Relevant bibliographies by topics / Trifluoroethanol

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Academic literature on the topic 'Trifluoroethanol'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 March 2023

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Journal articles on the topic "Trifluoroethanol"

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Boston, H. G., V. Sreenivasulu Reddy, P. E. Cassidy, J. W. Fitch, Diane Stoakley, and Anne St Clair. "New Aromatic Diacids Containing the Trifluoromethyl Group and their Polyamides." High Performance Polymers 9, no. 3 (September 1997): 323–32. http://dx.doi.org/10.1088/0954-0083/9/3/010.

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A series of new fluorinated, high-temperature polymers has been prepared from 1, 1, - bis( p-carboxyphenyl)-2, 2, 2-trifluoroethanol (3FOH). This diacid was synthesized by oxidation of 1, 1-di( p-tolyl)-2, 2, 2-trifluoroethanol, which was obtained from p-bromotoluene and ethyl trifluoroacetate. The 3FOH was also reacted with dimethyl sulphate to yield 1-methoxy-1, 1- bis( p-carboxyphenyl)-2, 2, 2-trifluoroethane (3FM), and with SOCl2 to produce 1-chloro-1, 1- bis( p-chloroformylphenyl)-2, 2, 2-trifluoroethane (3FCl). These two diacids, as the acid chlorides, were polymerized with six aromatic and four aliphatic diamines to produce polyamides which had viscosities ranging from 0.32 to 1.52 dl g−1, thermal stabilities up to 518 °C in nitrogen and glass transition temperatures from 165 °C to 337 °C. The dielectric constants of these polyamides ranged from 2.64 to 2.99. The 3FM- and 3FCl-containing polyamides were compared with the 6F (hexafluoroisopropylidene) analogues and found to be somewhat less thermally stable and had equal or lower Tgs.
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Schwertfeger, Hartmut. "2,2,2-Trifluoroethanol." Synlett 2010, no. 19 (October 22, 2010): 2971–72. http://dx.doi.org/10.1055/s-0030-1258840.

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JALILI, S., and M. AKHAVAN. "A MOLECULAR DYNAMICS SIMULATION STUDY OF CONFORMATIONAL CHANGES AND SOLVATION OF Aβ PEPTIDE IN TRIFLUOROETHANOL AND WATER." Journal of Theoretical and Computational Chemistry 08, no. 02 (April 2009): 215–31. http://dx.doi.org/10.1142/s0219633609004769.

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Molecular dynamics (MD) simulations of amyloid beta peptide have been performed in aqueous solutions of trifluoroethanol with different concentrations. The amount of α-helical secondary structure increases when going from pure water to trifluoroethanol-rich solutions. The conformation obtained in 40% (v/v) trifluoroethanol solution is very similar to the experimental observations of beta peptide in sodium dodecyl sulfate micelle. In this solution, the peptide has two helical segments connected through a looped region. The C-terminal helix of beta peptide unfolds in pure water. The effect of trifluoroethanol on peptide's secondary structure has been explained using the properties calculated from MD trajectories.
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Norcross, Bruce E., William C. Lewis, Huifa Gai, Nazih A. Noureldin, and Donald G. Lee. "The oxidation of secondary alcohols by potassium tetraoxoferrate(VI)." Canadian Journal of Chemistry 75, no. 2 (February 1, 1997): 129–39. http://dx.doi.org/10.1139/v97-017.

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The kinetics of the oxidation of 2-propanol, 1,1,1-trifluoro-2-propanol, 1,1,1,3,3,3-hexafluoro-2-propanol, 1-phenyl-2,2,2-trifluoroethanol, 1-(4-methylphenyl)-2,2,2-trifluoroethanol, 1-(3-bromophenyl)-2,2,2-trifluoroethanol, and 1-(3-nitrophenyl)-2,2,2-trifluoroethanol by potassium tetraoxoferrate(VI) have been studied under basic conditions. The products are ketones, formed in almost quantitative yields, iron(III) hydroxide, and dioxygen. The reactions are characterized by substantial enthalpies of activation (40–60 kJ/mol), very unfavorable entropies of activation, large primary deuterium isotope effects, and a positive Hammett ρ value. Both acid and base catalysis are observed. Acid catalysis is attributed to formation of a more reactive oxidant, HFeO4−, at low pH. Base catalysis is attributed partly to the conversion of the reductants to alkoxide ions at high pH, and partly to the reaction of hydroxide ion with tetraoxoferrate(VI) to give a five-coordinated species, HOFeO43−, that reacts rapidly with nucleophiles. A reaction mechanism involving formation of an intermediate ferrate ester is proposed. Keywords: oxidation, alcohols, potassium tetraoxoferrate(VI), ferrate esters, base catalysis, acid catalysis.
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Ferber, PH, GE Gream, and TI Stoneman. "The 9-Decalyl and Related cations VII. Solvolysis of 3-(Cyclohex-1′-enyloxy)propyl p-Nitrobenzenesulfonate." Australian Journal of Chemistry 38, no. 5 (1985): 699. http://dx.doi.org/10.1071/ch9850699.

