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Academic literature on the topic 'Polyfunctional compound'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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Journal articles on the topic "Polyfunctional compound"

Petráková, Eva, Jan Schraml, Ján Hirsch, Magdalena Kvíčalová, Jan Zelený, and Václav Chvalovský. "Analysis of oligosaccharides. 29Si and 13C NMR spectra of pertrimethylsilylated oligosaccharides derived from xylopyranose." Collection of Czechoslovak Chemical Communications 52, no. 6 (1987): 1501–13. http://dx.doi.org/10.1135/cccc19871501.

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29Si and 13C chemical shifts are reported for a series of 30 pertrimethylsilylated oligosaccharides containing xylopyranosyl unit. The number of lines in 29Si NMR spectra is in all cases in agreement with the number of hydroxyl groups present in the parent compound prior to trimethylsilylation. The results demonstrate the usefulness of 29Si NMR spectroscopy for the analysis of oligosaccharides and other polyfunctional compounds. The validity of direct additivity of 13C chemical shifts is tested on some model trisaccharides.

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Vivod, Vera, C. Q. Yang, and Bojana Voncina. "Non-Formaldehyde Polyfunctional Crosslinking System for Cotton." Advanced Materials Research 441 (January 2012): 5–9. http://dx.doi.org/10.4028/www.scientific.net/amr.441.5.

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Crosslinking of cotton with polycarboxylic acid, applied with catalysts based on phosphorus-containing inorganic acids, produces fabrics with excellent smooth-drying properties, which release no formaldehyde at any stage of preparation or on storage. If polycarboxylic acid has three or more carboxylic acid groups, the formation of such an anhydride can occur more than once and crosslinking of the cellulose molecule occurs. In our research work the use of an unsaturated bifunctional acid (maleic acid) and a phosphorus-containing inorganic compound (sodium hydroxyphosphinite) to obtain durable press finishing properties and flame retardant properties was studied.

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Abderrezak, Meriem K., Kristýna Šichová, Nancy Dominguez-Boblett, Antoine Dupé, Zahia Kabouche, Christian Bruneau, and Cédric Fischmeister. "Cross metathesis of unsaturated epoxides for the synthesis of polyfunctional building blocks." Beilstein Journal of Organic Chemistry 11 (October 8, 2015): 1876–80. http://dx.doi.org/10.3762/bjoc.11.201.

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The cross metathesis of 1,2-epoxy-5-hexene (1) with methyl acrylate and acrylonitrile was investigated as an entry to the synthesis of polyfunctional compounds. The resulting cross metathesis products were hydrogenated in a tandem fashion employing the residual ruthenium from the metathesis step as the hydrogenation catalyst. Interestingly, the epoxide ring remained unreactive toward this hydrogenation method. The saturated compound resulting from the cross metathesis of 1 with methyl acrylate was transformed by means of nucleophilic ring-opening of the epoxide to furnish a diol, an alkoxy alcohol and an amino alcohol in high yields.

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MacKay, Allison A., and Dharni Vasudevan. "Polyfunctional Ionogenic Compound Sorption: Challenges and New Approaches To Advance Predictive Models." Environmental Science & Technology 46, no. 17 (August 24, 2012): 9209–23. http://dx.doi.org/10.1021/es301036t.

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Mohareb, R. M., and S. M. Fahmy. "Reaction of Malononitrile and Ethyl Cyanoacetate: a Novel Synthesis of Polyfunctional Pyridine Derivatives." Zeitschrift für Naturforschung B 40, no. 11 (November 1, 1985): 1537–40. http://dx.doi.org/10.1515/znb-1985-1120.

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Malononitrile reacts with ethyl cyanoacetate to give a polyfunctional substituted pyridine derivative 5. The latter compound reacts with aniline, hydrazines and aromatic aldehydes to give condensated products. The active methylene of 5 couples with benzenediazonium chloride to give the phenylhydrazone derivative which cyclises readily to give a pyrido[2,3-d]pyridazine derivative. 5 reacts with trichloroacetonitrile, and carbon disulphide to give fused heterocyclic derivatives.

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Perminova, Daria A., Victor S. Malkov, Irina Kurzina, Tatiana B. Babushkina, and Anton M. Nachkebiya. "Effect of Bicyclic Polyfunctional Modifier (BPM) on the Characteristics of Wood Composite Materials Based on Urea Formaldehyde Oligomers." Advanced Materials Research 880 (January 2014): 32–35. http://dx.doi.org/10.4028/www.scientific.net/amr.880.32.

