Search for dissertations about: "DBU"

Showing result 1 - 5 of 8 swedish dissertations containing the word DBU.

  1. 1. Development of nitrogen-containing materials for capture and catalytic conversion of carbon dioxide to value-added chemicals

    Author : Thai Q. Bui; Jyri-Pekka Mikkola; Knut Irgum; William Siljebo; Riitta Keiski; Umeå universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CCUS; PEHA; DBU; mesoporous melamine-formaldehyde; DMC; cyclic carbonate; flow reactor; Physical Chemistry; fysikalisk kemi; sustainable development; hållbar utveckling;

    Abstract : Anthropogenic carbon dioxide (CO2) emissions have become a critical environmental issue because a large amount of CO2 releasing into the atmosphere, particularly from the massive use of fossil fuels, is the major factor promoting the global warming and climate change. To mitigate the CO2 emissions, Carbon Capture, Utilization and Storage (CCUS) can be one of important solutions. READ MORE

  2. 2. Development of new Fluorination Methods Directed to Fluorine-18 Labelling

    Author : Miguel Ángel Cortés González; Kálmán J. Szabó; Guosheng Liu; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; fluorine; fluorine-18; late-stage; labelling; nucleophilic; electrophilic; fluorination; positron emision tomography; PET; hypervalent iodine; benziodoxole; metal-free; DBU; copper; palladium; rhodium; carbene; Organic Chemistry; organisk kemi;

    Abstract : This thesis deals with the development of new fluorination reactions and their application to fluorine-18 labelling. Fluorine-18 labelled compounds are employed as tracers in Positron Emission Tomography (PET), which is a powerful non-invasive imaging method in medical diagnostics. READ MORE

  3. 3. Investigation of CO2 interactions with cellulose dissolved in the NaOH(aq) system

    Author : Maria Gunnarsson; Chalmers University of Technology; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DBU; ATR-IR spectroscopy; NaOH aq ; dissolution; NMR spectroscopy; CO2; cellulose;

    Abstract : Cellulose derived from wood can be used as raw material for production of textile fibres, making it a renewable alternative to fossil oil. One of the key steps in this process is dissolution of the cellulose. READ MORE

  4. 4. Studies on Transformations of H-Phosphonates into DNA Analogues Containing P-S or P-C Bonds

    Author : Tommy Johansson; Jacek Stawinski; Joachim Wolfgang Engels; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Organisk kemi; Organic chemistry; Organisk kemi;

    Abstract : In this thesis, mechanistic and synthetic studies on transformations of H-phosphonates into DNA analogues containing P-S or P-C bonds are described. Configurational stability of dinucleoside H-phosphonates and the stereochemical course of their sulfurisation in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) were investigated. READ MORE

  5. 5. Towards synthesis of biologically important phosphate analogues : exploring H-phosphonate and C-phosphonate chemistry

    Author : Annika Kers; Robert Letsinger; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Organic Chemistry; organisk kemi;

    Abstract : This thesis is based on studies directed towards the development of methods for the preparation of phosphorus containing natural products, with the focus on C-phosphonate nucleic acid analogues.Mechanistic studies concerning formation of the phosphorus-carbon bond resulted in development of two efficient protocols for the synthesis of C-phosphonates from the corresponding H-phosphonate derivatives. READ MORE