Academic literature on the topic 'Sulfures – Synthèse (chimie)'
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Journal articles on the topic "Sulfures – Synthèse (chimie)"
Maujean, Alain. "The chemistry of sulphur in musts and wines." OENO One 35, no. 4 (December 31, 2001): 171. http://dx.doi.org/10.20870/oeno-one.2001.35.4.1698.
Full textDissertations / Theses on the topic "Sulfures – Synthèse (chimie)"
Poirier, Romain. "Synthèse en solution de sulfures divisés pour les électrolytes de batteries lithium-ion tout solide." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10212.
Full textSolid electrolytes are now considered to be the key to the development of new generations of batteries. Two types of solid electrolyte have mainly been studied, polymers and inorganics, but their performance remains limited. One promising way of obtaining high-performance electrolytes is to use inorganic particles incorporated into a polymer matrix to form a hybrid electrolyte. Among the possible inorganic materials, the sulfide family (Li3PS4, Li6PS5X with X= Cl, Br, I) has very high ionic conductivities. However, these materials are generally obtained by the solid route, leading to aggregated micrometric particles. Furthermore, although solution syntheses have recently been demonstrated, the potential to control their size, morphology and prevent aggregation has not been exploited. The aim of this thesis is to develop a methodology for the synthesis of sulfides that enables the size, morphology and aggregation of particles to be controlled so that they can be incorporated into a polymer phase. Several solution synthesis routes were developed in order to overcome the kinetic limitations of conventional synthesis. These different synthesis methods have produced a wide range of particles with different morphologies and aggregation rates. The impact of particle size and morphology on the electrochemical performance of the electrolytes was studied. The best performing electrolytes were tested in hybrid formulations as well as in complete all-solid state electrochemical cells with a Li/In anode
Chevrie, David. "Alpha-fluorosulfures et alpha-fluorosulfoxydes, précurseurs appropriés à la synthèse de fluoroalcènes (Z)." Caen, 2001. http://www.theses.fr/2001CAEN2068.
Full textDeschamps, Damien. "[2. 2]Paracyclophanes sulfurés ou phosphorés à chiralité plane : synthèse et dédoublement pour des applications en catalyse organométallique." Caen, 2013. http://www.theses.fr/2013CAEN2016.
Full textThe work of this PhD thesis deals with the synthesis of planar chiral sulfur and phosphorous-based [2. 2]paracyclophanes, and more precisely substrates incorporating the heteroatom in the benzyl position. Various sulfides were obtained, from 4-formyl-[2. 2]paracyclophane and the requisite thiol, by using a reductive sulfanylation reaction. A diastereoselective version was also investigated starting with the analogous acetyl precursor (diastereoisomeric ratios up to 85:15). The phosphorous derivatives were prepared as phosphine borane adducts, with the use of a nucleophilic substitution of the appropriate lithium phosphido-borane with 4-bromomethyl-[2. 2]paracyclophane. Access to the corresponding phosphonium salts and phosphines was then conveniently achieved. Conversion of the S- and P- substituted [2. 2]paracyclophanes prepared, according to a C-H activation approach, was then studied in the presence of palladium(II) acetate. One sulfur palladacycle and three phosphorous derivatives were successfully isolated with yields higher than 58%. Moreover, resolution by semi-preparative HPLC furnished both enantiomers of a phosphapalladacycle with high enantiomeric excesses. Finally, efficient resolution protocols of (±)-[2. 2]paracyclophane-4-thiol and (±)-[2. 2]paracyclophan-4-yl-methanethiol were also described
Corbet, Matthieu. "Applications de la Chimie Radicalaire des Xanthates : Synthèse d'Alcaloïdes d'Origine Marine ; Synthèse de Thiéno[2,3-b]thiopyranones ; Synthèse de Thioéthers Aryliques ; Approche à la Synthèse Totale du (+)-Maritimol." Phd thesis, Ecole Polytechnique X, 2009. http://tel.archives-ouvertes.fr/tel-00432523.
Full textBoursiquot-Michel, Sophie. "Synthèse, caractérisation et réactivité vis-à-vis du chrome (VI) de la mackinawite (FeS)." Nancy 1, 2002. http://docnum.univ-lorraine.fr/public/SCD_T_2002_0236_BOURSIQUOT-MICHEL.pdf.
Full textThis study is about the synthesis, the characterisation of an iron sulphide, mackinawite (FeS) and the reactivity with a metallic pollutant, chromium (VI). First of all, the synthesis of mackinawite was driven from two ways of synthesis currently reported in the literature and which involve the addition of a sulphur (-II) solution to a solution containing iron (0) or iron (II). The characterisation of the physical chemistry properties has shown that the crystallinity of the products obtained from the two ways of synthesis are not equivalent: the product obtained from iron (II) is poorly crystallised whereas the one synthesised from metallic iron is well crystallised and identical to natural mackinawite. The second way of synthesis has then been retained for this study. Otherwise, the alteration of the physical chemistry properties of the surface of mackinawite has been underlined, with the presence of both Fe(II) and Fe(III) bonded to sulphur. At last, the oxidation study has been complex, due to the simultaneous presence of several oxidation products which are greigite, elemental sulphur and iron (oxyhydr)oxides, magnetite and eventually goethite. Elemental sulphur and iron (oxyhydr)oxides are the final products of the reaction, from which a mechanism of mackinawite oxidation has been proposed. The second part of this work concerns the study of the mackinawite/chromium (VI) reactivity and has demonstrated the ability of mackinawite to remove chromium (VI) from solution. The elimination of chromium (VI) results from an oxidoreduction mechanism in solution, chromium (VI) interacting with iron (II) and sulphur species arising from the mackinawite dissolution. The structural analysis of the reaction products reveals the presence of residual mackinawite, greigite, goethite, elemental sulphur and a phase including iron, oxygen and chromium. A reaction mechanism of chromium (VI) reduction by mackinawite has been proposed. It seems that the precipitation of the reaction products is the limiting factor in the chromium (VI) reduction by mackinawite
Jalba, Angela. "Synthèses de nouveaux ligands chiraux de type bipyridine et utilisation de sels de fer dans des réactions d'oxydation énantiosélective de sulfures et des réactions d'insertion de diazocétones dans la liaison S-H et Si-H." Doctoral thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27799.
Full textIn the current context where green chemistry has an important place, we have worked to synthesize several chiral bipyridine-type ligands. We have developed efficient methods for the synthesis of a series of six chiral bipyridine bisoxazoline ligands with C₂ symmetry, where four of them have never been described in the literature before. We have developed an efficient method for the synthesis of chiral ligand precursor analogous of Bolm’s ligand to use in heterogeneous catalysis. Although the synthesis of this ligand is not complete to date, our study has optimized several stages of the synthetic pathway. We have also developed synthetic methodologies based on metals such as iron, copper, and bismuth for being agree to several principles of green chemistry. We have particularly used iron extensively in our research projects because it is abundant, inexpensive, and environmentally benign. We have developed a highly enantioselective catalytic system (up to 98.5:1.5 er) for the oxidation of sulfides leading to good yields of sulfoxides using the non-heme chiral (N₄) FeII catalyst generated in situ (bipybox-i-Pr/FeCl₂). This was made possible when the sulfide mono-oxidation was carried out in tandem with kinetic resolution of the sulfoxide into the sulfone. We have also determined that Bi(OTf)₃∙4H₂O complexed with Bolm’s ligand is a good choice in asymmetric oxidation of sulfides because of reaching the enantiomeric ratios up to 78:22 er in a 65% yield. For the first time, we have reported the α-diazoketones insertion reaction into the Si–H and S–H bonds catalysed by [(CH₃CN)₄Cu]PF₆ and Fe(OTf)₂. We synthesized a wide range of α-silylketones with low to good yields (26–70%) using a low catalytic loading of 0.05 mol % of [(CH₃CN)₄Cu]PF₆. Fe(OTf)₂ has been involved in the insertion reactions of different α-diazoketones into the Si–H and S–H bonds as well. Unfortunately, low yields of α-silylketones were obtained. Moreover, α-thioketones were obtained in poor to very good yields. Now all these methods will be part of the chemists toolbox in green synthetic chemistry and will certainly have an important impact in the field of catalysis.
Girard, Vincent. "Etude des propriétés de regénération par voie oxydante d'oxydes métalliques sulfurés." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00944308.
Full textBourgés, Cédric. "Synthèses, analyses structurales et propriétés thermoélectriques de matériaux sulfures." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC237/document.