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The paper represents the results of research related to the application of urea and glyoxal condensation product to modify the urea-formaldehyde resins (UF resins) aiming to obtain low-toxicity wood plates on the basis thereof. It was stated that the bicyclic polyfunctional compound is an effective modifier which not only does allow reducing the toxicity of wood-composite materials based on UF resins, but also increasing their physical-mechanical characteristics.

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Kawauchi, Takehiro, Tsubasa Osawa, Shunichiro Matsumura, Takuto Mori, Nobuyuki Furukawa, Kazunori Ishikawa, Koju Iwasaki, and Tsutomu Takeichi. "High-Performance Polybenzoxazine Derived from Polyfunctional Benzoxazine Composed of an Oligonuclear Phenolic Compound Having a 4,4′-Dimethylenebiphenyl Linker." Macromolecular Chemistry and Physics 220, no. 1 (September 20, 2018): 1800317. http://dx.doi.org/10.1002/macp.201800317.

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Kawauchi, Takehiro, Tsubasa Osawa, Shunichiro Matsumura, Takuto Mori, Nobuyuki Furukawa, Kazunori Ishikawa, Koju Iwasaki, and Tsutomu Takeichi. "High-Performance Polybenzoxazine Derived from Polyfunctional Benzoxazine Composed of an Oligonuclear Phenolic Compound Having a 4,4′-Dimethylenebiphenyl Linker." Macromolecular Chemistry and Physics 220, no. 1 (January 2019): 1970001. http://dx.doi.org/10.1002/macp.201970001.

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Karai, Oumaima, Sara Hajib, Serigne Abdou Khadir Fall, Salaheddine Boukhssas, Khadim Dioukhane, Younas Aouine, Brahim Labriti, Hassane Faraj, and Anouar Alami. "Comparative Study of Synthesis, Structural and Antioxidant Activity In Vitro of Some New Carboxylic α,α-diaminodiesters Derivatives." European Journal of Advanced Chemistry Research 2, no. 3 (July 13, 2021): 6–13. http://dx.doi.org/10.24018/ejchem.2021.2.3.64.

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Considering the richness of heterocyclic chemistry, and the diversity of applications it possesses, in the present work we were interested in preparing new polyfunctional α,α-diaminodiesters derived from glycine, via the N-alkylation reaction of methyl 2-azido-2-benzamidoacetate with a series of heterocyclic and non-heterocyclic carboxylic aminoesters, using different bases. The structures of the synthesized molecules were characterized by 1D and 2D NMR spectroscopy, mass spectrometry (MS-ESI) and elemental analysis. Two compounds from this series were isolated as single crystals and their chemical structures were determined by X-ray diffraction. The antioxidant effect of the synthesized compounds was tested in vitro using the free radical scavenging power (DPPH) and reducing power (FRAP) tests. The results show that the different extracts tested have a relatively high antioxidant power compared to the positive control considered, especially for the compound methyl 2-benzamido-2-(2-methoxy-2-oxo-1-phenylethyl)amino)acetate, which showed a very strong antiradical power and reducing power.

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Pi-Boleda, Bernat, María Campos, Marta Sans, Antonio Basavilbaso, Ona Illa, Vicenç Branchadell, Juan Estévez, and Rosa Ortuño. "Synthesis and Gelling Abilities of Polyfunctional Cyclohexane-1,2-dicarboxylic Acid Bisamides: Influence of the Hydroxyl Groups." Molecules 24, no. 2 (January 19, 2019): 352. http://dx.doi.org/10.3390/molecules24020352.

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New enantiomerically pure C16-alkyl diamides derived from trihydroxy cyclohexane-1,2-dicarboxylic acid have been synthesized from (−)-shikimic acid. The hydroxyl groups in these compounds are free or, alternatively, they present full or partial protection. Their gelling abilities towards several solvents have been tested and rationalized by means of the combined use of Hansen solubility parameters, scanning electron microscopy (SEM), and circular dichroism (CD), as well as computational calculations. All the results allowed us to account for the capability of each type of organogelator to interact with different solvents and for the main mode of aggregation. Thus, compounds with fully protected hydroxyl groups are good organogelators for methanol and ethanol. In contrast, a related compound bearing three free hydroxyl groups is insoluble in water and polar solvents including alcohols but it is able to gelate some low-polarity solvents. This last behavior can be justified by strong hydrogen bonding between molecules of organogelator, which competes advantageously with polar solvent interactions. As an intermediate case, an organogelator with two free hydroxyl groups presents an ambivalent ability to gelate both apolar and polar solvents by means of two aggregation patterns. These involve hydrogen bonding interactions of the unprotected hydroxyl groups in apolar solvents and intermolecular interactions between amide groups in polar ones.