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The solvolysis of 3-(cyclohex-1′-enyloxy) propyl p- nitrobenzenesulfonate (5) in ethanol buffered separately with sodium ethoxide and triethylamine and 2,2,2-trifluoroethanol buffered with triethylamine has been investigated. Kinetic determinations and product studies have been carried out. In ethanol buffered with sodium ethoxide , π-bond participation in the above ester occurs to the extent of 30%; this is raised to 84% when triethylamine is used as the buffering agent. With buffered trifluoroethanol as solvent, π-bond participation in the ester is complete; kunsat/ksat = 920 and a quantitative yield of cyclized products is obtained. Kinetic evidence indicates a lack of significant involvement of a lone pair on oxygen (enol ether system) in the solvolysis of the sulfonate ester; in trifluoroethanol , the compound solvolyses only 1.15 times more rapidly than does 4-(cyclohex-1′-enyl)butyl p-nitrobenzenesulfonate (2), its carbon analogue.
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Netto-Ferreira, J. C., V. Wintgens, and J. C. Scaiano. "Laser flash photolysis study of the photoenols generated from ortho-benzylbenzophenone in different solvents." Canadian Journal of Chemistry 72, no. 6 (June 1, 1994): 1565–69. http://dx.doi.org/10.1139/v94-195.

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Irradiation of ortho-benzylbenzophenone leads to the formation of two (E,E and Z,E) out of the possible four photoenols. Laser flash photolysis studies show that the process involves the intermediacy of a short-lived biradical (τ∼50 ns in methanol) that decays concurrently with the formation of the photoenols. The Z,E enol is very short lived and decays by an allowed 1,5-hydrogen shift to regenerate the starting material; its lifetime is < 30 ns, 280 ns, 1.4 µs, and 90 ns, in benzene, acetonitrile, methanol, and trifluoroethanol, respectively. The Z,E enol is stabilized in hydroxylic solvents, although the acidity of trifluoroethanol seems to promote reketonization. E,E Enol lifetimes range from 80 µs (trifluoroethanol) to 47 µs (benzene) and its decay involves cyclization leading to 10-phenylanthrone following oxidation of the appropriate dihydroanthracene formed initially.
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Bardin, Julie, Alan R. Kennedy, Li Ven Wong, Blair F. Johnston, and Alastair J. Florence. "Nicotinamide–2,2,2-trifluoroethanol (2/1)." Acta Crystallographica Section E Structure Reports Online 65, no. 4 (March 11, 2009): o727—o728. http://dx.doi.org/10.1107/s1600536809007594.

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Lohani, Sachin, Yuegang Zhang, Leonard J. Chyall, Patricia Mougin-Andres, Francis X. Muller, and David J. W. Grant. "Carbamazepine–2,2,2-trifluoroethanol (1/1)." Acta Crystallographica Section E Structure Reports Online 61, no. 5 (April 16, 2005): o1310—o1312. http://dx.doi.org/10.1107/s1600536805010299.

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Malhotra, R., and L. A. Woolf. "Thermodynamic properties of 2,2,2-trifluoroethanol." International Journal of Thermophysics 12, no. 2 (March 1991): 397–407. http://dx.doi.org/10.1007/bf00500760.

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Storrs, Richard W., Dagmar Truckses, and David E. Wemmer. "Helix propagation in trifluoroethanol solutions." Biopolymers 32, no. 12 (December 1992): 1695–702. http://dx.doi.org/10.1002/bip.360321211.

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Dissertations / Theses on the topic "Trifluoroethanol"

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Wilson, Peter. "A novel route to fluoroarenes from trifluoroethanol." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24542.

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This Thesis describes the preparation of fluoroarenes using a palladium-catalysed coupling/electrocyclisation methodology. Difluoroenolzinc coupling partners, 1-(N,N-diethylcarbamoyloxy)-2,2-difluoro-1-zinc chloride and 2,2-difluoro-1-(2'-methoxy-ethoxymethoxy)-1-zinc chloride were prepared from trifluoroethanol at near ambient temperature and underwent Negishi coupling with a range of aryl-halides. A co-solvent (N,N-dimethylpropylene urea) was necessary to generate 2,2-difluoro-1-(2'-methoxy-ethoxymethoxy)-1-zinc chloride in good yield. The zinc coupling partners were also converted to (iodo)difluoroenols which participated in Suzuki-Miyaura coupling with a range of aryl-boronic acids and potassium aryl-trifluoroborates. Side reactions of the Suzuki-Miyaura couplings were circumvented by using tertiary butanol as the reaction solvent. Low temperature preparation of trifluoroborate coupling partners, potassium 2,2-difluoro-1-(N,N-diethylcarbamoyloxy)ethenyl trifluoroborate and potassium 2,2-difluoro-1-(2'-methoxy-ethoxymethoxy)ethenyl trifluoroborate, from trifluoroethanol was also accomplished. The trifluoroborates underwent Suzuki-Miyaura coupling with a range of aryl-halides. This Suzuki-Miyaura coupling protocol was used to prepare a range of fluorinated electrocyclisation precursors in modest to good yield. Subsequent electrocyclisation afforded fluorobenzene, fluoronaphthalene and fluorophenanthrene species. The electrocyclisations were investigated computationally in an attempt to rationalise the ease/difficulty of cyclisation.
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Yiu, Chin Pang. "p53tet folding and unfolding transition states in 2,2,2-trifluoroethanol." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619831.

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Lu, Hui. "Studies of protein folding and unfolding using NMR and optical methods." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337421.

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VISENTIN, CRISTINA. "Use of a technological platform to screening in vitro and in vivo anti-amyloidogenic drugs able to prevent early neurodegenerative process." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/158278.

