Sökning: "metal-free"

Visar resultat 1 - 5 av 56 avhandlingar innehållade ordet metal-free.

  1. 1. Metal-Free Catalysis for Efficient Synthesis

    Författare :Juho Bah; Johan Franzén; King Kuok (Mimi) Hii; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Homogeneous c atalysi s; O rga nocatalysis; Green C hemistry; T o tal S ynthesis; A lkaloids; A symmetric S ynthesis; N on - metal Lewis acid s; C arbocations; Sustainability; Kemi; Chemistry;

    Sammanfattning : The strength of efficient metal-free catalysis will be examined in this thesis. Efforts towards more sustainable processes will be demonstrated through implementation of strategies that meet several of the 12 principles of Green Chemistry. LÄS MER

  3. 2. New Reactions with Allyl- and Allenylboron Reagents : Transition-Metal-Catalyzed and Transition-Metal-Free Carbon-Carbon Bond Formation Processes

    Författare :Dong Wang; Kálmán J. Szabó; Jianbo Wang; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; carbon-carbon bond formation; cross-coupling; organoboron compound; allylboron reagent; allylation; transition metal; metal carbene; allenylboron reagent; transition metal free; diazo compound; tosylhydrazone; quinone; organisk kemi; Organic Chemistry;

    Sammanfattning : Organoboron compounds have been widely used in carbon-carbon bond formation reactions in organic synthesis and catalysis. This thesis is focused on cross-coupling reactions of allyl-, allenylboronic acids and their ester derivatives via transition metal catalysis or transition-metal-free processes. LÄS MER

  4. 3. Synthesis of Aryl Ethers : Metal-Free Arylation of Alcohols using Diaryliodonium Salts

    Författare :Erik Lindstedt; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis contains two parts showing different metal-free methods to synthesize aryl ethers using hypervalent iodine reagents, more specifically diaryliodonium salts. The first part describes arylation of benzylic and allylic alcohols and phenols in water using the easily accessible base sodium hydroxide. LÄS MER

  5. 4. Metal-Free O- and C-Arylation with Diaryliodonium Salts

    Författare :Erik Lindstedt; Berit Olofsson; Kilian Muñiz; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hypervalent Iodine; Alkyl Aryl Ethers; Nitro Compounds; Alcohols; Diaryliodonium Salts; organisk kemi; Organic Chemistry;

    Sammanfattning : This thesis concerns the development of metal-free applications using diaryliodonium salts. The first project describes an arylation protocol of allylic and benzylic alcohols in aqueous media. The method proceeds under mild conditions and the ether products were obtained in moderate to good yields. LÄS MER

  7. 5. Hypervalent Iodine Reagents in Metal-Free Arylations and Vinylations : Investigation of Suitable Coupling Partners and Synthesis of New Reagents

    Författare :Elin Stridfeldt; Berit Olofsson; Zoltán Novák; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Diaryliodonium Salts; Benzofurans; Aryl Ethers; Secondary Amides; Vinylbenziodoxolones; organisk kemi; Organic Chemistry;

    Sammanfattning : This thesis concerns the development of metal-free reactions to obtain carbon-heteroatom and carbon-carbon bonds. This is achieved by transferring carbon ligands from hypervalent iodine reagents to suitable nucleophiles. LÄS MER