Search for dissertations about: "Substitution reactions"

Showing result 1 - 5 of 98 swedish dissertations containing the words Substitution reactions.

2. 1. Bisindoles : synthesis and reactions

   Author : Eva Koch; KTH; []
   Keywords : ;

   Abstract : 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. READ MORE

4. 2. Organic Reactions i Organised Media

   Author : TOMASZ WITULA; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nucleophilic substitution; mesoporous material; microemulsion; silica; lipase; Liquid crystal; alumina; entrapment.; heterogenized; titania; organic synthesis;

   Abstract : A common problem in synthetic organic chemistry is reactant incompatibility between lipophilic organic compounds and inorganic salts. The thesis reports an investigation of some organic reactions, involving incompatible substrate and nucleophile, performed in liquid crystalline phases and also in slurries of mesoporous materials with different symmetry. READ MORE

5. 3. Ligand Substitution and Solvent : Exchange Reactions of Palladium(II) and Platinum(II) Acetonitrile and Dimethyl Sulfoxide Complexes. A High-Pressure Stopped-Flow and NMR Study

   Author : Björn Hellquist; Jönköping University; []
   Keywords : ;

   Abstract : .... READ MORE

6. 4. Quantum Chemical Studies of Aromatic Substitution Reactions

   Author : Magnus Liljenberg; Tore Brinck; Leif Eriksson; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Teoretisk kemi och biologi; Theoretical Chemistry and Biology;

   Abstract : In this thesis, density functional theory (DFT) is used to investigate the mechanisms and reactivities of electrophilic and nucleophilic aromatic substitution reactions (SEAr and SNAr respectively). For SEAr, the σ-complex intermediate is preceded by one (halogenation) or two (nitration) π-complex intermediates. READ MORE

7. 5. Structure-Reactivity Correlations for Reactions of Palladium(II) and Platinum(IV) Complexes

   Author : Tiesheng Shi; Kemiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; thiol; l-methionine; maleic acid; carboxylic acid; thioether; platinum IV ; palladium II ; linear free energy relationship; volumes of activation; structure-reactivity correlation; reduction; substitution; equilibria; kinetics; mechanism; glutathione; Animal physiology; Djurfysiologi;

   Abstract : The kinetics and mechanism for substitution reactions on tetraaquapalladium(II) by an extended series of thioethers, a great number of carboxylic acids, and olefins have been studied by use of UV-VIS, stopped-flow, and high-pressure stopped-flow spectrophotometry and NMR spectroscopy. Second-order rate constants k and activation parameters (activation enthalpies, entropies, and volumes) for formation of monodentate 1:1 complexes have been determined. READ MORE