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Amyloidoses are protein misfolding diseases caused by deposition of fibrillar proteins in target organs. Nowadays, most of them are still incurable and their relevance to public health system is growing, especially as a consequence of population aging. Spinocerebellar ataxia type 3 is a member of this group of pathologies and its causative agent is ataxin-3 (ATX3). This is consists of a globular N-terminal (JD), followed by a flexible tail carrying a poly-glutamine (polyQ) tract. An expanded polyQ tract triggers the aggregation. In this work, I have investigated the capability of tetracycline (Tetra), epigallocatechin-gallate (EGCG), epigallocatechin (EGC), gallic acid (GA) and trifluoroethanol (TFE) to interfere with ATX3 amyloid deposition. Tetra is an antibiotic recently re-evaluated as anti- amyloidogenic compound. EGCG, EGC and GA, which are natural polyphenols, are already known in literature for their anti-amyloidogenic effect; finally, TFE is an osmolyte that stabilizes secondary structure, preferentially α-helix. Data obtained by aggregation assay, spectroscopic analyses (NMR, FTIR) and morphologic characterisation clearly demonstrated Tetra capability of increasing ATX3 aggregates solubility, without a substantial remodelling of the internal structure. Nevertheless, this antibiotic reduced the toxicity of the oligomeric species and ameliorated ataxic C. elegans phenotype. On the contrary, the analysed polyphenols were capable to interfere with ATX3 aggregation but, instead of preventing, they accelerated the aggregation rate redirecting the process towards the formation of soluble, not toxic, off-pathway aggregates. All compounds were also active against the JD in isolation, but only the polyphenols were capable to bind the monomeric form. In particular, they overlapped specific aggregation-prone regions directly involved in the fibrillation. This could explain their capability of redirecting the aggregation pathway and the different mode of action with respect to Tetra. These polyphenols showed a remarkable reduction of ATX3-mediated cytotoxicity and mitigation of ataxic phenotype in C. elegans and E. coli models. However, the compounds displayed a different efficacy, whereby EGCG was the most and GA the least effective. All data strongly support the idea that GA is the minimal functional unit of EGCG. TFE did not show the capability of preventing aggregation; in fact, even at very low concentration it promotes a faster amyloid-like aggregation. Biophysical characterization of its effect on JD aggregation, instead, provided evidence that ATX3 aggregation proceeds along a new identified pathway by which protein misfolding follows protein aggregation. In fact, TFE induces the formation of a native-like state almost indistinguishable from fully native protein, but more aggregation prone.
Amyloidoses are protein misfolding diseases caused by deposition of fibrillar proteins in target organs. Nowadays, most of them are still incurable and their relevance to public health system is growing, especially as a consequence of population aging. Spinocerebellar ataxia type 3 is a member of this group of pathologies and its causative agent is ataxin-3 (ATX3). This is consists of a globular N-terminal (JD), followed by a flexible tail carrying a poly-glutamine (polyQ) tract. An expanded polyQ tract triggers the aggregation. In this work, I have investigated the capability of tetracycline (Tetra), epigallocatechin-gallate (EGCG), epigallocatechin (EGC), gallic acid (GA) and trifluoroethanol (TFE) to interfere with ATX3 amyloid deposition. Tetra is an antibiotic recently re-evaluated as anti- amyloidogenic compound. EGCG, EGC and GA, which are natural polyphenols, are already known in literature for their anti-amyloidogenic effect; finally, TFE is an osmolyte that stabilizes secondary structure, preferentially α-helix. Data obtained by aggregation assay, spectroscopic analyses (NMR, FTIR) and morphologic characterisation clearly demonstrated Tetra capability of increasing ATX3 aggregates solubility, without a substantial remodelling of the internal structure. Nevertheless, this antibiotic reduced the toxicity of the oligomeric species and ameliorated ataxic C. elegans phenotype. On the contrary, the analysed polyphenols were capable to interfere with ATX3 aggregation but, instead of preventing, they accelerated the aggregation rate redirecting the process towards the formation of soluble, not toxic, off-pathway aggregates. All compounds were also active against the JD in isolation, but only the polyphenols were capable to bind the monomeric form. In particular, they overlapped specific aggregation-prone regions directly involved in the fibrillation. This could explain their capability of redirecting the aggregation pathway and the different mode of action with respect to Tetra. These polyphenols showed a remarkable reduction of ATX3-mediated cytotoxicity and mitigation of ataxic phenotype in C. elegans and E. coli models. However, the compounds displayed a different efficacy, whereby EGCG was the most and GA the least effective. All data strongly support the idea that GA is the minimal functional unit of EGCG. TFE did not show the capability of preventing aggregation; in fact, even at very low concentration it promotes a faster amyloid-like aggregation. Biophysical characterization of its effect on JD aggregation, instead, provided evidence that ATX3 aggregation proceeds along a new identified pathway by which protein misfolding follows protein aggregation. In fact, TFE induces the formation of a native-like state almost indistinguishable from fully native protein, but more aggregation prone.
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Gordon, Isobel M. "Kinetic and product analytical study of the effect of substituents upon the solvolysis of benzyl azoxytosylate in aqueous trifluoroethanol." Thesis, University of Stirling, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257509.

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Abdelsayed, Victor Maher. "Experimental Studies on Nucleation, Nanoparticle's Formation and Polymerization from the Vapor Phase." VCU Scholars Compass, 2004. http://scholarscompass.vcu.edu/etd/1109.

