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 20 of 100 for “"Fluorination"”.
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Direct fluorination of oxygen containing compounds.
Massachusetts Institute of Technology. Dept. of Chemistry. Thesis. 1974. M.S.
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Direct fluorination of inorganic and organic compounds.
Massachusetts Institute of Technology. Dept. of Chemistry. Thesis. 1974. Ph.D.
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Scalable multiphase microchemical systems for direct fluorination
… One example of such chemistry is the direct fluorination of organic molecules. This thesis addresses the design, fabrication, and application of a gas-liquid microreactor as a discovery tool for the synthesis of fluorinated compounds by direct fluorination. A microfabrication methodology was …
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Fluorination Effect on the Conformational Properties of Alkanes
A Series of fluorophores of the general formular P(CF2)nP and P(CF2)n-1CF3 has been synthesized. Copper catalyzed coupling of 1-bromopyrene and the corresponding mono and di-iodoperfluoroalkanes were used in most cases. For the n=3 dimer, a novel 1,w-perfluoroalkylation of pyrene via …
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Multispecies reactor design for fluorination reduction of lunar regolith
Citronellal was converted over sulphonated polystyrene resin catalysts of different acid loading. The catalysts had been prepared sulphonating a commercial polystyrene resin with sulfuric acid. Catalyst activities were screened in the liquid phase and in the gas phase in a temperature range of 50 …
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Dry process fluorination of uranium dioxide using ammonium bifluoride
… the practicality of various unit operations for fluorination of uranium dioxide. The objective was to prepare ammonium uranium fluoride double salts from uranium dioxide and ammonium bifluoride, then decompose these salts to uranium tetrafluoride through heating to temperatures near 425 °C in …
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A fluidized bed kinetic model for the fluorination of Zircon
Please read the abstract in the section 00front of this document
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The synthesis of fluorocarbon monomers and polymers by direct fluorination.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemistry.
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(De)fluorination of Organic Substrates Mediated by Nontrigonal Phosphorus Triamide
… 1) (nucleophilic, electrophilic, or radical) fluorination, and 2) selective defluorination of polyfluorinated substrates. Both creating and breaking C−F bonds in selective manners are of great importance, and present challenges of their own. The work herein describes chemical transformations …
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The Pd-catalyzed fluorination of (hetero)aryl bromides and triflates
… in ligand arylation during the catalytic fluorination of aryl triflates. This process must occur prior to C-F reductive elimination. Further experimental studies of this rearrangement revealed that it likely proceeds via a concerted migratory insertion into the bottom ring of the ligand. …
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Direct fluorination : a new method for the synthesis of trifluoromethyl compounds.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemistry.
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The effect of fluorination on the surface chemistry of adsorbate-metal systems
Ultra-high vacuum surface techniques are used to determine the effect of substituents (mainly fluorine) on the surface chemistry of several adsorbate-metal systems. In the first system, the effect of two substituent groups ($-$CH$\sb3$ and $-$F) on the kinetics of the phenyl coupling reaction on …
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The acidic sulfonimidation of aryl–oxazolines and the electrophilic fluorination of aryl–oxazolines
… oxazoline as a directing group for electrophilic fluorination, it was discovered that acidic sulfonimide nucleophiles including dibenzenesulfonimide, o–benzenesulfonimide, dimethanesulfonimide, and N–(methylsulfonyl)–benzenesulfonamide are discovered to open a variety of alkyl, aryl and …
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I. Selective Chlorination and Fluorination of Quinols II. Synthetic Study of Strongylophorine-26
… our strategy in selective chlorination and fluorination of quinols to offer the corresponding aromatic structures. Quinols, or cyclohexadienones, as oxidized derivatives of phenols, have their remarkable chemical reactivities, including additions to enone, enolate alkylations, aldol …
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Large-scale growth, fluorination, clean transfer, and layering of graphene and related nanomaterials
… improves the synthesis, functionalization (i.e., fluorination), and transfer of graphene and hexagonal boron nitride (h-BN). Further, this document explores new avenues in the large-area, heterogeneous layering of graphene, h-BN, and related nanomaterials like nanoscale water and biomolecules. It …
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An investigation into the fluorination capabilities of ammonium acid fluoride under microwave radiation with respect to zircon
… convenient and safer to use than conventional fluorination methods such as HF and F2. In this study zircon was treated with ammonium acid fluoride (NH4F∙1.5HF) by means of microwave assisted digestion. Reaction times ranged from 10 to 330 minutes at temperatures between 100 °C and 240 °C. …
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Photolysis of fluorinated organic molecules: fluorine mass balances and the roles of nucleophiles, rings, and degree of fluorination
… degradation product across all studies. While defluorination into inert fluoride is the ideal degradation result, a range of organofluorine products were formed. Fluoroacetic acids, acetamides, and products retaining the parent compound fluorinated motifs were observed. The results of these …
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