Dissertations / Theses on the topic 'Gamma-lactones'
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Arasa, Bertomeu Mª Mercè. "Nous termoestables epoxídics modificats amb gamma-lactones i bis-gamma-lactones condensades." Doctoral thesis, Universitat Rovira i Virgili, 2009. http://hdl.handle.net/10803/9033.
Full textThis work focuses on the thermosetting materials area with applications in coatings or encapsulates for microelectronic devices and it seeks to obtain materials with better durability that after their working life, could be degraded and let the recuperation of the electronic material, which means a great advantage for the environment. The strategy followed has been the copolymerization of diglycidylether of bisphenol A (DGEBA) with mono--lactones and condensed bis--lactones using several rare earth triflates and BF3·MEA as cationic initiators and several tertiary amines as anionic iniciators. This strategy lets the introduction of ester linkages, thermal and chemically cleavable and at the same time the reduction of the shrinkage which is produced during the curing process. The incorporation of aliphatic chains, that come from lactones, between cross-linking points increases the flexibility of the polymeric network and decreases the fragility of the material. The improvement of the mechanical properties also was studied adding layered montmorillonites.
Harmange, Jean-Christophe. "Synthèse totale énantiosélective d'acétogénines d'Annonacées (gamma-lactones monotétrahydroguraniques)." Paris 11, 1992. http://www.theses.fr/1992PA114840.
Full textNYZAM, VALERIE. "Carboalkoxyallylation asymetrique appliquee a la synthese d'alpha-methylene gamma-lactones et gamma-lactames." Nantes, 1996. http://www.theses.fr/1996NANT2029.
Full textSardan, Melis. "Chemoenzymatic Synthesis Of Enantiomerically Enriched Gamma And Delta Lactones." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612404/index.pdf.
Full textcatalysts were used. These lactones were used to test their biological activities.
Brown, Rachel Christine, and rcbrown@adam com au. "gamma-Lactones in wine: Synthesis, quantification and sensory studies." Flinders University. School of Chemistry, Physics and Earth Sciences, 2007. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20080226.234630.
Full textLE, DORZE CATHERINE. "Obtention de gamma-lactones ethyleniques a partir d'acides cetoniques." Nice, 1996. http://www.theses.fr/1996NICE4979.
Full textBos, Maxence. "Synthèse de [gamma]-lactones polyfonctionnelles chirales par catalyse énantiosélective." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS017.
Full textThe development of new synthetic pathway leading to enantiopure compounds with significant structural diversity is an ongoing challenge in many fields of chemistry. The efficiency of these processes has to be evaluated, not only in term of quantitative criteria, such as yields and/or optical purities of obtained compounds, but also by analyzing the environmental impact of the different processes involved. In this work, we sought to develop new methodologies for the synthesis of polyfunctional chiral γ-lactones. The 5-hydroxyfuran-2(5H)-one, a bio-based molecule, was used as a platform to the construction of the γ-lactone ring. In the first part of our work, a variety of chiral γ-lactone displaying a great structural diversity were obtained by a one-pot sequential reaction. First, a step of enantioselective organocatalysis allowed the activation for the transfer of boronic acids on the hydroxyfuran-2(5H)-one; then the chiral adduct formed was engaged in a Passerini reaction leading to the construction of the lactone ring. In a second part, our efforts focused then on the development of catalytic asymmetric alkylation reactions leading to the construction of γ-lactones bearing an all-carbon quaternary stereocenter. Asymmetric allylic reactions were carried out with a very good control of the selectivity of the reaction by the use of palladium and iridium complexes catalysts. Theses lactones bearing an [1,5]-diene scaffold were then engaged in a sigmatropic [3,3] reaction opening a path for a new approach to the functionalization of aromatic heterocycles. Finally, the use of organic enantioselective catalysis was envisioned for the creation of all-quaternary stereocenters
Lyng, Eric E. Bottiglieri Teodoro. "Gamma Hydroxybutyrate (GHB) : mechanisms of central nervous system toxicity /." Waco, Tex. : Baylor University, 2006. http://hdl.handle.net/2104/4211.
Full textLamarque, Laurent. "Synthèse de (gamma)-lactones induite par Mn(OAc)3 : étude de la diastéréosélective." Aix-Marseille 2, 1996. http://www.theses.fr/1996AIX22096.
Full textNacro, Kassoum. "Synthèse de gamma, delta-époxy-bêta-hydroxyesters : accès à des lactones et désoxysucres optiquement actifs." Toulouse 3, 1995. http://www.theses.fr/1995TOU30217.
Full textMoustrou, Corinne. "Synthèses de [gamma]-lactones par cyclisation oxydante de [bêta]-diesters sous l'action du triacétate de manganèse." Aix-Marseille 3, 1991. http://www.theses.fr/1991AIX30062.
Full textMartinez, Rojas Enriqueta. "Characterization of enzymes involved in the biosynthesis of R-[gamma]- [R gamma] and R-_63l-lactones in yeast and Rhodococcus erythropolis DMS 44534." Berlin Univ.-Verl. der TU, Univ.-Bibliothek, 2008. http://www.ub.tu-berlin.de/index.php?id=1890#c7398.
Full textPaquet, Véronique. "Mise en évidence de facteurs d'induction de la production des pristinamycines chez Streptomyces pristinaespiralis." Toulouse, INSA, 1990. http://www.theses.fr/1990ISAT0022.
Full textGouault, Nicolas. "Mise au point de nouvelles méthodes de synthèse de lactones et de 4,5-dihydro-3(2h)-pyridazin-3-ones sur support solide : évaluation de leur activité biologique." Rennes 1, 2002. http://www.theses.fr/2002REN1A004.