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This research is divided into three major parts. In part I, the critical supersaturations required for the homogeneous nucleation of 2,2,2-trifluorothanol (TFE) vapor have been measured over a temperature range (266-296 K) using an upward thermal diffusion cloud chamber (DCC). The measured supersaturations are in agreement with the predictions of both the classical and the scaled theory of nucleation. Moreover, the condensation of supersaturated TFE vapor on laser-vaporized magnesium nanoparticles has been studied under different experimental conditions, such as the supersaturation, the pressure and the electric field. In part II, the laser vaporization controlled condensation (LVCC) technique was used to prepare Au-Ag alloy nanoparticles in the vapor phase using designed targets of compressed Au and Ag micron-sized powder mixtures of selected composition. The results showed that the optical properties of these nanoparticles could be tuned depending on the alloy composition and the laser wavelength. Different intermetallic nanoparticles (FeAl and NiAl) from the vapor phase has also been prepared, using the same approach.In this work, the fraction of the charged particles generated during the laser vaporization process was used to prepare a new class of nanoparticle assemblies in the LVCC chamber under the influence of an electric field. The results showed that the electric field required to induce the formation of these nanoassemblies is material and field dependent. By coupling the LVCC chamber with the differential mobility analyzer, size-selected nanoparticles have been prepared in the vapor phase. The prepared nanoparticles were characterized by different techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-visible spectroscopy. In part III, new methods were developed to prepare nanoparticle-polymer composites from the vapor phase. In the first method, the LVCC method was used to prepare a carbonaceous cross-linked resin, with different nanoparticles (Ni, Pt and FeAl) embedded inside. In the second method, free radical-thermally initiated polymerization was used to polymerize a monomer vapor of styrene on the surfaces of activated Ni nanoparticles.
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Jayaraman, Saikumar. "Synthesis and characterization of high Tg nanofoams based on pyromellitic dianhydride and 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane polyimide block and graft copolymers." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-05222007-091419/.

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Almeida, Ana Sofia Fraga de. "Conformational and functional alterations on an aspartic proteinase promoted by trifluoroethanol." Doctoral thesis, 2010. http://hdl.handle.net/10316/14290.

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Tese de doutoramento em Bioquímica (Enzimologia), apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra
O estudo das proteinases aspárticas tem vindo a ganhar interesse devido à importância desta classe de enzimas na etiologia e evolução de doenças humanas que são hoje fonte duma preocupação crescente, como são os casos da doença de Alzheimer, do cancro da mama ou da SIDA. A base molecular de algumas destas doenças está associada a erros de folding (enrolamento), que impossibilitam a sua função. Estudos de estabilidade sobre esta classe de enzimas são de extrema importância para a caracterização dos mecanismos patológicos envolvidos, e para a descoberta de soluções terapêuticas. A proteína heterodimérica cardosina A é uma proteinase aspártica de origem vegetal que pode ser purificada em elevadas quantidades. Apesar de tradicionalmente ser usada como agente coagulante do leite na produção de queijo, as suas características fizeram dela uma enzima interessante para aplicações biotecnológicas. Esta endopeptidase tem sido considerada um bom modelo para estudos estruturais e funcionais do grupo das proteinases aspárticas e de proteínas em geral. A disponibilidade de água é um factor fundamental para a estabilidade proteica e para a sua flexibilidade conformacional, características estas essenciais à sua função. Com o presente trabalho esperamos ter contribuído para a compreensão da conformação nativa das proteinases aspárticas como uma forma mutável. Ao longo dos últimos anos a estrutura conformacional da cardosina A foi caracterizada em sistemas bifásicos, meio aquoso saturado com solventes orgânicos, e mais exaustivamente na presença do solvente orgânico acetonitrilo. Na sequência do trabalho desenvolvido pelo nosso grupo, o unfolding (desenrolamento) da cardosina A foi induzido pelo 2,2,2-trifluoroethanol (TFE), um solvente orgânico polar e prótico com propriedade muito diferentes dos solventes orgânicos previamente usados. As características do TFE promovem alterações distintas na estrutura da água, interagindo de um modo particular com a camada de hidratação da proteína e com a própria estrutura proteica. Além disso o TFE é conhecido por estabilizar conformações complexas em vez de induzir a desnaturação. Foi objectivo do presente trabalho seguir as alterações conformacionais e funcionais promovidas pela proximidade do TFE à estrutura da cardosina A. A dependência da função enzimática em relação à estrutura proteica foi relacionada com a disponibilidade de água e/ou de pontes de hidrogénio na superfície da proteína. Diferentes métodos espectroscópicos (dicroísmo circular e fluorescência intrínseca), medições de actividade enzimática, e análise calorimétrica foram utilizados para detectar e caracterizar os estados induzidos pelo solvente orgânico. Finalmente foram aplicadas ao sistema simulações de dinâmica molecular/mecânica molecular (MD/MM) de forma a compreender a interacção entre a proteína e as moléculas de solvente. Os ensaios in vitro com a cardosina A em TFE promoveram variações de folding dependentes da concentração do álcool. Concentrações de TFE inferiores a 4% diminuíram a estabilidade proteica, mas aumentaram reversivelmente a actividade enzimática. Concentrações superiores a 20% de TFE no meio inactivaram irreversivelmente a enzima e desenrolaram a sua estrutura terciária, enquanto o seu conteúdo secundário em hélices foi progressivamente aumentado (principalmente de segmentos sem estruturação prévia). Por último, concentrações superiores a 70% de TFE no meio inactivaram a enzima e promoveram um vasto aumento na complexidade estrutural, na forma típica de estruturas helicoidais abertas, alterações estas que provaram ser reversíveis. As simulações de MD com TFE e água, descreveram alterações locais de flexibilidade proteica, mas sem grandes transformações conformacionais. Em vez disso o modelo expôs os locais de competição entre o TFE e as moléculas de água da superfície de solvatação. Moléculas de TFE foram encontradas a substituir várias moléculas de hidratação no local activo. Apesar da molécula de água catalítica não ter sido perdida na última conformação adquirida na simulação para alto conteúdo em TFE, o local activo apresentava-se ocupado por várias moléculas de TFE, e este facto foi proposto como justificação para a perda de actividade. A mesma lógica poderá explicar a recuperação de actividade após a diluição para sistema aquoso, com a libertação do local activo para interacção com o substrato.
The study of aspartic proteases has been gaining interest due to their importance in the development of major concerning human diseases, as Alzheimer’s disease, breast cancer, or AIDS. The molecular basis of some of these diseases is associated to folding errors, which disables proteins proper functioning. Stability studies over this class of enzymes are extremely important for characterising the pathology involved mechanisms and to discover therapeutic solutions. The heterodimeric cardosin A is a plant aspartic proteinase of high yield purification. Besides having been traditionally used as milk clotting agent for cheese making, its characteristics have made it an interesting enzyme for biotechnological applications. This endopeptidase has thus been considered a good model for structural and functional studies of the aspartic proteinases group, and of proteins in general. Water availability is a fundamental factor for protein stability and conformation flexibility, and these characteristics are imperative for proper functioning. The present approach intends to upgrade the understanding of aspartic proteases native conformation as a mutable form. Along the last few years, cardosin A structural conformation has been characterized in biphasic systems, aqueous solutions saturated by organic solvents, and more extensively in the presence of the organic solvent acetonitrile. In sequence with the work developed by our group, the unfolding of cardosin A was here induced by 2,2,2-trifluoroethanol (TFE), a polar and protic organic solvent with very different properties from the previous organic solvents tested. TFE characteristics promote distinct alterations in water structure, interacting in a particular way with the protein hydration layer and with the protein structure itself. Furthermore, it is known to stabilize well ordered conformations rather than inducing denaturation. The aim of the present work was to follow the conformational and functional alterations promoted by TFE proximity to cardosin A structure. The function dependence on enzyme structure was related to the availability of water and/or of hydrogen bonds to the protein surface. Different spectroscopic methods (circular dichroism and intrinsic fluorescence), activity measurements, and calorimetric analysis were employed to detect and characterize the organic solvent induced states. Finally, molecular dynamics/molecular mechanics (MD/MM) simulations were applied to the system in order to understand the interaction between protein and solvent molecules. The TFE in vitro assays with cardosin A promoted folding variations dependent of the alcohol concentration. TFE medium content below 4% decreased protein stability, but reversibly increased its enzymatic rate. TFE medium content over 20%. irreversibly inactivated the enzyme and unfolded its tertiary structure, while secondary helical content was progressively increased (mainly from previously unordered segments). At last, TFE medium content over 70% inactivated the enzyme and promoted a vast increase in structural complexity, taking form as characteristic open helical structures, and these alterations proved to be reversible. MD simulations with TFE and water described local alterations in protein flexibility, but no large conformational transformations. Instead, the model described an exposition of local competition of TFE with water for solvation surface. TFE molecules were found replacing several hydration molecules in the active site. Despite the catalytic water was not lost in the last acquired conformation of the high TFE content MD simulation, the active site was occupied by several TFE molecules, and this occurrence was proposed to justify the activity loss. The same reasoning can explain the activity recovery upon aqueous dilution, with the release of the active site for substrate binding.
Fundação para a Ciência e a Tecnologia, Portugal (projecto POCTI/QUI/60791/2004 e bolsa de doutoramento SFRH/BD/10754/2002)
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WU, HO-SHENG, and 吳和生. "STUDY ON THE DISPLACEMENT REACTION OF PHOSPHAZENE WITH TRIFLUOROETHANOL BY PHASE TRANSFER CATALYSIS." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/93007494522398601149.