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Dissertations / Theses on the topic "Polyfunctional compound"

Becker, Christian. "Systèmes polymérisables à faible retrait et études de matériaux pour la stéréolithographie à laser CO2." Vandoeuvre-les-Nancy, INPL, 1994. http://docnum.univ-lorraine.fr/public/INPL_T_1994_BECKER_C.pdf.

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Cette thèse concerne l'étude des matériaux polymérisant avec de faibles variations de volume et dont les caractéristiques mécaniques sont compatibles avec les exigences d'applications pratiques telle que la stéréolithographie. Trois méthodes de réduction du retrait et leurs applications ont été étudiées: le premier système étudié comporte un monomère polyfonctionnel, un monomère difonctionnel possédant un point d'ébullition relativement bas et un polymère thermoplastique. Lors d'une polymérisation rapide, le système développe une exothermicité importante conduisant à une séparation de phase visualisée par un système translucide et une réduction du retrait. Les résultats expérimentaux montrent que le retrait est compensé, dans le domaine séparé, par la formation de cavités sous le double mécanisme de nucléation et de cavitation. Le deuxième système consiste en l'ouverture lors de la polymérisation de monomères comportant un ou plusieurs cycles sous contraintes. Les composés bicycliques oxygènes en raison des mauvaises propriétés mécaniques des polymères correspondants ne peuvent être utilisés qu'en conjonction avec un autre polymère. Cependant, quelques rares monomères formes de groupes norbornène présentent potentiellement de bonnes caractéristiques mécaniques et un retrait faible. Le troisième système utilise les changements de masses volumiques lors du passage de l'état cristallin è l'état amorphe. La dépolymérisation du nylon a été choisie comme modèle dans l'étude de la destruction du système cristallin d'un polymère et montre la faisabilité du procédé

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La, Cascia Enrico. "Selective polyfunctional synthesis through organoboron compounds." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/398028.

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La primera part d’aquesta tesi aborda el tema de la b-boració d’iminas α,β-insaturades per la síntesi de γ-amino alcohols. Es descriu un nou mètode basat en la organocatàlisi, evitand la ultilizació de metalls de transició com catalizadors. En aquest cas el reactiu bis(pinacolat)diboron s’activa amb una base i MeOH generand in situ un bor nucleòfil que interacciona amb el doble enllaç d’imines α,β-insaturades, com sustrat acceptor. La ultilizació de fosfina és necessaria per activar el sustrat. En el cas de que la fosfina és (S)-MeBoPhoz la β-boración es produeix de forma enantioselectiva amb excessos enantiomèrics fins 70%. Una major diastereoselectividad s’obte despres de la reducció i oxidació per la formació del compost dessitjat γ-amino alcohol. De manera interesant, es pot dir que en pressència de catalitzadors de Cu, la utilización de aquesta mateixa fosfina como lligand, la enenatioselectivitat baixa fins valors moderats. S’ha tractat de utilizar aquesta mateixa via de síntesi per la preparació d’un compost bioactiu como el Tramadol. El capítulo 3, tracta d’aquesta síntesi i a pesar de que molts sistemas catalítics han estat considerats, cap ha donat un producte final òptim. La darrera part d’aquesta tesis tracta de la inserció d’un sistema diazo, tal como (trimetilsilil)diazometà), per generar compostos gem-diborans. El tractament dels compuestos gem-diborans com a bases litiadas, LiTMP, van genrar un carbanió estable el qual pot atacar compostos carbonílics como cetonas per donar lloc a la B-O eliminació via Peterson, i generar olefines gem-sililborans. Posterior funcionalizació, via Suzuki-Miyaura cross-coupling, ha estat demostrada en aquesta tesis. Més innovador ha resultat el process d’iododesililació, que ha permés la síntesi d’olefinas tetrasustituidas despres de dos acoplamients creuats selectius. S’ha pogut concluir la tesis amb la preparació de (E)-Tamoxifen amb elevats valors de selectivitat ( E/Z = 90:10).
La primera parte de esta tesis cubre el tema de la b-boración de iminas α,β-insaturadas para la síntesis de γ-amino alcoholes. Se describe un nuevo método basado en la organocatalisis, evitando la ultilización de metales de transición como catalizadores. En este caso el reactivo bis(pinacolato)diboron se activa con una base y MeOH generando in situ un boro nucleófilo que interacciona con el doble enlace de iminas α,β-insaturadas, como sustrato aceptor. La ultilización de fosfina es necesaria para activar el sustrato. Cuando la fosfina es (S)-MeBoPhoz la β-boración se produce de forma enantioselectiva con excesos enantiomericos hasta 70%. Una mayor diastereoselectividad se obtiene despues de la reducción y oxidación para la formación del compuesto deseado γ-amino alcohol. De manera interesante, se debe decir que en presencia de catalidores de Cu, la utilización de esta misma fosfina como ligando, la enenatioselectividad bajó hasta valores moderados. Se ha tratado de utilizar esta misma via de síntesis para la preparación de un compuesto bioactivo como el Tramadol. El capítulo 3, trata de esta síntesis y a pesar de que muchos sistemas catalíticos se han considerado, ninguno ha dado un producto final deseado. La última parte de esta tesis trata de la inserción de un sistema diazo, tal como (trimetilsilil)diazometano), para generar compuestos gem-diboranos. El tratamiento de los compuestos gem-diboranos con bases litiadas, tales como LiTMP, generaron un carbanion estabilizado el cual puede atacar compuestos carbonílicos como cetonas para dar lugar a la B-O eliminacion via Peterson, y dar lugar a las olefinas gem-sililboranos. Posterior funcionalización, via Suzuki-Miyaura cross-coupling, has sido demostrada en esta tesis. Incluso más innovador ha resultado el proceso de iododesililación, permitiendo la síntesis de olefinas tetrasustituidas despues de dos acoplamientos cruzados selectivos. Se ha podido concluir la tesis con la preparación de (E)-Tamoxifen con elevados valores de selectividad ( E/Z = 90:10).
The first part covered the topic of the β-boration reaction towards the synthesis of γ-amino alcohols. A new metal-free approach to the β-borylation of α,β-unsaturated imines generated in situ has been reported. In this case the diboron compound, bis(pinacolato)diboron, is activated by a base/MeOH system which generates a nucleophilic boron moiety that can interact with a α,β-unsaturated acceptor (imine). This latter is activated by a catalytic amount of phosphine. When a chiral phosphine such as (S)-MeBoPhoz is used, the β-borylation can be performed in an enantioselective manner with ee values up to 70%. After a high diasteroselective protocol of reduction and oxidation we could provide the desired γ-amino alcohol. Interestingly, when a copper salt is modified with the (S)-MeBoPhoz ligand the enantioselectivities dropped showing generally lower values of ee than the organocatalytic approach. It has been tried to apply this chemistry to the synthesis of bioactive compounds such as Tramadol This part of the manuscript covered the attempts that were made to achieve the total synthesis. Many catalytic systems have been tried but unfortunately, none of them had positive results. The last part of the thesis is based on the insertion of a diazocompound, such as (trimethylsilyl)diazomethane), to generate the gem-diboron compound 18. The treatment of compound 18 with a lithiated base, such as LiTMP, generated a stabilized carbanion which can attack carbonyl compounds like ketones to afford, after a Peterson-type B-O elimination, a gem-silylboron olefin. We demonstrated that further functionalizations, suck as Suzuki-Miyaura cross-coupling, could be performed. Even the more challenging iododesilylation was successfully allowing the synthesis of tetrasubstituted olefins after two consecutive cross-couplings. Towards this aim, the synthesis of (E)-Tamoxifen was achieved with high values of selectivity (ratio E/Z = 90:10).

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Chung, Wan-ying Cecilia. "Development of a multipolymer reaction and polyfunctional polymeric catalysts." View the Table of Contents & Abstract, 2008. http://sunzi.lib.hku.hk/hkuto/record/B39570824.

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鍾韻盈 and Wan-ying Cecilia Chung. "Development of a multipolymer reaction and polyfunctional polymeric catalysts." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39707441.

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Žáková, Dagmar. "Brněnské brownfieldy u řeky Svitavy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-391827.

