Sökning: "Amidation"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet Amidation.

  1. 1. Dynamic Covalent Resolution: Applications in System Screening and Asymmetric Synthesis

    Detta är en avhandling från Stockholm : KTH

    Författare :Pornrapee Vongvilai; KTH.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; dynamic covalent kinetic combinatorial resolution; Self-screening; Transesterification; Amidation; Enzyme catalysis; Nitroaldol reaction; Secondary alcohols; Strecker reaction; Aminonitriles; Racemase; Enzyme catalytic promiscuity; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; NATURAL SCIENCES Chemistry Organic chemistry; NATURVETENSKAP Kemi Organisk kemi; NATURAL SCIENCES Chemistry Organic chemistry Bioorganic chemistry; NATURVETENSKAP Kemi Organisk kemi Bioorganisk kemi;

    Sammanfattning : Combined thermodynamic/kinetic events amount to a kinetically controlled Dynamic Combinatorial Resolution (DCR) process, where the lability of themolecules/aggregates are used to generate dynamics, and the species experiencing the lowest activation energy is selected via kinetic process. Bothinter- and intramolecular processes can be performed using this concept,resulting in complete resolution and associated amplification of the selected species. LÄS MER

  2. 2. Group (IV) Metal-Catalyzed Direct Amidation Synthesis and Mechanistic Considerations

    Detta är en avhandling från Stockholm : Department of Organic Chemistry, Stockholm University

    Författare :Helena Lundberg; Stockholms universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; catalysis; amide; carboxylic acid; amino acid; titanium; zirconium; hafnium; Organic Chemistry; organisk kemi;

    Sammanfattning : The amide unit constitutes the backbone of proteins, and it is present in a large number of pharmaceutically active molecules, polymeric materials such as nylon and Kevlar, as well as in food additives like aspartame. Amides are produced in enormous amounts every year, thus, environmentally friendly and selective methods for their formation are of great importance. LÄS MER

  3. 3. Expression and processing of cecropin and attacin using a baculovirus vector

    Detta är en avhandling från Stockholm : Stockholm University

    Författare :Marianne Hellers; Stockholms universitet.; [1992]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mikrobiologi; Microbiology;

    Sammanfattning : The cecropins and attacins are two antibacterial peptides induced uponimmunization in the moth Hyalophora cecropia. They are both synthesized aspreproproteins that are processed and post-translationally modified along the exportpathway. LÄS MER

  4. 4. Amidst the green Metal-catalyzed amide formation from carboxylic acids

    Detta är en avhandling från Stockholms universitets förlag

    Författare :Helena Lundberg; Stockholms universitet.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis describes novel methods for transition metal-catalyzed transformation of non-activated carboxylic acids to amides. It was found that 2-10 mol% of zirconium(IV) chloride or 10-20 mol% titanium(IV) isopropoxide catalyzed the formation of a range of secondary and tertiary amides in good to excellent yields (61-99%) in THF at 70-100°C, with molecular sieves present as water scavengers. LÄS MER

  5. 5. Chemistry of Carbon Nanostructures Functionalization of Carbon Nanotubes and Synthesis of Organometallic Fullerene Derivatives

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Claes-Henrik Andersson; Uppsala universitet.; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbon nanotubes; Fullerenes; Purification; Functionalization; Organometallic complexes; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Sammanfattning : This thesis is based on two main parts. The first part concerns purification and functionalization of carbon nanotubes (papers I-III), and the second part is related to the synthesis of organometallic fullerene derivatives (papers IV-VII):Two oxidative methods involving aqueous nitric acid were compared with respect to their capability to introduce carboxylic groups into single walled carbon nanotubes, and several literature methods for esterification and amidation of these groups have been evaluated with focus on efficiency and reproducibility in forming covalently functionalized products soluble in organic media. LÄS MER