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Visar resultat 1 - 5 av 15 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Synthesis of Organoboronic Acids and Applications in Asymmetric Organocatalysis

   Författare :Sybrand Jonker; Kálmán Szabó; Jörg Pietruszka; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Boronic acid; BINOL; allylboration; propargylation; homologation; stereoselective synthesis; asymmetric synthesis; organocatalysis; allylboronic acid; allenylboronic acid; organisk kemi; Organic Chemistry;

   Sammanfattning : Allyl- and allenylboronic acids are valuable reagents in organic synthesis due to their configurational stability and high reactivity. Few allyl- and allenylboronates are commercially available. Therefore, both the preparation and synthetic application of these organoboronic acids are subjects of study. LÄS MER

3. 2. Efficient and High-Yielding Routes to Diaryliodonium Salts

   Författare :Marcin Bielawski; Berit Olofsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hypervalent Iodine Compounds; One-Pot Synthesis; Regiospecific Synthesis; Aromatic Substitution; Aryl Iodides; Arenes; Boronic Acids; Organic chemistry; Organisk kemi;

   Sammanfattning : This thesis summarizes three novel and general reaction protocols for the synthesis of diaryliodonium salts. All protocols utilize mCPBA as oxidant and the acids used are either TfOH, to obtain triflate salts, or BF3•Et2O that gives the corresponding tetrafluoroborate salts in situ. LÄS MER

4. 3. Diaryliodonium Salts : Development of Synthetic Methodologies and α-Arylation of Enolates

   Författare :Marcin Bielawski; Berit Olofsson; Antonio Togni; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hypervalent Iodine Compounds; One-Pot Synthesis; Regiospecific Synthesis; Aromatic Substitution; Aryl Iodides; Arenes; Boronic Acids; Heteroaromatics; Arylations; Reaction Mechanisms; Density Functional Calculations; Large Scale Synthesis; Organic synthesis; Organisk syntes; organisk kemi; Organic Chemistry;

   Sammanfattning : This thesis describes novel reaction protocols for the synthesis of diaryliodonium salts and also provides an insight to the mechanism of α-arylation of carbonyl compounds with diaryliodonium salts.  The first chapter gives a general introduction to the field of hypervalent iodine chemistry, mainly focusing on recent developments and applications of diaryliodonium salts. LÄS MER

5. 4. Experimental and Theoretical Studies of Boronic Acids as a Co-Crystal Former

   Författare :Mayura Talwelkarshimpi; Andreas J Larsson; Sten Nilsson Lill; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Physics; Tillämpad fysik;

   Sammanfattning : Multi-component molecular crystal materials have become a surging research subject due to their potential for applications in various fields such as pharmaceutics, energetic materials, electronics, etc. Their properties are governed by the arrangement of the constituent molecules and the various non-covalent interactions between them in their solid-state structure. LÄS MER

7. 5. Hydroarylation of Fullerene C60 Using Arylboronic Acids via Rhodium Catalysis : Improving the Outcomes and Simplifying the Conditions

   Författare :Merve Ergun Dönmez; Helena Grennberg; Luke Odell; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fullerene; C60; hydroarylation; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

   Sammanfattning : Hydroarylation with arylboronic acids is one of the functionalization methods for synthesis of modified fullerenes. In this work, we provide a fast and reproducible one-phase method for hydroarylation of fullerene using boronic acids and an analytical HPLC method that efficiently separates unreacted C60 and product from a hydroarylation reaction mixture as well as a fulleropyrrolidine reaction mixture. LÄS MER