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The theme of the diploma project is urban contemporary urban structure in the City of Brno. The main purpose of the selected brownfield is understanding the revitalisation of the city and gets the maximum benefit and to demonstrate the viability of the proposed development and its economic characteristics with the surrounding residential. Proposed is the public space, park and streets in this structure. The territory is located in the Brno-Husovice, near the river Svitava and surrounded by several decaying brownfield. My task was to find the right key to understand this whole area which includes the former object called motorárna - Zetor and find out the ideal solution for the future use of the complex and link it with existing structure to create functional urban organism. Currently, there is a chaotic and heterogeneous structure, which has a negative impact on the surrounding area, which is given by that the area and the surrounding buildings are isolated and hidden behind the unsightly walls. The territory is almost impenetrable, inside the area completely and the natural throughput to the river and partial recreation was supressed. With my project I was trying to create place, which will offer different city urban structure and activities for all day long. In such a place people will met and they will live, work and recreate there and use the river Svitava the right way.

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Rio, Echevarria Iria M. "Applications of surface ligand design to flotation." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/3457.

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This thesis involves the design, synthesis and testing of organic hydrophobic ligands. They would act as co-collectors in froth flotation processes to enhance the recovery of sulfidic minerals which have undergone some oxidation on processing and are not efficiently collected by the commercial reagents used in froth flotation. Strong and selective binding to iron(III) oxide/hydroxide surfaces, e.g. goethite, over unwanted silicaceous material was considered essential criteria for such new cocollectors. A general overview of froth flotation processes is given in Chapter 1 as well as a description of the analytical techniques used in this thesis and the features that the ligands must have to act as co-collectors. On the basis of the strong binding to iron(III) surfaces of the organic ligand Irgacor 419®, used commercially as a corrosion inhibitor for iron, this compound was studied as a potential co-collector. Adsorption isotherms were determined by UV-Vis spectroscopy for two carboxylic acids that may also bind strongly to goethite, the results of which are discussed in Chapter 2. Chapter 3 involves the measurement of the strength of binding of one the most widely used type of collectors for sulfide ores, potassium ethyl xanthate. Complications in the analysis of materials in solution by both ICP-OES and UV-Vis spectroscopy arose due to the instability of potassium ethyl xanthate in solution, making determination and interpretation of isotherms difficult. The determination of adsorption isotherms for 2-mercaptobenzothiazole, which showed weak binding to goethite as well as to silica, and the mode of binding of 2-mercaptobenzothiazole on copper(I) surfaces is reported in Chapter 4. A crystal structure was obtained in which four units of 2-mercaptobenzothiazole bridge two nickel atoms through the nitrogen atom and the exocyclic sulfur and is considered as a model for binding to sulfidic minerals. Chapter 5 looks at the strength of binding to goethite and silica of various hydroxamic acids. Benzohydroxamic acid was initially selected for study since hydroxamates are known to act as collectors for oxidized materials. Unpredictably, benzohydroxamic acid showed strong binding to a goethite surface and did not release any iron from the surface into solution, which would have been predicted due to its known strong chelating abilities to iron(III). The X-ray structure determination of the first example of a dinuclear Fe(III) hydroxamate complex showed this to have -oxo bridge formed by the hydroxamate unit and supports multisite attachment between this ligand and the surface, as suggested by adsoption isotherms. Simple models based on this dinucleating motif provide plausible modes of multisite attachment to a goethite surface. Competitive binding studies provided a way of ranking the ability to bind to goethite of acetohydroxamic acid, which was not suitable for analyses by either ICP-OES or UV-Vis spectroscopy. Of the ligands studied in this chapter acetohydroxamic acid was found to bind most strongly to goethite followed by benzohydroxamic acid. In Chapter 6, the attachment to goethite and silica of a series of phosphonic acids is investigated. All show a very high binding strength to goethite. Froth flotation experiments at a laboratory scale are described in Chapter 7. The types of ligand that showed strong binding to goethite in adsorption isotherms experiments were tested as co-collectors in different ores and conditions. There is not a simple correlation between adsorption isotherm data and flotation performance as co-collectors because other factors, besides strength of binding, affect the system. Benzohydroxamic acid was the ligand that increased the grade/recovery of the process in all the cases studied. Irgacor 419® enhances the grade/recovery curve for Palabora ore and phenyl malonic acid for Kennecott ore. These results support the original proposition that it may be possible to increase the recovery of oxidized particles substantially by using a blend of collectors which includes a compound to target the oxidized sites.

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Milli, Lorenzo. "Organocatalytic tandem reactions of polyfunctional compounds for the synthesis of enantioenriched heterocycles. Reazioni tandem organocatalitiche di composti polifunzionali per la sintesi di eterocicli enantioarricchiti." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3879/.

