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Showing 1 to 20 of 150 for “"regioselective"”.
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Regioselective Synthesis of Cellulose Derivatives
… to develop novel synthetic methods to synthesize regioselectively substituted cellulose derivatives including cellulose ethers and esters, and apply advanced characterization tools to understand structure and its influence on properties, which will give us deep insights into the composition of …
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Regioselective Synthesis of Cellulose Esters
… into functionalized cellulose. However, regioselective substitution of cellulose is extremely challenging, especially in the synthesis of regioselectively functionalized cellulose esters due to the unstable ester bond under aqueous alkaline or acid conditions. In this dissertation, the …
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Regioselective chlorination of cellulose esters
… successfully developed a method to chemo- and regioselectively chlorinate cellulose esters using MsCl. Compared to bromination of cellulose typically used, this chlorination method has many advantages, including low cost of reagents and ease of separation. The chlorinated cellulose esters are …
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Regioselective Synthesis of Glycosaminoglycan Analogs
Glycosaminoglycans (GAGs), a large family of complex, unbranched polysaccharides, display a variety of essential physiological functions. The structural complexity of GAGs greatly impedes their availability, thus making it difficult to understand the biological roles of GAGs and structure-property …
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Regioselective synthesis of curdlan derivatives
… reported, but there have been few reports of regioselective functionalization at specific positions of the curdlan backbone, especially of aminated curdlan derivatives which have remarkable potential in biomedical and pharmaceutical applications. We demonstrate herein the design, synthesis and …
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Regioselective Synthesis of Polysaccharide-based Polyelectrolytes
… derivatives from curdlan esters via regioselective ring-opening reactions catalyzed by triphenylphosphine (Ph3P) under mild conditions. Curdlan, a polysaccharide used by the food industry and in biomedical applications, was employed as starting material for preparing these …
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Development of Novel, Regioselective Borylation Protocols
Organoboron compounds are highly valued synthetic intermediates due to their diverse array of reactivity, which is often utilized in the synthesis of valuable organic molecules. For this reason, there is significant interest in the development of novel borylation protocols, especially those whose …
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Regioselective Design of Polysaccharide Ester Graft Copolymers
… must be controlled and properly characterized. Regioselective functionalization of polysaccharides is an appealing route to produce well-defined polysaccharide graft (co)polymers. By selectively derivatizing a single functional group per monosaccharide with a moiety capable of polymer …
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Regioselective modification of amino acid derivatives / Tan Eng Wui
Bibliography: leaves 187-202
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Regioselective Synthesis of Novel Cellulose Derivatives for Drug Delivery
New methods were developed for the regioselective synthesis of new classes of cellulose derivatives with properties that could help improve the delivery of pharmaceutical drugs within the human body. The specific synthetic targets of this research were regioselectively carboxylated and …
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Regioselective, Nucleophilic Activation of C-F Bonds in o-Fluoroanilines
Reactions of fluorinated anilines with stoichiometric Ti(NMe2)4 in mesitylene (typically for 23 h at 120 °C) afforded moderate to high yields of the corresponding N,N-dimethyl-o-phenylenediamine derivatives resulting from defluoroamination of a fluorine atom ortho to the NH2 of the starting …
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The Exploration of a Strategy for Regioselective Arene Amination Utilising Non-Covalent Interactions
… provides a blueprint for further development of regioselective amination reactions and more generally showcases the potential for non-covalent interactions to control regioselectivity in radical chemistry.
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Hydroamination of terminal allylic imines, allylic amines, and internal and terminal homoallylic amines: Regioselective and regiodivergent transformations
… This transformation is highly chemoselective, regioselective, functional group tolerant, and can be used to form trans-diamines with excellent selectivity. Future directions for this method, including anti-Markovnikov and/or asymmetric hydroamination are discussed. The anti-Markovnikov …
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Polyenes by regioselective, living polymerization using molybdenum alkylidene bis(carboxylate) initiators and Ziegler-natta catalysis employing new zirconium diamido complexes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1997.
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Advances in the synthesis of indazoles: regioselective C-7 functionalization by directed ortho metalation and progress towards indazole based azaborine compounds
As one of the fundamental heterocyclic building blocks, indazole and its derivatives have spurred significant research interest and patented applications. In particular, C-7 substituted indazole derivatives are of prime interest due to their significant bioactivities. Azaborine molecules …
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Investigation of the Steric and Electronic Properties of 3-Iminophosphine Ligands in Chelated Palladium Allyl Complexes for Use in the Regioselective Hydroamination of Allenes
… propensity of the complexes in this series to regioselectively catalyze the hydroamination of 3-methyl-1,2-butadiene with aryl amines to form solely the kinetic product at room temperature was studied by observing conversion to products via NMR spectroscopy. An understanding of the importance …
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Study on cyclization reactions of heterocyclic compounds bearing ethynyl and formyl groups in close proximity to each other /
… of the starting materials. Novel, concise and regioselective synthetic methods of 5,7–dihydrofuro[3,4–d]pyrimidine, 5H–pyrano[4,3–d]pyrimidine, 1,3–dihydrofuro[3,4–b]quinolines and 1H–pyrano[4,3–b]quinolines frameworks via regioselective acetalisation/cyclization reactions of 2,4–disubstituted …
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Semi-Synthesis of Melodinine, Taberyunine, and Melosuavine Bis-Indole Alkaloids Through Chemical and Biological Methods
… indole alkaloid (-)-tabersonine through regioselective enzymatic hydroxylation and Polonovski-Potier coupling. Regioselective borylation strategies were used to achieve meta-oxygenated derivatives of (-)-tabersonine for analysis in a Drosophila fruit fly Alzheimer’s phenotype model. A …
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