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.
Results
Showing 1 to 20 of 26 for “"pentafluorophenyl"”.
-
Phenyl and pentafluorophenyl substiuted 1, 3-dio-xolan 2, 4-diones
A series of phenyl and pentafluorophenyl substituted 1, 3- dioxolan 2,4-diones (a-hydroxy carboxylic acid anhydrocarboxy— lates) has been prepared by the reaction of phosgene with the copper(II) salt of the appropriate a—-hydroxy carboxylic acid and the potential use of such cyclic compounds as …
-
Synthesis, Properties, and Reactivity of Pentafluorophenyl Substituted Cyclopentadienes and Their Transition Metal Complexes
… conditions. This dissertation shows that the pentafluorophenyl (C6F5) substituent is highly electron-withdrawing but avoids all of these problems. Several new C6F5-substituted cyclopentadienes are prepared by the reaction of sodium cyclopentadienide and hexafluorobenzene (C6F6) under varying …
-
Fluorinated boranes in dehydrocoupling and hydroboration
… chemistry of the Lewis adducts of mono- and bis-(pentafluorophenyl)borane (LB·BHn(C6F5)3−n; n = 1, 2; LB = SMe2, NH3) as it applies to the development of novel perfluoroarylboranes. Chapter 2 details the use of Me2S·BHn(C6F5)3−n in the preparation of the pentafluorophenyl substituted amine borane …
-
Developing hydrogen oxidation electrocatalysts using a frustrated Lewis pair approach
… reduction of the archetypal Lewis acid, tris(pentafluorophenyl)borane, was undertaken in low donor strength solvents. This allowed pertinent thermodynamic, kinetic and mechanistic information to be obtained. The redox chemistry of the archetypal FLP system, …
-
Pushing the Limits of the Lithium Indicator Carbon Acidity Scale Using Cyclopentadiene Chemistry and 19F NMR Spectrometry
… The four ring substituents were combinations of pentafluorophenyl, perfluoro-4-tolyl, and perfluoro-4-pyridyl, electronegative groups listed in order of increasing electron-withdrawing power. The most acidic compound in the set was …
-
New precious metal compounds in cancer therapy
… above. With gold(I), either a chloride or pentafluorophenyl counter-anion was used. The rhodium(l) complexes contained 1,5-cyclooctadiene moieties linked to the metal centre via diene complexation, and a chloride counter-anion. Phenylpyridine complexes of gold(lIl) were achieved via …
-
Supramolecular Porphyrin Assemblies: Photosynthetic Reaction Center Analogs and Porphyrin Networks
… by replacing the mesityl substituents with pentafluorophenyl groups.
-
Probing Organometallic Reactions With 19F NMR
… Group 4 metallocene dimethides bearing pentafluorophenyl (C6F5) substituents were synthesized and treated with MAO in benzene-d6. 19F NMR spectroscopic analysis demonstrated reversible methide transfer to form "cation-like" methylmetallocenium methylaluminates. A series of quantitative …
-
Complex bioactive fiber systems by means of electrospinning
… of the pure reactive polymer poly(pentafluorophenyl methacrylate) (PPFPMA) was feasible, the inherent brittleness of PPFPMA required to spin a PCL blend. Blends and pure PPFPMA showed a two-step functionalization kinetics. An initial fast reaction of the pentafluorophenyl esters …
-
Fundamental studies on 2,4,6-trichlorophenyl sulfonate esters
… Sulfonamides can be readily synthesised from pentafluorophenyl (PFP) sulfonate esters and as an expansion to this 2,4,6 trichlorophenyl (TCP) sulfonates have been developed. These have the added advantage of lower toxicity and reduced cost of trichlorophenol. TCP sulfonates can be synthesised …
-
Development and assessment of new sensor systems in food packaging applications
… a phosphorescent reporter dye Pt(II)- tetrakis(pentafluorophenyl) porphyrin (PtTFPP) and a colourimetric pH indicator α-naphtholphthalein (NP) incorporated in a plastic matrix together with a phase transfer agent tetraoctyl- or cetyltrimethylammonium hydroxide (TOA-OH or CTA-OH). The third …
-
Synthesis of functionalised sulfonamides
… however, recent research has established pentafluorophenyl (PFP) sulfonate esters as a useful stable alternative to such species. This thesis describes the use of PFP vinyl sulfonate in a [3+2] cycloaddition with a variety of N-methyl-nitrones, providing access to the corresponding …
-
Borenium Cations as Catalysts for the Reduction of Organic Molecules and Mechanistic Investigations into their Mode of Operation
… borenium ion, synthesized from trityl tetrakis-pentafluorophenyl borate, DABCO, and HBpin did not contain a nucleophilic borohydride counterion and it was isolated in the solid state. This salt was also found to reduce the same substrates with similar yields and reaction times. The mechanisms of …
-
Understanding and Controlling Wettability of Carbon Powders for PEM Fuel Cell Applications
… and VC surfaces were also surface modified with pentafluorophenyl groups, using an in-situ diazonium reduction reaction. The fluorination was confirmed to increase the hydrophobicity of these carbons, but the reaction was also found to introduce nitro groups onto the carbon surfaces. Overall, …
-
New mono and bimetallic chloroquine derivatives : synthesis and evaluation as antiparasitic agents
… the types: triphenylphosphine(L)gold(l) nitrate, pentafluorophenyl(L)gold(l) and chloro(cyclooctadiene)(L)rhodium(l) have been synthesised (where L = chloroquine, ferroquine, N-(7-chloro-quinolin-4-yl)-N'-[2-( N”, N""-dimethylaminomethyl)ferrocenyl methyl]-ethane-1 ,2-diamine, …
-
Cyclopentadiene as a Platform for Polymer Synthesis and Modification of Macromolecular Systems
… were prepared from pentafluorophenylmagnesium bromide and perfluorooctanoyl chloride by nucleophilic acyl substitution and addition reactions. Diels-Alder reactions of 1,2-bis(nonafluorobiphenyl-4-yl)-4-tert-butylcyclopentadiene (CPD-1) with …
-
Síntesis de nanoestruturas metálicas de oro y plata a partir de precursores organometálicos: Propiedades plasmónicas y catalíticas
… organometallic precursor complexes bearing pentafluorophenyl ligands or similar organometallic gold(I) complexes bearing also imidazolium of N-heterocyclic carbene ligands and their decomposition in the presence of different stabilizing ligands. The use of this organometallic approach has …
-
Development of porphyrin tweezer system for determining absolute configuration of chiral molecules via ECCD
… afforded TPFP tweezer which contains three pentafluorophenyl groups at 10,15,20 positions as the best candidate for chirality sensing of chiral molecules. Chapter III-VI constitute the second portion of this dissertation describing the successful application of TPFP tweezer as a chirality …
-
Redox-responsive polymers for the reversible extraction of butanol from water
… by deposition of a reactive polymer, poly(pentafluorophenyl methacrylate (PFM)-co-ethyleneglycol diacrylate (EGDA)). The polymer layer was chemically modified to allow redox polymer grafting.. Impregnation of porous CP with redox polymer gel resulted in electrodes with highest mass of …
-
Sistemas Luminiscentes Ciclometalados de Pt e Ir con Cromóforos 2-Arilbenzotiazol: Aplicaciones Biológicas y Fotocatalíticas
… the synthesis of a series of heteroleptic pentafluorophenyl-bis(2-phenylbenzothiazole) derivatives of Pt(IV) bearing N-donor and trifluoroacetate ligands and of the binuclear complex with bpyb as bridging ligand has been carried out. The variation of the ligand located in the trans position …
Page 1 of 2