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博士
國立清華大學
化學工程研究所
79
In the present study, polytrifluoroethoxycyclotri-phosphazene was synthesized by reacting 2,2,2-trifluoroethanol with hexachlorocyclotriphosphazene by phase transfer catalysis in an organic solvent and alkaline solution. The synthesized products can be used as pressurized hydrulic fluids, flame retartants and lubricants. The purpose of the present study is to understand the substitution reaction of chloride from hexachlorocyclotriphosphazene by trifluoroethanol by phase transfer catalysis. The kinetics, mass transfer effect and effect of concentration in each p hase are discussed. Several rigid conclusions were obtained: (i) The substitution reaction was enhanced and the hydrolysis of hexachlorocyclotriphosphazene decreased by adding a small quantity of phase transfer catalyst. An effective method of pressurized column chromatography was provided to separate the six distributed products. The reaction followed a trans-nongeminal replacement pattern with no other isomers. Furthermore, the electronic density effect and the steric effect were employed to explain the relative reaction reactivity of the six distributed products. (ii) Changing the initial concentration of hexachlorocyclotriphosphazene affected the value of pseudo first order reaction rate constant. Hence, the reaction rate was limited by the mass transport of phase transfer catalyst in the two-phase reaction. Pseudo first order reaction model was successfully used to explain the relation between reaction parameters and pseudo first ordeer reaction rate constant. (iii) Based on the experimental data, the reactivities of all kinds of catalysts in the organic phase were the same for the reaction mechanism. The effectiveness of a phase transfer catalyst depends highly on the organophilicity. The retarding effect of free acids on the substitution process can be attributed to the masking of the anion and the deactivation of the anion via hydrogen bonding. (iv) In order to overcome the difficulty of separating of the catalyst from the final product, the catalyst was immobilized on a polymer support, i.e., triphase catalyst. The polymer support is the copolymer of styrene and chloromethylstyrene, using divinylbenzene as a curing agent. The mass transfer limitation influences the triphase reaction rate. The particle diffusion and intrinsic reactivity limit the displacement reaction in the organic phase. The film diffusion of the aqueous phase limits in the ion-exchange step. The organophilic structure of polymer support increased the displacement reaction in the organic phase, but the rate determining step is the noncontineous phase between aqueous phase and organic phase. (v) In addition, the reaction rate increased by increasing the concertration sodium trifluoroethoxy which is water-reactant. Increasing the concentraction of salts, sodium chloride and sodium hydroxide, decreased the reaction rate. 本論文所研究之反應系統為六氯環三偶磷氮(hexachloro-cyclotriphosphazene; (NPC12)3) 和三氟乙醇(2,2,2-trifluoroethanol; HOCH2CF3)在油相溶劑／水相鹼性 溶液，藉著相間轉移觸媒進行置換反應。因反應為系列反應(series reaction) ，產 物為多三氟乙醇基環三偶磷氮(poly(2,2,2-trifluoro-ethanoxy) cyclotriphosphazene)，其主要用途為液壓流體，阻燃劑和潤滑劑等。 在本論文裡，主要探討利用相間轉移觸媒技術進行六氯環三偶磷氮和三氟乙醇之合成 置換反應，動力學行，質傳效應，水油兩相濃度現象及理論之相關問題。由研究中獲 得下列肯定之結論如下： (i) 本論文以相間轉移觸媒技術進行六氯環三偶磷氮和三氟乙醇之置換反應，有效的 增進反應速率且消除了六氯環三偶磷氮水解現象。由加壓管層析法得產物之反應途徑 為反式－非孿式(trans-nongeminal)途徑，藉著動力學參數（反應速率常數，活化能 和熵）和電子效應(electronic effect) 及立體障礙效應(steric effect) 合理解釋 此系列反應置換型態。 (ii)在兩相反應，因虛擬一次反應速率常數(pseudo first order reaction rate constant) 會隨著最初加入之油相反應物六氯環三偶氮濃度不同而改變，因而得知在 兩相反應中相間轉移觸媒在兩相界面質量傳送受阻。推導出虛擬一次反應模式，成功 地解釋兩相反應參數和虛擬一次反應速率常數之關係。而且得知兩相質量傳送主要阻 力，乃來自於氯化四丁基銨由油相傳至水相之質量傳送。 (iii) 由實驗知，相間轉移觸媒（四級銨鹽）其反應能力相差不多，最大不同在其親 油性性質。在反應條件下加入過量的酸（三氟乙醇），則因其和三氟乙醇基四丁基銨 複合，會使得反應能加降低。 (iv)由於兩相相間轉移觸媒不易回收，故把相間轉移觸媒固定於由苯乙烯(styrene ) ，氯甲基苯乙烯(chloromethy1-styrene)和二乙烯基苯(diviny1benzene)所合成的高 分子擔體上，以利於回收，而成為三相觸媒。在本論文利用三相觸媒合成偶磷氮化合 物，發現油相置換反應受到擔體顆粒擴散和本質化學反應控制，水相離子交換反應受 到薄膜擴散控制。在所研究的三相觸媒擔體結構，親油性結構有利油相置換反應，但 擔體內的水油兩相分配卻為決定反應速率之主要因素。 (v) 在反應中水相具有三氟乙醇鈉，氫氧化鈉和氯化鈉三種鹽類，除三氟乙醇鈉為反 應物，增加其量會增加反應速率外，不論在兩相或三相反應，過量的鹽類濃度將會改 變有效烷氧基相間轉移觸媒濃度都不利於反應速率。
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Chen, Jian-cheng, and 陳建成. "Molecular simulations of the physical states of Ethanol and 2,2,2-trifluoroethanol in 1-butyl-3-methylimidazolium hexafluorophoasphate." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/55716666133908901156.

