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Showing 1 to 8 of 8 for “"Nucleophile Addition"”.
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Synthetic studies of heparan derivatives: Glycosyl couplings and post-glycosylative modifications
… can be activated by copper(I) salts for carbon nucleophile addition with terminal L-<em>ido</em> configuration. We also explored stereoselective glycosylation of a novel glucosamine donor with a <em>N</em>-diphenylphosphinamido group.</p>
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Direct synthesis of pyridine and pyrimidine derivatives
… anhydride followed by nitrile addition into the reactive intermediate and cycloisomerization. In situ nitrile generation from primary amides allows for their use as nitrile surrogates. The use of this chemistry with sensitive N-vinyl amides and epimerizable substrates in …
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Stereoselective monoalkyl diazene synthesis for mild reductive transformations : direct synthesis of densely substituted pyridines and pyrimidines
… the presence of 2-chloropyridine followed by n-nucleophile addition to the activated intermediate and annulation. IV. Synthesis of Densely Substituted Pyrimidine Derivatives The direct condensation of cyanic acid derivatives with N-vinyl and N-aryl amides to afford the corresponding …
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Enzymatic polymerisation in situ of depolymerised mimosa tannin applied to stabilisation of collagen
… Acid-catalysed depolymerisation followed by nucleophile addition is a common analytical method for determining the degree of polymerisation of proanthocyanidins. The acid-catalysed depolymerisation method was scaled-up, with the addition of pyrogallol as a nucleophile trapping agent, and …
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Neue Fluoreszenzfarbstoffe mit Anthracen- und Fluoranthengrundgerüst
… von halogensubstituerten Arylen erfolgt durch nucleophile Addition einer Arylgrignardverbindung an 2,6-Di-tert-butylanthrachinon mit anschließender wässriger Aufarbeitung und Reduktion. Eine zweite Gruppe von Anthracenderivaten wird durch Pyrimidin-Kondensation aus Amidinen und …
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Studies of 1,2-quinone monooximes and their metal complexes
… The reaction of 1-nqoH and 5-HqoH gave rise to nucleophile addition products cis- and trans-(0-1,2-dicarbomethoxyethenyl)-1,2-naphthoquinone-1 -oxime, trans-(0-dicarbomethoxyethenyI)-5-hydroxy-1,2-benzoquinone-2-oxime. The yields were enhanced by the presence of small amounts of alkali and …
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Asymmetrische Synthese von 1,3-Aminoalkoholen und deren Anwendung zur Synthese von Azetidinen und 1-Azabicyclen
… were synthesized using a nucleophilic 1,2-addition to the C=N-double bond of the SAMP/RAMP hydrazones with organolithium- or organocer-reagents. Second, an epimerization-free reductive N,N-bond-claverage with BH3-THF-complex was performed. Lastly, N-protection with chloroformic acid benzyl …
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Stereoselektive Propargylierungen mit chromkomplex-substituierten Propargylkationen
… In Anlehnung an die literaturbekannte Addition [71] eines Lithiumacetylids an ein Aldehydderivat werden unter zusätzlicher Chromtricarbonylaren-Komplexierung diastereomerenreine Substratvorläufer 91 erhalten. Mit dem Ziel, die relevanten Einflußfaktoren und Stabilisierungsmechanismen …