Search for dissertations about: "piperidine"

Showing result 6 - 10 of 14 swedish dissertations containing the word piperidine.

  1. 6. Synthetic Transformations via Metal- and Enzyme-Catalyzed Dynamic Kinetic Resolution

    University dissertation from Stockholm : Institutionen för organisk kemi

    Author : Krisztián Bogár; Stockholms universitet.; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; ruthenium; racemization; lipase; dynamic kinetic resolution; secondary alcohol; Candida antarctica lipase B; NATURAL SCIENCES Chemistry Organic chemistry; NATURVETENSKAP Kemi Organisk kemi; Organic Chemistry; organisk kemi;

    Abstract : This thesis deals with the preparation of a new half-sandwich type ruthenium(II)- catalyst for racemization of optically active secondary alcohols and the development of a highly efficient method in combination with lipases such as Candida antarctica lipase B and Pseudomonas cepacia lipase for dynamic kinetic resolution of various functionalized alcohols under mild reaction conditions.It was shown that the RuCl(CO)2(η5-C5Ph5) complex can racemize optically active aliphatic and aromatic secondary alcohols at room temperature in rather short times. READ MORE

  2. 7. Development of Lewis acid mediated stereoselective synthesis of nitrogen containing heterocycles

    University dissertation from Stockholm : Kemi

    Author : Åsa Sjöholm Timén; KTH.; [2003]
    Keywords : organic chemistry;

    Abstract : This thesis deals with the development of syntheticmethodologies for the preparation of enantio- anddiastereomerically enriched nitrogen-containingheterocycles.Asymmetric Lewis acid mediated Diels-Alder reactions with2H-azirines as dienophiles have been studied. READ MORE

  3. 8. Improved analytical methods for perfluoroalkyl acids (PFAAs) and their precursors – a focus on human dietary exposure

    University dissertation from Stockholm : Department of Applied Environmental Science (ITM), Stockholm University

    Author : Shahid Ullah; Stockholms universitet.; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Environmental Science; PFASs; PFAAs; PFOA; PFOS; Precursor; FOSA; PAPs; Method development; LC-MS; SPE; Dietary sample; Drinking water; Human exposure; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : Per- and polyfluoroalkyl substances are a large group of global environmental contaminants. They can be divided into two sub-groups, 1) perfluoroalkyl acids (PFAAs) and 2) so called precursors, i.e. compounds that can potentially be transformed to form PFAAs. READ MORE

  4. 9. Quantum Mechanical Calculations of Thermoelectrical Polymers and Organic Molecules

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Amina Mirsakiyeva; KTH.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Quantum molecular dynamics; Car-Parrinello molecular dynamics; PEDOT; poly 3; 4-ethylenedioxythiophene ; Physics; Fysik;

    Abstract : The subject of the present licentiate thesis is density functional theorybased electronic structure calculations of organic thermoelectric materials and novel organic molecules. We used the Car-Parrinello molecular dynamics method in order to investigate the electronic structure of “green energy” and “greenchemistry” compounds. READ MORE

  5. 10. Studies towards ß-turn mimetics, synthesis of kedarosamine from threonine, and synthesis of glycopeptides from mucins and gp120

    University dissertation from Organic Chemistry, Lund University

    Author : Tatjana Vuljanic; Lunds universitet.; Lund University.; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tn antigen; glycopeptides; glycosylation; diastereselective reduction; kedarosamine; kedarcidin chromophore; amino acids; peptide T; ß-turn mimetic; Organisk kemi; gp120; Organic chemistry;

    Abstract : The secondary structure of proteins is crucial for proper function of the protein in biological systems. Peptide T, an octapeptide from the envelope glycoprotein gp120 of the HIV virus, has previously been shown to be responsible for binding to the CD4 receptor on T helper/inducer lymphocytes. READ MORE