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碩士
國立成功大學
化學系專班
97
Molecular dynamics simulations have been used to study the diffusion and conductivity properties for diluent 2,2,2-trifluoroethanol (CF3CH2OH) and ethanol (CH3CH2OH) in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BMIPF6) at 300 K with diluent mole fraction of 0.25, 0.45 and 0.65. The interactions between BMI+ and PF6－ ions were explored from a microscopic point of view. The simulated diffusion coefficients and specific conductivities increase with the increase of diluent content, the values of which agree well with experiments. The diffusion rate of ions is faster in CF3CH2OH containing system, probably due to large dielectric constant and molecular volume of diluent. In CF3CH2OH containing system, the oxygen atom of hydroxyl group forms hydrogen bond with H2 atom (the hydrogen atom between two nitrogen atoms of five-membered ring) of BMI+ ion.The hydrogen bond is also formed between the hydrogen atom of hydroxyl group and fluorine atom of PF6－ ion. These interactions are stronger than those in ethanol containing system. The result is consistent with the observed downfield tendency of H2 chemical shift from nuclear magnectic resonance. Similar result is also obtained for the chemical shift of fluorine atom of PF6－ ion. The fraction of free cation and anion increases with the diluent content, whose value is relatively large for CF3CH2OH containing system. The number of coordinating PF6－ ions around BMI+ ion drecreases with the addititon of diluent. By contrast, the number of coordinating diluent molecules around BMI+ increases. The substitution effect is most pronounced as CF3CH2OH is added, due to it’s strong hydrogen bond ing ability with H2 atom of BMI+ ion. Based on this work, the surroundings around the BMI+ ion is now clear, which is believed to be helpful for the microscopic explanation of experimental observations.
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Books on the topic "Trifluoroethanol"

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F, Gratz Roy, and United States. National Aeronautics and Space Administration., eds. Thermo-oxidatively stable condensation polyimides containing 1,1,1-triaryl-2,2,2-trifluoroethane dianhydride and diamine monomers. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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F, Gratz Roy, and United States. National Aeronautics and Space Administration., eds. Thermo-oxidatively stable condensation polyimides containing 1,1,1-triaryl-2,2,2-trifluoroethane dianhydride and diamine monomers. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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F, Gratz Roy, and United States. National Aeronautics and Space Administration., eds. Thermo-oxidatively stable condensation polyimides containing 1,1,1-triaryl-2,2,2-trifluoroethane dianhydride and diamine monomers. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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2,2-Dichloro-1,1,1-Trifluoroethane (HCFC-123). Geneva: World Health Organization, 2000.

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Book chapters on the topic "Trifluoroethanol"

1

Wohlfarth, Ch. "Viscosity of 2,2,2-trifluoroethanol." In Supplement to IV/18, 96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_41.

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Wohlfarth, Christian. "Viscosity of 2,2,2-trifluoroethanol." In Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_36.

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Wohlfarth, Ch. "Dielectric constant of 2,2,2-trifluoroethanol." In Supplement to IV/6, 116. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75506-7_48.

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Wohlfarth, Ch. "Surface tension of 2,2,2-trifluoroethanol." In Supplement to IV/16, 50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75508-1_26.

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Wohlfarth, Christian. "Static dielectric constant of 2,2,2-trifluoroethanol." In Static Dielectric Constants of Pure Liquids and Binary Liquid Mixtures, 17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48168-4_16.

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Wohlfarth, Ch. "Viscosity of the mixture (1) water; (2) 2,2,2-trifluoroethanol." In Supplement to IV/18, 715. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_442.

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Wohlfarth, Ch. "Viscosity of the mixture (1) 2,2,2-trifluoroethanol; (2) tetrahydrofuran." In Supplement to IV/18, 1197–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_693.

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Wohlfarth, Ch. "Viscosity of the mixture (1) 2,2,2-trifluoroethanol; (2) tetrahydropyran." In Supplement to IV/18, 1199–200. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_694.

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Wohlfarth, Ch. "Viscosity of the mixture (1) 2,2,2-trifluoroethanol; (2) quinoline." In Supplement to IV/18, 1201–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_695.

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Wohlfarth, Ch. "Dielectric constant of the mixture (1) water; (2) 2,2,2-trifluoroethanol." In Supplement to IV/6, 512. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75506-7_323.

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Conference papers on the topic "Trifluoroethanol"

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Lupachev, Egor V., Andrei V. Polkovnichenko, and Nikolai N. Kulov. "Purification of organic fluorine alcohols from azeotropic mixtures with non-fluorinated alcohols using extractive distillation." In INTERNATIONAL SCIENTIFIC-TECHNICAL SYMPOSIUM (ISTS) «IMPROVING ENERGY AND RESOURCE-EFFICIENT AND ENVIRONMENTAL SAFETY OF PROCESSES AND DEVICES IN CHEMICAL AND RELATED INDUSTRIES». The Kosygin State University of Russia, 2021. http://dx.doi.org/10.37816/eeste-2021-1-239-241.

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The extractive distillation process of 2,2,2-trifluoroethanol – isopropanol azeotropic mixture using N-methyl-2-pyrrolidone as a separating agent has been experimentally studied. The experiments were carried out on a batch column with regular packing. The results are shown that using this separating agent makes it possible to eliminate thermodynamic constraints imposed by binary azeotrope and to recover 2,2,2-trifluoroethanol with a purity of more than 0,99.
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Bogdal, Dariusz, and Szczepan Bednarz. "A preliminary study on microwave assisted metal-free epoxidation of cyclic olefins by hydrogen peroxide – trifluoroethanol system." In The 12th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2008. http://dx.doi.org/10.3390/ecsoc-12-01253.

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Jarvis, David, Angela Edwards, and Narayan Bhattarai. "Extraction and Production of Keratin-Based Nanofibers for Biomedical Applications." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64501.

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Keratin, a natural biomaterial found within the hair, nails, and epidermis of humans, has shown promise of being a useful material for tissue engineering scaffolds and drug delivery systems, due in part to its favorable biological qualities. The scaffolds generated by electrospinning are useful in proliferating cells, and can even biodegrade over time, reducing the impact on the body and not invoking any adverse tissue response. This research details the extraction process of keratin from human hair, and using electrospinning to weave the keratin into nanofibrous polymers. Using a synthetic polymer solution, for example, polycaprolactone (PCL) in trifluoroethanol (TFE), keratin was easily mixed and successfully electrospun into nanofibers. The fiber formation characteristics and nanofiber morphology was studied under a scanning electron microscope (SEM).
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Seifert, Nathan, Yunjie Xu, Wolfgang Jäger, and Javix Thomas. "CHARACTERIZATION OF INTERMOLECULAR INTERACTIONS AT PLAY IN THE 2,2,2-TRIFLUOROETHANOL TRIMERS USING CAVITY AND CHIRPED-PULSE MICROWAVE SPECTROSCOPY." In 72nd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2017. http://dx.doi.org/10.15278/isms.2017.rg06.

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Carlson, Colton, Yunjie Xu, Nathan Seifert, Qian Yang, and Daniel Mason. "ALTERNATING 1-PHENYL-2,2,2-TRIFLUOROETHANOL CONFORMATIONAL LANDSCAPE WITH THE ADDITION OF ONE WATER: TUNNELLING AND LARGE AMPLITUDE MOTIONS." In 2022 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2022. http://dx.doi.org/10.15278/isms.2022.tm03.