Full textOlabisi, Ayodele O. Wimalasena Kandatege. "The chemistry of L-ascorbic acid derivatives in the asymmetric synthesis of C2- and C3-substituted aldono-gamma-lactones." Diss., Access through your commercial service, 2005. http://il.proquest.com/products_umi/dissertations/.
Full text"August 2005." Title from PDF title page (viewed on February 6, 2007). Thesis adviser: Kandatege Wimalasena. Includes bibliographic references (leaves 144-163).
Oh, Seongho. "Optimization and extensions of the nucleophile catalyzed aldol-lactonization (NCAL) process for bicyclic beta-lactone synthesis: applications to piperidine, pyrrolidine, and gamma-lactam-fused beta-lactones." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3961.
Full textLiberge, Gwenaëlle. "Synthèse de molécules nouvelles à potentialités thérapeutiques dans le traitement des troubles du métabolisme (diabète, obésité, prise alimentaire) et du cancer." Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-99-100.pdf.
Full textKunzmann, Martin Herbert [Verfasser], Stephan A. [Akademischer Betreuer] Sieber, and Sabine [Akademischer Betreuer] Schneider. "Synthesis of gamma-lactones for activity based protein profiling: Investigation of their protein reactivity and inhibition of bacterial virulence / Martin Herbert Kunzmann. Gutachter: Sabine Schneider ; Stephan A. Sieber. Betreuer: Stephan A. Sieber." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1047185512/34.
Full textWojciechowska, Joanna. "Ru/TiO2-based catalysts for the hydrogenation of levulinic acid using formic acid as internal hydrogen source." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF061/document.
Full textActive and selective Ru catalysts based on TiO2 supports have been developed for the combined hydrogenation of levulinic acid to γ-valerolactone with internal hydrogen supply via in-situ formic acid decomposition. A controlled modification of the TiO2 support by Ca2+ improved the catalytic performance in the one-pot hydrogenation, as a result of enhanced performances in both the formic acid dehydrogenation and the levulinic acid hydrogenation. The improved performances were associated to stronger Ru/support interactions with weaker CO adsorption, as well as to an increased support basicity. The performances were further exalted thanks to a one-step solar light photon-assisted synthesis method used as sustainable alternative to classical wet impregnation. It enabled the uniform dispersion of sub-nanometric metallic Ru particles with narrow distribution and fine size monitoring, and a volcano-type profile centered at 1.5 nm was demonstrated between the nanoparticle size and the activity
Deligny, Michaël. "Les gamma-alcoxyallylboronates alpha-substitués : de nouveaux outils pour la synthèse asymétrique." Rennes 1, 2003. http://www.theses.fr/2003REN10137.
Full textPagot, Yves. "Etude des mécanismes cellulaires et moléculaires de la bêta-oxydation peroxysomale chez les levures. Effets sur la biotransformation du ricinoléate de méthyle en gamma-décalactone." Dijon, 1997. http://www.theses.fr/1997DIJOS002.
Full textTercinier, Pierre. "Etude de la préparation et de la réactivité des 2,3-aziridino-γ-lactones : approche à la synthèse de l’apto, acide ß-amine composant des microsclérodermines C et D." Paris 11, 2007. http://www.theses.fr/2007PA112080.
Full textThe work described in this thesis concems the synthesis and reactiviy of chiral bicyclic compounds, 2,3gamma-Iactones, and their use in the preparation ofpolysubstituted beta-amino acids. The reactivity of 2,3-aziridino-gamma-Iactones with soft carbon nucleophiles such as organocuprates was first studied. Different aziridines were prepared and reacted with various carbon nucleophiles. A methyl group was successfully introduced at the C-2 position but this was accompanied by the formation of many by-products. The 2,3-aziridino-gamma-Iactones were then used to synthesize APTO, a polysubstituted beta-amino acid fragment of microsclerodermines C and D. An enantiospecific synthesis of a cyclic precursor of APTO was developed starting from L-gulose. This strategy is based upon the preparation of the appropriate aziridine-Iactone, followed by regioselective CC2 ring-opening by an acetate and a Heck reaction. This intermediate was successfully opened by various amines, demonstrating its synthetic potential. Lastly, a new process for the preparation of 2,3-aziridino-gamma-Iactones starting from an unsaturated sulfamate was studied. This intramolecular nitrene transfer aziridination was catalyzed by rhodium salts and mediated by iodosylbenzene diacetate. This new methodology allowed the preparation of 2,3-aziridino-gamma-Iactones with a different stereochemistry than those synthesized previously, potentially leading to new beta-amino acids
Brown, Rachel Christine. "Gamma-lactones in wine synthesis, quanitfication and sensory studies /." 2007. http://catalogue.flinders.edu.au/local/adt/public/adt-SFU20080226.234630/index.html.
Full textElford, Timothy Grant. "[Alpha]-exo-alkylidene [gamma]-lactones and [gamma]-lactams via 2-alkoxycarbonyl allylboronates mechanistic studies, diversity-oriented synthesis and target-oriented synthesis /." 2010. http://hdl.handle.net/10048/1021.
Full textTitle from pdf file main screen (viewed on June 25, 2010). In the title, the words alpha and gamma are represented by the Greek letters. A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Chemistry, University of Alberta. Includes bibliographical references.
Olabisi, Ayodele O. "The chemistry of L-ascorbic acid derivatives in the asymmetric synthesis of C2- and C3-substituted aldono-gamma-lactones." Diss., 2005. http://hdl.handle.net/10057/540.
Full text"August 2005."
Thesis (Ph.D.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistry.