Literatura académica sobre el tema "Alcools gras – Synthèse (chimie)"
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Tesis sobre el tema "Alcools gras – Synthèse (chimie)":
Violleau, Frédéric. "Étude d'un procédé de synthèse et de décomposition en dérivés chlorés de chloroformiates, optiquement actifs ou non, en présence de chlorure d'hexaalkylguanidinium". Toulouse, INPT, 2000. http://www.theses.fr/2000INPT018C.
Fernandes, Beiramar Jorge Miguel. "Etude de la promotion des catalyseurs CuZnAl pour la production d’alcools supérieurs à partir du biosyngaz". Electronic Thesis or Diss., Lille 1, 2013. http://www.theses.fr/2013LIL10170.
This PhD thesis addresses design of novel catalysts for conversion of syngas obtained from biomass into alcohols. It is shown that the catalytic performance of copper-zinc catalysts in carbon monoxide hydrogenation is principally affected by dispersion of copper metallic phase. The performance of these catalysts is strongly affected by promotion with different elements. The activity of the promoted catalysts was correlated with the reducibility of copper phase; the ease of copper reduction leads to more active catalysts. In addition, promotion with iron, chromium and manganese significantly modifies the reaction selectivity. A spectacular increase in carbon monoxide hydrogenation rate was observed on iron-containing catalysts and was attributed to the formation of iron carbide species. Increasing iron content in the catalysts led to higher alcohols productivity and was also accompanied by significant activity in water gas-shift reaction. The catalysts exhibited relative stability in the presence of sulphur containing syngas
Najem, Leïla-Isabelle. "De l'épibromohydrine à la synthèse d'éthers glycidyliques à partir d'alcools gras et étherification du glycérol". Toulouse, INPT, 1994. http://www.theses.fr/1994INPT044G.
Coowar, Djalil. "Cellules souches et maladies neurodégénératives : Conception et synthèse d'inducteurs de différenciation cellulaire". Université Louis Pasteur (Strasbourg) (1971-2008), 2003. http://www.theses.fr/2003STR13211.
In a search for inducers of neuronal differentiation to treat neurodegenerative diseases such as Alzheimer's disease or Amyotrophic Lateral Sclerosis, a series of indole fatty alcohols (IFA) were synthesised. These molecules combine a long chain w-alkanol with an antioxidant core. Melatonin being a well-known antioxidant, the indole ring bearing or not methoxy groups on the benzene moiety was chosen. A Wittig reaction between indole-3-carboxaldehydes and long chain phosphorous ylides was the key step in the preparation of these IFAs. These compounds were then investigated for their free radical scavenger property and their effect on the differentiation of neural stem cells-derived neurospheres. The presence of the hydroxyl group was essential to increase the antioxidant potency of IFAs compared to melatonin. Additionally, we showed that 5MIFA18 promotes the differentiation of neural stem cells-derived neurospheres into neurons at a concentration of 10 nM. Our results suggest that this effect is likely to exert on neuronal progenitors rather than on uncommitted precursors, with 5MIFA18 promoting their differentiation. This finding supports the notion that this molecule acts as a neurotrophic factor. Analysis of the expression of the Notch pathway genes in neurospheres treated during differentiation with 5MIFA18 revealed a significant decrease in the transcription of Notch 4 gene receptor. We hence develop a new synthesis for C-5 substituted indole fatty alcohols using a Suzuki reaction
Pop, Laura Ancuta. "Synthèse stéréosélective d'hétéroaryl alcools et alanines". Phd thesis, INSA de Rouen, 2011. http://tel.archives-ouvertes.fr/tel-00940020.
Brochette, Sandrine. "Sonocatalyse en chimie des sucres : effets des ultrasons sur la glucosylation des alcools gras et l'oxydation du saccharose". Lyon 1, 1997. http://www.theses.fr/1997LYO10222.
Bouilleau, Laurent. "Utilisation en synthèse d'organolithiens allyliques alpha et gamma fonctionnels". Poitiers, 1999. http://www.theses.fr/1999POIT2343.
Goma, Doncescu Nathalie. "Synthèse enzymatique de cires en milieux concentrés". Compiègne, 1997. http://www.theses.fr/1997COMP1022.
Wax ester production has been investigated. Transesterification reaction has been realized from methyl ester mix (vegetable oils of rape and sunflower) and stearyl alcohol with Lipozyme. The alcoholysis reaction is controlled in solvent-free medium that is exclusively composed of the reactants and the enzyme. The transesterification is performed by simply mixing the two substrates in a temperature-controlled water bath under stirring. High yields are obtained with a Iow amount of Lipozyme, rate conversion from 80 to 100 % depending on molar ratio in 2 hours at the temperature of 60 °C. The balance between optimal working temperature and the molar ratio of substrates in such a complex medium appears to be 60 °C with a molar ratio I methyl oleate : stearyl alcohol of I 1: 0,5I. Substrate inhibition due to stearyl alcohol has been confirmed by a study of kinetic parameters. More, external diffusional limitations have been showed (reaction medium/surface of enzymatic support). Then, after evaluation, optimization of process has been performed. The validation of results has been verified at a large-scale process. Another enzymatic preparation has been tested. Novozym permits to obtain optimal yield for the equimolar mixing. This advantage directly led to a final product exempted of substrates. More, catalytic efficiency of Novozym (0,213 min-1) is higher than catalytic efficiency of Lipozyme (0,144 min-1). Finally, transesterification reaction has been examined with the elimination of the co-product formed, the methanol in proportion of producing. The two immobilised enzymes have been investigated in covered reactor, cap-opened reactor and under vacuum. More rapid is the methanol elimination, higher is the rate production of stearyl oleate. The use of substrate ratio S 1/Sz=l leads to direct stearyl waxes production exempted from reactive using simple but efficient way
Prakesh, Michaël. "Synthèse stéréocontrôlée de fluorés allyliques via les fluorés propargyliques. Application à la synthèse d'analogues fluorés de lipides". Rennes 1, 2002. http://www.theses.fr/2002REN10140.
Fernandes, Beiramar Jorge Miguel. "Etude de la promotion des catalyseurs CuZnAl pour la production d’alcools supérieurs à partir du biosyngaz". Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10170/document.
This PhD thesis addresses design of novel catalysts for conversion of syngas obtained from biomass into alcohols. It is shown that the catalytic performance of copper-zinc catalysts in carbon monoxide hydrogenation is principally affected by dispersion of copper metallic phase. The performance of these catalysts is strongly affected by promotion with different elements. The activity of the promoted catalysts was correlated with the reducibility of copper phase; the ease of copper reduction leads to more active catalysts. In addition, promotion with iron, chromium and manganese significantly modifies the reaction selectivity. A spectacular increase in carbon monoxide hydrogenation rate was observed on iron-containing catalysts and was attributed to the formation of iron carbide species. Increasing iron content in the catalysts led to higher alcohols productivity and was also accompanied by significant activity in water gas-shift reaction. The catalysts exhibited relative stability in the presence of sulphur containing syngas