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In questo lavoro di tesi sono state sviluppate reazioni domino, tandem e procedure one-pot per ottenere eterocicli enatioarricchiti. Lo sviluppo di queste metodologie sintetiche è molto importante perché permettono di ottenere molecole complesse partendo da prodotti semplici, senza effettuare ripetuti passaggi di purificazione (stop-and-go or step-by-step synthesis). Lo scopo di questo lavoro è di ottenere derivati tetraidrofuranici modificati e derivati ossoazzolinici enantioarrichiti tramite reazioni SN2-Michael o tramite reazioni aldolica-ciclizzazione-Michael usando la catalisi asimmetrica a trasferimento di fase (PTC). Come catalizzatori PTC per imprimere enantioselezione sono stati utilizzati sali di ammonio quaternario derivati dagli alcaloidi della Cinchona. Sono state ottimizzate le condizioni di reazione (base inorganica, temperatura, solvente, tempo di reazione) per i diversi substrati presi in considerazione. I prodotti target sono stati ottenuti con buone rese, ottime diastereoselezioni ma con bassa enantioselezione. I risultati ottenuti richiedono un’ulteriore ottimizzazione e dovranno essere valutate variazioni strutturali dei nucleofili utilizzati. In this thesis were developed domino, tandem reactions and one-pot procedures to obtained enantioenriched heterocycles. The development of these methodologies is very fundamental because they allow to obtain complex molecules starting from raw materials, without carrying out repeated purification steps (stop-and-go or step-by-step synthesis). The purpose of this work is to obtain enantioenriched tetrahydrofuran and oxazoline derivatives through a SN2-Michael reaction or a aldol- cyclization-Michael reaction using the phase-transfer asymmetric catalysis (PTC). For imprint enantioselection we used Cinchona alkaloids quaternary ammonium salts derivatives. The reaction conditions (inorganic base, temperature, solvent, reaction time) were optimised for the different substrates taken into account. The target products were obtained with good yields, excellent diastereoselections but with low enantioselections. The obtained results require further optimization and structural changes in the nucleophiles used must be evaluated.

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Favre-Nicolin, Christine. "Synthèse et photopolymérisation de cristaux liquides discotiques dérivés du triphénylène." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10053.

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Les cristaux liquides discotiques ont 20 ans. La perspective d'applications exploitant le comportement photoconducteur et les caracteristiques optiques de composes de cette famille a fortement stimule leur developpement. Ces applications requierent en general une grande stabilite mecanique et thermique des proprietes anisotropes mises en jeu. Cette these decrit l'utilisation de la photopolymerisation in-situ de molecules discotiques fonctionnalisees par des groupements acrylate pour stabiliser l'ordre present dans leurs phases liquides cristallines. Cette technique de polymerisation, deja employee avec succes pour les cristaux liquides calamitiques, consiste a d'abord aligner uniformement les monomeres liquides cristallins dans la phase choisie et a ensuite amorcer la polymerisation par voie photochimique. Pour realiser cette etude, nous avons synthetise des derives de benzoates de triphenylene avec 1 a 6 groupements acrylate par molecule. La photopolymerisation de ces monomeres orientes dans la phase nematique discotique n#d conduit, selon qu'ils ont un ou plusieurs groupements acrylate, a des polymeres lineaires a chaines laterales ou a des reseaux polymerises fortement reticules. Ces derniers ont une birefringence negative stable depuis la temperature ambiante jusqu'a plus de 200c, et dont la valeur peut etre ajustee grace a la temperature de polymerisation. Ce manuscrit detaille la synthese, les proprietes liquides cristallines, et la cinetique de polymerisation des monomeres, ainsi que les caracteristiques optiques et structurales de certains des polymeres obtenus. Nous discutons l'influence de la nature chimique des differents monomeres synthetises sur les proprietes finales des materiaux apres polymerisation, et en particulier l'effet du nombre de groupements polymerisables par molecule et celui de la longueur des espaceurs. La photopolymerisation dans les phases cholesterique n#d#* et colonnaire d#h#d, ainsi que la synthese et l'etude de derives du benzene et du phenanthrene, sont egalement abordees.

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Bendaikha, Tahar. "Photopolymérisation réticulante de macromères multifonctionnels : comportement photochimique de réseaux polyacryliques tridimensionnels." Mulhouse, 1986. http://www.theses.fr/1986MULH0016.

