Search for dissertations about: "sugar epoxide"

Found 3 swedish dissertations containing the words sugar epoxide.

  2. 1. Synthesis and Rearrangement of Epoxy Sugars

    Author : Fritiof Pontén; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organisk kemi; Organic chemistry; crown ether; silica; Intramoleculaf Diels-Alder reaction; radical allylation; allyl sulfone; sugar epoxide; allyl sulfide; ring-contraction; C-glycoside; a; IMDAF; b-unsaturated aldehyde;

    Abstract : Ring-Contraction of sugar-derived epoxy alcohols, functionalised in position 1 and 6, by treatment with lithium bromide and N, N, N', N'-tetramethylurea in refluxing toluene gave enantiomerically pure a,b-unsaturated aldehydes of furanosides. O-Glycosidic epoxy alcohols gave only one, easily purified, aldehyde in approximately 30-60% yield depending on the substitution pattern. READ MORE

  4. 2. Structural Studies of a Xyloglucan Endotransglycosylase from Populus tremula x tremuloides and Three Conserved Hypothetical Proteins from Mycobacterium tuberculosis

    Author : Patrik Johansson; Alwyn Jones; Sherry Mowbray; Pedro Alzari; Uppsala universitet; []
    Keywords : Cell and molecular biology; xyloglucan endotransglycosylase; Mycobacterium tuberculosis; epoxide hydrolase; fatty acid metabolism; fatty acid oxidation; crystallography; Cell- och molekylärbiologi;

    Abstract : This thesis describes the structural studies of four different proteins from two organisms. Xyloglucan endotransglycosylases, XETs, are involved in plant cell wall expansion and remodeling by splitting and reconnecting xyloglucan-cellulose crosslinks. The first crystal structure of a XET enzyme has been determined to 1.8 Å. READ MORE

  5. 3. Mechanism Studies of Catalytic RNA, and RNA and DNA Model Compounds

    Author : Ethel Pettersson; Eric Westhof; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organic Chemistry; organisk kemi;

    Abstract : This thesis describes mechanism studies of transesterifications of phosphate esters. The aim of the studies concerns two fields. First, the catalytic mechanism that group I introns use in self-splicing. The focus was on metal ion coordinating groups at the catalytic site. READ MORE