Sökning: "sulfone"

Visar resultat 11 - 15 av 18 avhandlingar innehållade ordet sulfone.

1. 11. Towards alkali-stable polymers and hydroxide exchange membranes functionalized with alicyclic quaternary ammonium cations

   Författare :Thanh Huong Pham; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hydroxide exchange membrane; fuel cell; alicyclic quaternary ammonium; alkali-stable; high hydroxide conductivity; structure-property relationship;

   Sammanfattning : In the current work, cationic polymers functionalized with N-alicyclic quaternary ammonium (QA) cations were synthesized and characterized as potential hydroxide exchange membranes (HEMs) for application in fuel cells. Three different polymers, namely poly(arylene ether sulfone), spiro-ionene and poly(arylene alkylene), were explored as polymer backbones for the HEMs. LÄS MER

3. 12. On a Solvent Extraction System for Recycling Used Nuclear Fuel with CyMe4-BTBP and TBP as Extracting Agents

   Författare :Jenny Halleröd; Chalmers tekniska högskola; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Solvent Extraction; CyMe4-BTBP; FS-13; GANEX; TBP;

   Sammanfattning : In Sweden, as well as in many other countries worldwide, the demand for electricity and electrical energy is high. One solution to satisfy this demand in the long term could be to upgrade the nuclear power plants, including recycling of used nuclear fuel, to Generation IV. LÄS MER

4. 13. Application of metalation reactions for synthesis of sulfur/selenium-containing heterocyclic compounds

   Författare :Hamid Shirani; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Heterocycles; indoles; 3- arylthio indoles; thiopyranobisindoles; dibenzothiepins; 3; 3′-dithiobisindoles; alkaloids; echinosulfone A; cyclization; ortho-metalation; McMurry coupling; sulfides; sulfones and disulfides;

   Sammanfattning : This thesis deals mainly with the synthesis of various sulfur/selenium-containing heterocyclic compounds, many of which include structural features present in several biologically active molecules, with particular emphasis on compounds of synthetic importance, such as indoles, as well as other heteroaromatic species. In the first part, an efficient procedure toward synthesis of new 3-(arylthio)indoles based on reactions of aryl Grignard reagents or lithiated heteroaromatics with protected 3,3′-dithiobisindoles is described. LÄS MER

5. 14. Synthesis of indole and oxindole derivates incorporating pyrrolidino, pyrrolo or imidazolo moieties

   Författare :Stanley Rehn; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Isatin; three-component reaction; a-amino acid; azomethine ylide; pyrrolidino-3-spiro-3?-oxindole derivatives; 3-methyleneoxindole derivatives; pyrroloquinolone; TosMIC; ß-carboline; tosylimine; pyrrole; keto-enol tautomerism; indolopyran-2-one; imidazole; benzylimine; tetrahydroindole;

   Sammanfattning : The focus of this thesis is on the synthesis of oxindole- and indole-derivatives incorporating pyrrolidins, pyrroles or imidazoles moieties. Pyrrolidino-2-spiro-3'-oxindole derivatives have been prepared in high yielding three-component reactions between isatin, alpha-amino acid derivatives, and suitable dipolarophiles. LÄS MER

7. 15. Transition metal dissolution from Li-ion battery cathodes

   Författare :Yonas Tesfamhret; Reza Younesi; Erik J. Berg; Mark Huijben; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lithium-ion battery; Lithium-ion cathode; Transition metal dissolution; Atomic Layer Deposition; Inductively coupled plasma atomic emission spectroscopy; Cathode-electrolyte interaction; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Sammanfattning : Lithium-ion batteries (LIBs) have become reliable electrochemical energy storage systems due to their relative high energy and power density, in comparison to alternative battery chemistries. The energy density of current LIBs is limited by the average operating voltage and capacity of oxide-based cathode materials containing a variety of transition metals (TM). LÄS MER