; asymmetric catalysis.; metallocene based amino alcohols; one-pot macrocyclisation; cyclic peptides; Organometallic substance P and Leu 5 -enkephalin; conformational analysis;

    Sammanfattning : Several optically active organometallic Phe-AAn-Phe peptidomimetics and macrocyclic Phe-(Phe)n peptides have been synthesized by either intra- or intermolecular peptide bond formation of the corresponding bis(amino acid) derivatives. The key bis(amino acid) derivatives were available from an improved multi-step synthetic route, utilising Horner-Wadswort-Emmons olefination of organometallic aldehydes with phosphonylglycine reagents, enantioselective hydrogenation of didehydro amino acids and classical solution and/or solid phase peptide synthesis methodology. LÄS MER

  4. 28. Charge-transfer excitations and phtophysical properties of molecular building blocks

    Författare :Oscar Rubio Pons; Yi Luo; Antonio Rizzo; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical chemistry; Photophysical porperties; CCSD; CASSCF; Teoretisk kemi; Theoretical chemistry; Teoretisk kemi;

    Sammanfattning : This thesis reports a state-of-the-art theoretical study of photophysical properties of organic charge-transfer aromatic molecules. These molecules are building blocks of molecular functional materials used in modern photonics technology and play essential roles in chemistry and biology in general. LÄS MER

  5. 29. 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

  7. 30. New C-C coupling Reactions Enabled by Main-group Organometallics

    Författare :Kilian Colas; Abraham Mendoza; David Procter; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; C-C coupling; organometallics; aluminum; magnesium; Grignard; turbo-Hauser-bases; piperazines; sulfur; ketones; organisk kemi; Organic Chemistry;

    Sammanfattning : The carbon-carbon bond has always been at the very core of chemical research. Strategies for the creation of C−C bonds are one of the keys to the construction game that organic chemists play with the building blocks provided by Nature, with the ultimate goal of producing useful molecular structures that will serve society as medicines, materials, imaging tools, catalysts, and ligands (to mention but a few). LÄS MER