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Visar resultat 6 - 10 av 17 avhandlingar som matchar ovanstående sökkriterier.

  1. 6. Synthetic studies of marine indole alkaloids and related systems

    Författare :Ann-Louise Jonsson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Marine indole alkaloids; antifouling; synthesis; diketopiperazines; HWE-reaction; bis indole alkaloids; imidates; carbazole alkaloids;

    Sammanfattning : This thesis is mainly focussed oil the synthesis of marine indole alkaloids and related systems, many of which display interesting biological activities. In the first part of this thesis we could establish and confirm the stucture of barettin and 8,9dihydrobarettin, isolated from the marine sponge Geodia baretti. LÄS MER

  3. 7. Bisindoles : synthesis and reactions

    Författare :Eva Koch; KTH; []
    Nyckelord :;

    Sammanfattning : In this thesis, synthesis of various bisindoles have beendeveloped.2,3-Bis-(3-indolyl) succinic acid derivatives wereobtained via iodine promoted coupling of the trianion ofindole-3-acetic acid (IAA) or from the dianion of themethylester of IAA. These compounds were converted to2,3-bis(3-indolyl) maleimides (arcyriarubin analogues) by DDQoxidation. LÄS MER

  4. 8. Advanced Organic Hole Transport Materials for Solution-Processed Photovoltaic Devices

    Författare :Xu Bo; Sun Licheng; Karl Leo; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kemi; Chemistry;

    Sammanfattning : Solution-processable photovoltaic devices (PVs), such as perovskite solar cells (PSCs) and solid-state dye-sensitized solar cells (sDSCs) show great potential to replace the conventional silicon-based solar cells for achieving low-cost and large-area solar electrical energy generation in the near future, due to their easy manufacture and high efficiency. Organic hole transport materials (HTMs) play important roles in both PSCs and sDSCs, and thereby can well facilitate the hole separation and transportation, for obtaining high performance solar cells. LÄS MER

  5. 9. Novel Solid Phase Extraction and Mass Spectrometry Approaches to Multicomponent Analyses in Complex Matrices

    Författare :Nahid Amini; Gunnar Thorsén; Tuulia Hyötyläinen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sample preparation; SPE; RAM; GCB µ-trap; GCB disk; High temperature LC; LC MS; ESI; APCI; Matrix effects; LIT-MS; SALDI; Sample screening; Oxidized GCB; Silicon nitride; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

    Sammanfattning : Analysis of compounds present in complex matrices is always a challenge, which can be partly overcome by applying various sample preparation techniques prior to detection. Ideally, the extraction techniques should be as selective as possible, to minimize the concentration of interfering substances. LÄS MER

  7. 10. Strategies and Methods for Synthesizing Scytonemin Analogues

    Författare :Andreas Ekebergh; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Natural product synthesis is an exciting field of organic chemistry, directed toward constructing naturally occurring compounds, which often are both chemically complex and biologically intriguing. Scytonemin is a unique, dimeric natural product found in cyanobacteria. LÄS MER