Full textThe work presented in this thesis focuses on the synthesis and the structural/physicochemical characterizations of sulfide compounds with thermoelectric properties. Several families of sulphide compounds have been studied with the aim of developing and/or optimizing their thermoelectric performances.A binary compound, TiS2, was synthesized by mechanical alloying followed by a densification using Spark Plasma Sintering (SPS). The structural characterizations have revealed the effect of the elaboration on the microstructure and stoichiometry of the compound. This process induces a considerable reduction in the thermal and electrical conductivity of the material which hindered the optimization of the figure of merit. The ternary compound Cu4Sn7S16 was then developed according to two synthetic routes (conventional and mechanical alloying). It has been demonstrated that this semiconductor compound has a complex structure which promotes an intrinsic low thermal conductivity. The influence of the non-stoichiometry on the thermoelectric properties has been reported. Finally, the CuCoxTi2-xS4 and Cu26V2Sn6S32 compounds were the last interesting results presented. These compounds show metallic transport properties with high power factors. The synthesis and the influence of the Co content on the electronic transport properties have been discussed on the CuCoxTi2-xS4 compound. The effect of mechanical alloying and densification conditions were related to the transport properties of the Cu26V2Sn6S32 compound. Substantial improvement of the thermoelectric performances as reported.These various studies open interesting perspectives for the development and optimization of sulfide compounds for industrial application
Girard, Delphine. "Cystathionine Bêta-Synthase et trisomie 21 : identification, synthèse et évaluation d'inhibiteurs pyridaziniques." Paris 7, 2008. http://www.theses.fr/2008PA077039.
Full textThe additional presence of a copy of chromosome 21 in the genome causes anomalies gathered under the term of Down syndrome (DS) or trisomy 21. Cystathionine Beta-Synthase (CBS), gene of which has been mapped to chromosome 21q22, stays at the crossroads of transmethylation and transsulfuration pathways. In addition, it is responsible for the production of hydrogen sulphide (H₂S), a neurotransmitter gas. An overproduction of H₂S is shown among patients with DS. Therefore, the following assumption was advanced: could the reversible inhibition of CBS overexpession limit the metabolic disorders at the origin of mental retardation of patients with DS? This work aimed at the identification of inhibitors of CBS activity. For that, we set up a test of H₂S-forming activity of CBS which enabled us to validate the effectiveness of some molecules resulting from the screening of more than 7000 molecules. Then our work consisted in synthesizing structural analogs of three hits and evaluating their effectiveness on CBS activity. Unfortunately, among the about sixty tested compounds, none of them showed affinity higher than that of the first molecules found
Mekki, Berrada Mohamed Kamal. "Synthèse d'agglomérats multi-échelles de sulfure de zinc par précipitation homogène." Saint-Etienne, EMSE, 2007. http://tel.archives-ouvertes.fr/tel-00340827.
Full textZinc Sulfide obtained by homogeneous precipitation presents a great importance in the industry of materials with specific optical and electrical properties, which would control its manufacturing process. This product, which is in an agglomerated form, was selected for its structured morphology: each agglomerate presents four scales as for the size of the particles. It is prepared via the thermal decomposition of thioacetamide in an acidic solution containing zinc sulphate. Precipitation is carried out in a stirred batch reactor. The main of this study is to present an original methodology to follow in situ and continuously the concentrations in ions and the characteristics of the formed solid: production and disappearance of the ions sulfide released by the thioacetamide, consumption of the ions zinc, change in supersaturation and morphological characteristics of the ZnS particles. The corresponding sensors are ion-selective sulfide electrode, pH electrode, conductimetric cells and a turbidimetric probe. Other methods of analysis are used too in this experimental study, such as scanning electronic microscopy, X-ray diffractometry and particle sizing by light scattering. The morphology of zinc sulfide particles depends on the operating conditions: stirring rate, initial concentrations in reagents, pH and temperature. The pH is the parameter which leads to the greatest morphological variability. We present the experimental results and interpretation resulting from the homogeneous precipitation of ZnS performed at different pH
Reports on the topic "Sulfures – Synthèse (chimie)"
Cytryn, Eddie, Mark R. Liles, and Omer Frenkel. Mining multidrug-resistant desert soil bacteria for biocontrol activity and biologically-active compounds. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7598174.bard.
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