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Xu, Yunjie, and Javix Thomas. "A PEPTIDE CO SOLVENT IN A CHIRALITY INDUCTION MODEL SYSTEM: BROADBAND ROTATIONAL SPECTROSCOPY OF THE 2,2,2-TRIFLUOROETHANOL- -PROPYL ENE OXIDE ADDUCT." In 69th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2014. http://dx.doi.org/10.15278/isms.2014.te11.

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Vallès, M., M. Bourouis, D. Boer, M. Nogués, A. Coronas, and A. Villanova. "Experimental Study of the Absorption Process of Organic Fluids in a Plate Heat Exchanger." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1298.

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Abstract In this paper, the absorption process in a plate heat exchanger with organic fluids has been experimentally investigated. It is well known that the absorber is the key component in absorption systems. The absorber studied consists of an adiabatic mixing chamber and a plate heat exchanger. In the mixing chamber, the solution that is poor in refrigerant is sprayed on the vapor refrigerant. Then, the two-phase mixture that is formed enters into the plate heat exchanger where the absorption process is completed by cooling the solution. Experiments have been performed using the organic fluid mixtures: Methanol-Tetraethyleneglycol dimethylether (TEGDME) and Trifluoroethanol (TFE)-TEGDME. The effect of the solution mass flow rate, the absorber pressure and the cooling water temperature on the absorber performance has been analyzed. The results obtained are discussed in terms of the absorber load, subcooling of the solution at the outlet of the absorber, overall heat transfer coefficient and absorbed mass flux. The information achieved should serve to understand better the absorption process for such mixtures and design an absorber using plate heat exchangers for air conditioning applications.
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Inoue, Naoyuki, Atsushi Kaneko, Hiroyoshi Watanabe, Tomoyuki Uchimura, and Kiichi Irie. "Development of Electric Power Generation Unit Driven by Waste Heat: Study on Working Fluids and Expansion Turbines." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27749.

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This paper presents the results of the development of a simple and compact power generator driven by waste heat, assuming hot water at a temperature of 80 to 90°C as a heat source. Firstly, a feasibility study on the characteristics of a low temperature power cycle (evaporated at 77°C, condensed at 42°C) was conducted. As a result, TFE (Trifluoroethanol CF3CH2OH), R123, F245fa were selected as suitable for the cycle to optimize the cycle efficiency. Experimental validation of the power generator in which TFE was adopted as a working fluid was also conducted. A radial turbine was adopted as an expander, and was newly designed using an inverse design method, whereby the 3-D blade geometry for specified blade loading distribution was numerically obtained. Turbine performance and flow fields were then validated by CFD (Computational Fluid Dynamics). The test equipment was driven by hot water as a heat source and cooling water as a cooling source, and the generated power was connected with the electric utility. The characteristics of the power generating cycle and those of the turbine were obtained experimentally. The experimental results of the expander turbine performance, using TFE as a working fluid, showed good agreement with CFD results.
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Ji, Yali, Isaac Rodriguez, and Gary L. Bowlin. "Electrospinning of Chitin Whisker-Reinforced Nanocomposite Fibrous Scaffolds." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80104.

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Chitin is the second most abundant biopolymer next to cellulose and possesses many favorable properties such as non-toxicity, high crystallinity, biocompatibility and biodegradability. Acid-treatment of chitin can dissolve regions of low lateral order, resulting in elongated rod-like nanocrystals, termed “whiskers”. Chitin whiskers (CWs) are an emerging and novel nanofiller that have been shown to bring about reinforcing effects on both synthetic and natural polymeric structures. The biocompatibility and biodegradability also make it one of the most promising fillers.1 However; it was thought that CWs can only well disperse in aqueous solution, and poorly disperse in organic solvents, which to some extent restricts the development of CW-based nanocomposites. In a previous study, we found that the CW can be well dispersed in 1,1,1-trifluoroethanol (TFE) solvent which is a good solvent for commonly used biodegradable polymers such as polycaprolactone (PCL), polylactide (PLA) and polydioxanone (PDO). Thus, it is possible to blend CWs with these biopolymers to prepare nanocomposite scaffolds. Electrospinning is a rather simple and promising technique to fabricate scaffolds, since the resulting microstructures are similar to the extracellular matrix (ECM) with potential facilitate the design of surgical implants and promote tissue regeneration. Thus, the focus of this work was to develop CW-reinforced nanocomposite fiber scaffolds via electrospinning and investigate their mechanical and biological properties, expecting them to be potential candidates for bone tissue engineering applications.
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Shin, Y. "350. Exposure to 1,1-Dichloro-2,2,2-Trifluoroethane in the Manufacture of Industrial Air-Conditioners." In AIHce 1999. AIHA, 1999. http://dx.doi.org/10.3320/1.2763205.

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Reports on the topic "Trifluoroethanol"

1

Anderson, Camille O., Susanne Spiegelberg, John M. Prausnitz, and Harvey W. Blanch. Effect of secondary structure on the interactions of peptide T4 LYS (11-36) in mixtures of aqueous sodium chloride and 2,2,2,-Trifluoroethanol. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/837230.

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Holcomb, Cynthia D. Selected thermodynamic properties for mixtures of R-32 (Difluoromethane), R-125 (Pentafluoroethane), R-134A (1,1,1,2-Tetrafluoroethane), R-143A (1,1,1-Trifluoroethane), R-41 (Fluoromethane), R-290 (Propane), and R-744 (Carbon Dioxide). Gaithersburg, MD: National Bureau of Standards, 1997. http://dx.doi.org/10.6028/nist.tn.1397.

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