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Cinétique de la photopolymérisation des macromères multiacrylates, influence des constituants de la résine photosensible; influence de l'oxygène sur la photopolymérisation de résines multiacrylates; influence de l'intensité lumineuse; caractéristiques des réseaux polymères photoréticulés. Photodégradation des réseaux époxy-acrylates; photooxydation des polyuréthannes acrylates réticules

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SPERRY, PASCAL. "Synthese et etude de nouveaux reseaux a forte densite de reticulation permeables a l'oxygene : application aux lentilles de contact." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13100.

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Preparation de reseaux statistiques chioniques par hydrosilylation des doubles liaisons carbone-carbone par des hydrosilanes ou hydrosiloxanes. Analyse des proprietes physiques en relation avec la structure et les teneurs respectives de monomeres (definis en silanes) et des polymeres dans les reseaux. Mesure des coefficients de permeabilite a l'oxygene en milieux aqueux par polarographie

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Books on the topic "Polyfunctional compound"

(41st), IUPAC Congress. Advanced biologically active polyfunctional compounds and composites: Health, cultural heritage and environmental protection. Edited by Lekishvili N, Zaikov, G. E. (Gennadiĭ Efremovich), 1935-, and Howell, B. A. (Bobby Avery), 1942-. New York: Nova Science, 2010.

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Book chapters on the topic "Polyfunctional compound"

Pardasani, R. T., and P. Pardasani. "Magnetic properties of copper(II) complex with polyfunctional nitroxide." In Magnetic Properties of Paramagnetic Compounds, 641–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53974-3_326.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of binuclear copper(II) complex with polyfunctional nitroxide." In Magnetic Properties of Paramagnetic Compounds, 644–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53974-3_327.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of anhydrous binuclear copper(II) complex with polyfunctional nitroxide." In Magnetic Properties of Paramagnetic Compounds, 647–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53974-3_328.

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Guido, Kickelbick, and Schubert Ulrich. "Inorganic Clusters in Organic Polymers and the Use of Polyfunctional Inorganic Compounds as Polymerization Initiators." In Molecular Materials and Functional Polymers, 13–30. Vienna: Springer Vienna, 2001. http://dx.doi.org/10.1007/978-3-7091-6276-7_2.

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Seco, Josi M., Emilio Quiqoa, and Ricardo Riguera. "Assignment of the Absolute Configuration of Polyfunctional Compounds." In The Assignment of the Absolute Configuration by NMR using Chiral Derivatizing Agents. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199996803.003.0008.

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From a practical point of view, the assignment of the absolute configuration of sec/sec 1,2- and 1,n-diols does not require the separate derivatization (two different steps with the CDA of choice) of each one of the two hydroxyl groups present in the substrate; on the contrary, it can be carried out by simultaneous derivatization of the two hydroxyls (a single step), leading to the corresponding bis-(R)- and bis-(S)-CDA esters [13, 59–61]. The most used CDAs are 9-AMA and MPA [59, 60], although 1-NMA, 2-NMA, and MTPA are also appropriate [59, 60]. This assignment has an important difference compared to that of monofunctionalized compounds [15]; this is due to the presence in the bis-(R)- and bis-(S)-derivatives of two CDA units that produce distributions of ΔδRS and ΔδSR signs that do not follow the trends found in monoderivatized compounds [13, 15, 82]. This means that the NMR spectra of the bis-CDA derivatives cannot be interpreted as if they had originated from two isolated mono-CDA derivatives [82]. Thus, the correlations described for secondary alcohols [35–39] cannot be applied to diols [59–61] because the chemical shifts and ΔδRS values result from the combination of the anisotropic effects—usually shielding—from the two CDA units and not from a single unit, as happens with monoalcohols. A result of the combination of aromatic shielding effects [59, 60] in diols is that the diagnostic protons/signals for assignment are not always the same as in isolated monoalcohols (i.e., L1/L2). For instance, in acyclic syn-1,2-diols, the diagnostic signals [59, 60] are those corresponding to the protons at the alpha positions of the OH groups (i.e., the hydrogens linked directly to the asymmetric carbons) Hα(R1) and Hα(R2) exclusively. On the other hand, in acyclic anti-1,2-diols, the diagnostic signals are from Hα(R1)/Hα(R2) together with those from R1 and R2. As in the case of monofunctional compounds, the assignment consists [13, 59, 60] in the preparation of two bis-CDA derivatives from the two enantiomers of the chosen CDA, followed by comparison of the corresponding NMR spectra and calculation of the ΔδRS (or ΔδSR in the case of MTPA) signs for Hα(R1), R1, Hα(R2), and R2.

