Search for dissertations about: "13C labelled"

Showing result 1 - 5 of 17 swedish dissertations containing the words 13C labelled.

  2. 1. Addition of organocuprates to enoates : a mechanistic and synthetic study

    Author : Beritte Christenson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; 13C labelled; TMSX; NMR spectroscopy; diastereoselectivity; solvent effects; pi-complex; enoates; lithium diorganocuprates; conjugate addition;

    Abstract : .... READ MORE

  4. 2. Structural Studies of O-antigen polysaccharides, Synthesis of 13C-labelled Oligosaccharides and Conformational Analysis thereof, using NMR Spectroscopy

    Author : Ulrika Olsson; Göran Widmalm; Corine Sandström; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NMR spectroscopy; conformation; Escherichia coli; lipopolysaccharide; O-antigen; carbohydrates; structure; isotopic labelling; Organic chemistry; Organisk kemi; Organic Chemistry; organisk kemi;

    Abstract : In order to understand biological processes, to treat and diagnose diseases, find appropriate vaccines and to prevent the outbreak of epidemics, it is essential to obtain more knowledge about carbohydrate structures. This thesis deals with structure and conformation of carbohydrates, analysed by NMR spectroscopy and MD simulations. READ MORE

  5. 3. Mechanistic Studies of Organocopper Chemistry by NMR Spectroscopy: Conjugate Additions to Alkynes and Alkenes

    Author : Karolina Nilsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; cyanocuprate; organocopper reagents; ynones; lithium dimethylcuprate; 13C and 15N NMR spectroscopy; pi-complexes; mechanism; enoates; 6Li; 1H-HOESY; ynoates; conjugate addition;

    Abstract : This thesis focuses on the mechanisms of organocopper reactions, in particular the reactions with activated alkynes (ynoates and ynones). These reactions are of interest in the formation of new highly functionalized double bonds with control of the stereochemistry. READ MORE

  6. 4. [11C]Carbon Monoxide and Aryl Triflates in Palladium-Mediated Carbonylation Reactions : Synthetic approaches to [11C]Carbonyl Compounds and [11C]Amines

    Author : Obaidur Rahman; Bengt Långström; Fredrik Almqvist; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; [11C]Carbon monoxide; Aryl triflates; Carbonylation; Organisk kemi; Organic chemistry; Organisk kemi;

    Abstract : The usefulness of low concentrations (typically 10 to 100 µM) of [11C]carbon monoxide and aryl triflates as substrates in 11C-carbonylation using different nucleophiles in the presence of lithium bromide was investigated. The reactions were performed in a micro autoclave of 200 µL volume and catalysed (mediated) by palladium(0). READ MORE

  7. 5. Characterisation of the Microbial Community in Indoor Environments: a Chemical-Analytical Approach

    Author : Aleksandra Sebastian; Avdelningen för medicinsk mikrobiologi; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; indoor air; microbial chemical markers; asthma; allergies; tobacco smoke; Infektioner; Infections;

    Abstract : Inhalation of airborne microorganisms and their toxic components and products may induce a wide spectrum of acute and chronic airway manifestations. The study describes important capabilities of chemical marker analysis in defining human exposure to microorganisms in indoor environments. READ MORE