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Academic literature on the topic 'Acétalisation'
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Dissertations / Theses on the topic "Acétalisation"
Hamedi, Sangsari Farid. "Acétalisation du glyoxal par des alcools et des polyols : application à l'étude de la réticulation de cellulose." Lyon 1, 1987. http://www.theses.fr/1987LYO10136.
Full textBonnevie, Christian. "Synthèse et étude physico-chimique de nouveaux tensio-actifs glucidiques." Chambéry, 1998. http://www.theses.fr/1998CHAMS036.
Full textThe market for surfactants employed in detergents, cosmetics and personal hygiene products relies on glucosidic surfactants. Of greatest interest are their effectiveness, their softness and their biodegradability. The synthesis of sugar-based surfactant requires the grafting of a lipophilic chain on a sugar substrate. .
Parker, Évelyne. "Réactions de cycloisomérisation catalysées par des complexes d'argent ou de rhodium pour accéder à des dérivés de furoquinoléine, pyranoquinoléine et dibenzofurane." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00864994.
Full textGozlan, Charlotte. "Synthèses éco-compatibles de nouveaux composés amphiphiles biosourcés à base sucre et leurs applications en tant que tensioactifs et antimicrobiens." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10249.
Full textThe research work described in this manuscript is based on the green chemistry concept and within the frame of sustainable development which involve the use of raw materials from renewable resources and the development of eco-compatible process for the preparation of new products for food-processing, domestic or therapeutic applications. In this context, a new access to monosaccharide acetals and ethers (sorbitan and methyl glucoside) has been developed. The synthetic process is divided in two steps with an acetalisation or a transacetalisation as first reaction which allows to synthesize a new class of monosaccharide acetals. Then, a second step of acetal hydrogenolysis with palladium on charcoal and under hydrogen pressure has permitted access to sorbitan and methyl glucoside monoethers. Then, a one-step process and the use of intermediary short alkyl chain acetal as solubilizing agent has permitted to increase the yield and to consider an industrial development. Finally, these new molecules have been evaluated as surfactants, liquid crystals and antimicrobials and some of them have exhibited very attractive properties which could lead to potential applications in these fields
Parker, Évelyne. "Réactions de cycloisomérisation catalysées par des complexes d’argent ou de rhodium pour accéder à des dérivés de furoquinoléine, pyranoquinoléine et dibenzofurane." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10306/document.
Full textAmong a variety of new synthetic transformations, transition-metal-catalyzed reactions are some of the most attractive methodologies for synthesizing heterocyclic compounds. In this context, two different cycloisomerization reactions are studied. We first developed an efficient and versatile access to pyranoquinoline and furoquinoline derivatives, thanks to a tandem silver-catalyzed acetalization /cycloisomerization reaction. The synthesized compounds presented interesting antimalarial activity when tested on a resistant strain of the parasite Plasmodium Falciparum. The antitumoral activity of some furoquinolines was also investigated within a project funded by the French National League Against Cancer. Interestingly, we noticed that the regioselectivity of the cyclization can be controlled depending on the type of silver catalyst used. The observed reaction regioselectivity, including also an interesting nitrogen effect, led us to develop a silver imidazolate polymer as a stable and new silver catalyst. We also described a rhodium-catalyzed benzannulation reaction of silyl-enol-ethers onto alkynes, leading to dibenzofurans derivatives. These heterocycles are well-known for their biological properties and their interest in therapeutic chemistry. Finally, we developed an original methodology for the synthesis of oxindole derivatives
Godard, Anaïs. "Nouveaux procédés verts d'oxydation de l'acide oléique." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0155/document.
Full textIn a context of scarce oil resources and environmental pressures, the chemical industry needs to innovate by developing new production chains aiming the design of bioproducts from biobased raw materials. Unsaturated fatty acids derived from vegetable oils, thus represents renewable resources with a great potential, allowing to diversify petroleum based supplies. Our interest is focused on the oxidative cleavage reaction of unsaturated fatty acids to yield mono-acids and di-acids with shorter and odd hydrocarbon chains, which are not available at a natural state. Such hydrocarbon chains are attractive for industry because they meet specific properties. But, they are currently only produced from fossil resources. Therefore, the objective was to develop an efficient method for oxidative cleavage, less expensive and less polluting than ozonolysis, the only operational industrial process. The selected oxidizing conditions employs hydrogen peroxide as oxidant, together with a phase transfer catalyst, without using an organic solvent. Several phase transfer catalysts Q3{PO4[WO(O2)2]4} were prepared from tungstophosphoric acid, hydrogen peroxide and a quaternary ammonium salt (Q+,Cl-), in order to compare their effectiveness in transferring oxygen to the substrate in the organic phase. An optimization of reaction parameters was carried out with the most performing catalyst. In addition, two protocols have been developed for the in-situ preparation of the catalyst and its recovery after reaction. The method was extended to fatty acids derivatives, in order to obtain other short chain acids, having a wide range of applications. The environmental benefits associated with this new method were evaluated by calculating green indicators. To consider an easier recycling of the catalyst, the oxodiperoxotungstate anion {PO4[WO(O2)2]4}3-, the active species of the catalyst was supported on anion-exchange resins. Two types of macroporous resins were tested: commercial resins (Amberlite IRA 900 and Lewatit K7367) and modified resins (type Merrifield). We showed that the modified resins, lead to the oxidative cleavage of oleic acid with higher yields than commercial ones, despite the presence of solvent. However, the immobilisation of the oxodiperoxtungstate anion on commercial resins allows the one-step synthesis of acetals, compounds of great interest for the synthesis of derivatives with a high added value. Using acetone as both reagent and solvent, we obtained good yields in ketal. Furthermore, the "one-pot" acetalization reaction of oleic acid was extended to other solvents (alcohols) as an opportunity to synthesize a wide range of acetals. The developed process is particularly interesting as it leads to the direct synthesis of ketal or acetals from an unsaturated fatty acid, avoiding the intermediate reaction steps
Goubert, Marlène. "Nouveaux spiroacétals incorporant des hétéroatomes en bêta du carbone spiranique : synthèse et études structurales." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2007. http://tel.archives-ouvertes.fr/tel-00717740.
Full textDelattre, Émilie. "Fonctionnalisation de polymères et applications en cosmétique." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00918532.
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