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Muzafarov, A. M. "(Monosodiumoxy)organoalkoxysilanes (Rebrov Salts)—Polyfunctional Monomers for Silicone Syntheses." In Efficient Methods for Preparing Silicon Compounds, 179–81. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-12-803530-6.00013-5.

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KHOMUTOV, A. R., R. M. KHOMUTOV, T. O. ELORANTA, L. PERSSON, C. W. PORTER, and V. G. DZAVAKHIA. "Chemical Regulation of Polyamine Biosynthesis in Cell Cultures by Polyfunctional O-Substituted Hydroxylamines." In Enzymes Dependent on Pyridoxal Phosphate and Other Carbonyl Compounds As Cofactors, 567–69. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-08-040820-0.50117-5.

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Safi, zaki S., and Walaa Fares. "Calculation of Proton Affinity, Gas-Phase Basicity, and Enthalpy of Deprotonation of Polyfunctional Compounds Based on High Level Density Functional Theory." In Conceptual Density Functional Theory and Its Application in the Chemical Domain, 297–323. Apple Academic Press, 2018. http://dx.doi.org/10.1201/b22471-12.

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Conference papers on the topic "Polyfunctional compound"

Varlakov, Andrey P., Konstantin M. Efimov, Valeri N. Tchernonojkine, Aleksandr S. Barinov, and Olga A. Gorbunova. "Application of the Dry Polyfunctional Additives at Radioactive Waste Cementation." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4922.

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One of the known methods directed to improving of the technological cementation process, the increasing quality of a cement compound and degree of radioactive waste incorporating into a final product, is use of the various additives to a cement compound. At present there are technological processes where one or two additives in a dry loose or liquid condition in quantity of 1–10% are used. The application of these additives is directed, as a rule, to improving of one or two properties of a cement compound. The magnification of a quantity of the additives and use of them in a different aggregation state is connected with rise in the cost of the technological process. At Institute of Ecology and Technology Problems and Moscow SIA “Radon” the polyfunctional modifying additives representing dry mixtures of original macro- and microadditives to cement have been developed. The polyfunctional additive is introduced by traditional, reliable and inexpensive equipment directly into liquid radioactive waste and intermixed together with the rest of cement. The quantity of additive varies from 5 up to 20% of cement weight. The additives considerably improve all regulated properties of a cement compound (compressive strength, radionuclides leaching, frost resistance, biological resistance, etc.) and allow modifying the required properties (penetrating ability, viability, disintegration, terms of setting, viscosity etc.). Such additives are used both at cementation of solid radioactive waste and cementation of liquid radioactive waste having a complicated chemical composition, for example, containing simultaneously boric acid, sulphates and great quantity of organic compounds. It is important, that the components of the additives did not change the action in a mixture with other ones. In the report the compositions of the polyfunctional additives developed for various waste and technological processes, their properties and results of practical application are represented.

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Trefonas III, Peter, and Chris A. Mack. "Exposure dose optimization for a positive resist containing polyfunctional photoactive compound." In Advances in Resist Technology and Processing VIII, edited by Hiroshi Ito. SPIE, 1991. http://dx.doi.org/10.1117/12.46363.

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Barachevsky, Valery A. "Photochromic organic compounds with polyfunctional properties." In ICONO '98: Laser Spectroscopy and Optical Diagnostics--Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, edited by Andrey Y. Chikishev, Victor N. Zadkov, and Alexei M. Zheltikov. SPIE, 1999. http://dx.doi.org/10.1117/12.340018.

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Jeffries III, Alfred T., David J. Brzozowy, Ahmad A. Naiini, and Paula M. Gallagher-Wetmore. "Novel combination of photoactive species: photoresists formed from selectively esterified novolacs and polyfunctional photoactive compounds." In Microlithography '97, edited by Regine G. Tarascon-Auriol. SPIE, 1997. http://dx.doi.org/10.1117/12.275876.

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Reports on the topic "Polyfunctional compound"

Brel, Valery K. Development of the New Approaches in Designing of Fluoroorganic Derivatives Sulfur (Unsaturated, Heterocyclic, Aromatic Molecular Systems and Polyfunctional Organic Compounds). Fort Belvoir, VA: Defense Technical Information Center, November 2005. http://dx.doi.org/10.21236/ada447113.

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