Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Etherification"”.
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CONVENIENT ETHERIFICATION USING TRICHLOROACETIMIDATES AND SYNTHESIS OF AMINOSTEROID SHIP INHIBITORS
<p>Alcohols are a common form of functionality in organic chemistry, and are often present in biologically active molecules. The protection of hydroxy groups is crucial in long multi-step synthetic routes, as the unprotected alcohol is typically not compatible with many reagents. Alcohols are often …
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Thioetherification and Etherification Utilizing Trichloroacetimidates Under Thermal Conditions & Progress Towards an Efficient Synthesis of AQX-1125
… These reactions proceed to the corresponding thioetherification product without the requirement of an added acid, base, or metal catalyst. This facile procedure provides the sulfide in excellent yields with only the formation of the neutral trichloroacetamide as the side product. Formation of the …
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Preparation of Substituted Enol Derivatives from Terminal Alkynes and Progress Toward the Total Synthesis of Nigricanoside A
… includes attempts to join the subunits through etherification reactions as well as descriptions of future strategies to effect etherification.
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Cooperative activation of biomass-derived oxygenates with Lewis acid zeolites
… catalyze the coupled transfer hydrogenation and etherification of 5-(hydroxymethyl)-furfural with primary and secondary alcohols into 2,5-bis(alkoxymethyl) furans, thus making it possible to generate renewable fuel additives without the use of external hydrogen sources or precious metals. …
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Regioselective chlorination of cellulose esters
… challenges of natural cellulose. To date, etherification and esterification are the most effective strategies to modify physicochemical properties of cellulose and append new functionalities. However, they typically require relatively harsh conditions, thus limiting introduction of new …
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The thermodynamics, mechanism and kinetics of the catalytic conversion of propylene and water to diisopropyl ether over amberlyst 15
… reported in terms of a hydration rate and an etherification rate, the latter being the sum of the IPA alkylation and the bimolecular IPA dehydration rates.
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Part I: Development of New Methods for Application in Multicatalytic Reactions Part II: Investigation of Stable Carbenium Catalysts as Hydride Transfer Agents
… trityl catalysts are investigated in a reductive etherification method. A study of trityl catalyst structure and initial investigations into the development of chiral trityl catalysts are presented.
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Estrogens Containing Alkylating Substituents: The Synthesis and Estrogen Receptor Interactions of Estradiol and Hexestrol Affinity Labels
… and extent of receptor inactivation. In general, etherification of hexestrol or substitution of deoxyhexestrol and estradiol produces compounds with relatively modest affinity for the estrogen receptor (0.3-10% that of estradiol). Most of the electrophilic derivatives are effective and rapid …
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Design and Synthesis of Cellulose Ether Derivatives for Oral Drug Delivery
… However, traditional esterification and etherification involve relatively harsh conditions (strongly acidic or strongly alkaline), greatly limiting the content and range of functional groups that may be installed onto the cellulose backbone. Amorphous solid dispersion (ASD) is an …
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Synthesis and characterization of poly(arylene ether)s containing phosphorus, sulfur and heterocyclic pendant moieties
… step polymerizations likely proceed with etherification of one of the phenolic groups, prior to difunctional coupling, which can achieve high molecular weight. The formation of cyclic oligomers in the step-growth polymerization of poly(arylene ether)s was also studied.
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Chemical Modification of Cellulose Esters for Oral Drug Delivery
… on classical methods such as esterification and etherification for appending functional groups. These methods, although they have been very useful, are limited in two respects. First, they typically employ harsh reaction conditions. Secondly, each synthetic pathway is only applicable for one or a …
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Analysis of organosilicone surfactants and their degradation products
… glycols (n = 6 and 9) were prepared by etherification of smaller oligomers. Preparation of the organosilicone compounds M₂D-C₃-O-EO-COCH₃ and M₂D-C₃-OH were also investigated. Atmospheric pressure ionisation mass spectrometry (API/MS) is demonstrated to be a valid and informative method …