Search for dissertations about: "heterocyclic chemistry"

Showing result 36 - 40 of 50 swedish dissertations containing the words heterocyclic chemistry.

  2. 36. Carbenes: The Gathering : Photophysics of Transition Metal Carbene Complexes

    Author : Nidhi Kaul; Leif Hammarström; James K. McCusker; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; photophysics; time-resolved spectroscopy; transition-metal complexes; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

    Abstract : This thesis explores the photophysics of some transition-metal complexes (TMCs) which utilize N-heterocyclic carbenes as ligands. After a historical interlude which traces the development of the broader field of transition metal complexes and their photophysical investigations, there is an overview of theoretical concepts and the spectroscopic methods employed. READ MORE

  4. 37. Synthesis of Nitrogen Heterocycles via 1,3-Dipolar Cycloadditions - Method Development and Applications

    Author : Johan Johansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; 2D NOESY; alkyne; 3-dipolar cycloaddition; azomethine ylide; 1; CNTs; azide; sequential one-pot; SEM EDS; microwave heating; RuAAC; CuAAC;

    Abstract : Because of the diverse properties displayed by nitrogen heterocycles, they are one of the most commonly used structural elements in drug discovery. Due to this variation in properties, however, the chemistry and synthetic pathway to each heterocycle is unique. READ MORE

  5. 38. Synthesis of sulfur and selenium heterocycles, including derivatives of imidazopyridine and benzimidazole

    Author : Malin Björk; Spiros Grivas; Christopher A. Ramsden; Södertörns högskola; Karolinska Institutet; Karolinska Institutet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Aminoimidazoazaarenes; thienomethyleneimidazolinones; imidazo[4; 5b]pyridines; Friedländer; imidazo[4; 5-e]-2; 1; 3-benzoselenadiazoles; 2-aminobenzimidazoles. palladium catalyzed coupling reactions.;

    Abstract : The chemistry developed in this thesis can be divided into two parts. The first part, which is the major part of the thesis, contains syntheses towards analogues to mutagenic heterocyclic amines found in e.g. meat fried at high temperatures. READ MORE

  6. 39. Asymmetric Hydrogenation of Functionalized Olefins Using N,P-Ligated Iridium Complexes

    Author : Taigang Zhou; Pher Andersson; Hans Adolfsson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; asymmetric hydrogenation; iridium; Ramberg-Bäcklund reaction; sulfone; heterocycle; preclamol; remikiren;

    Abstract : Transition-metal-catalyzed asymmetric hydrogenation is one of the most efficient, straightforward, and well-established methods for preparing enantiomerically enriched compounds. Over the past decades, significant progress has been made with iridium, rhodium and ruthenium complexes to asymmetric hydrogenate a selection of olefins, such as, α,β-unsaturated carboxylic acid derivatives, ketones, imines and phosphonates. READ MORE

  7. 40. PEPPSI-type Complexes of Palladium and Platinum: : Investigation of Properties and Applications in Catalysis

    Author : Ekaterina Bolbat; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; PEPPSY-type complexes; palladium; platinum; C−H activation; supported homogeneous catalysts;

    Abstract : Catalysis is a powerful tool to highly efficient production of desired newchemicals by acceleration of a chemical reaction rate. Special compounds used forthis purpose are called catalysts; they induce a change in the chemicalenvironment without being consumed during the process. READ MORE