Sökning: "silyl"

Visar resultat 1 - 5 av 22 avhandlingar innehållade ordet silyl.

1. 1. Platinum(II) and Palladium (II) Complexes with Group 14 and 15 Donor Ligands. Synthesis, Structure and Substitution Mechanisms

   Författare :Ola Wendt; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mechanism; kinetics; substitution; platinum; palladium; aryl; silyl; nitrile; triphenylstibine; NMR; IR; Raman; X-ray crystallography; stopped-flow; synthesis; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : The present thesis deals with Pd(II) and Pt(II) complexes with group 14 and 15 donor ligands. Such complexes have been prepared and investigated mainly with regard to their ground state structures and the mechanism according to which they undergo substitution. LÄS MER

3. 2. Synthesis of Organofluorine Compounds and Allenylboronic Acids - Applications Including Fluorine-18 Labelling

   Författare :Denise N. Meyer; Kálmán J. Szabó; Dominique Cahard; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; boron; allenylboronic acid; BINOL; homopropargyl alcohol; organocatalyst; organoboron; organofluorine; fluorine; fluorine-18; late-stage; labelling; labeling; nucleophilic; electrophilic; fluorination; positron emision tomography; PET; radiotracer; hypervalent iodine; benziodoxole; benzoxazepines; diaryliodonium salt; metal-free; neutrophil elastase; NE; neutrophil elastase inhibitor; trifluoromethylation; trifluoromethylthiolation; difluoro enol silyl ethers; organisk kemi; Organic Chemistry;

   Sammanfattning : This work is focused on two areas: the chemistry of organofluorine and organoboron compounds. In the first chapter, a copper-catalysed synthesis of tri- and tetrasubstituted allenylboronic acids is presented. Extension of the same method leads to allenylboronic esters. LÄS MER

4. 3. Development of New Methodology in Organic Synthesis: Lewis Acid-Mediated Rearrangements of Ammonium Ylides and Addition of 1, 3-bis(silyl) propenes to Aldehydes

   Författare :Pavel Tuzina; Peter Somfai; Ari Koskinen; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; asymmetric; amino acid; ammonium ylide; Lewis acid; microwave irradiation; Organic synthesis; Organisk syntes;

   Sammanfattning : This thesis deals with the development of new methodologies in organicsynthesis. The main focus is on the development of Lewis acid-mediated [1,2]-rearrangements of ammonium ylides and the novel addition of 1,3-bis(silyl)propenes to carbonyl compounds. LÄS MER

5. 4. Stereoselective Nucleophilic Additions to Aldehydes and Development of New Methodology in Organic Synthesis

   Författare :Tessie Borg; Olof Ramström; Siméon Arseniyadis; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis is divided into four separate parts with nucleophilic addition to aldehydes as the common feature in three of them.The first part deals with the investigation of the stereochemical induction and elucidation of the factors that dictate the p-facial selectivities in Mukaiyama aldol addition to a- and a,b-heteroatom substituted aldehydes. LÄS MER

7. 5. Palladium-catalyzed C-H functionalization of alkenes under oxidative conditions

   Författare :Johanna M Larsson; Kálmán Szabó; Eszter Borbas; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Organisk kemi;

   Sammanfattning : The unique properties of high oxidation state palladium have been used to develop new catalytic alkene C-H functionalization reactions. A Heck-type coupling based on the reactivity of palladium catalysts and diaryliodonium salts has been developed with broad synthetic scope and tolerance for functional groups that are ordinarily reactive in Pd0/PdII catalysis, for example, allylic acetates and aryl bromides. LÄS MER