Dissertations / Theses on the topic 'Esters'
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Hamilton, Caroline. "Investigations of macrocyclic esters and ether-esters." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298341.
Full textSaid, M. S. "Hydrolysis mechanisms for iminosulphonate esters and fluorene esters." Thesis, University of Essex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353160.
Full textNagatomi, Eiji. "Autoxidation of neopentyl esters used as models for synthetic ester lubricants." Thesis, University of York, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482785.
Full textArca, Hale Cigdem. "Cellulose Esters and Cellulose Ether Esters for Oral Drug Delivery Systems." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/82920.
Full textPh. D.
Deshpande, S. D. "Borate esters promoted epoxidation." Thesis(M.Sc.), CSIR-National Chemical Laboratory, Pune, 1989. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2284.
Full textWitt, Fiona Joy. "Synthetic approaches towards phorbol esters." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276852.
Full textBelogi, Gianluca. "Boronate esters in oligosaccharide synthesis." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367628.
Full textMarriott, Robert Edward. "Accelerated cleavage of phosphate esters." Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272476.
Full textZheng, Xueyan. "Regioselective Synthesis of Cellulose Esters." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/49540.
Full textPh. D.
Gao, Chengzhe. "Regioselective chlorination of cellulose esters." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/96548.
Full textMS
Steele, Heather L. "Permeation Sampling of Phthalate Esters." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1242748589.
Full textBalaguer, Amanda Marie. "Routes to Acylated Sydnone Esters." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1316529382.
Full textSchaff, Jilla. "Fluorinated esters : synthesis and identification." PDXScholar, 1988. https://pdxscholar.library.pdx.edu/open_access_etds/3921.
Full textGiner, Gil Marta. "Role of allyl esters in pest control." Doctoral thesis, Universitat de Lleida, 2012. http://hdl.handle.net/10803/94147.
Full textLa acción insecticida de varios esteres de alilo fue testada en diversos insectos y mediante distintos modos de aplicación. La actividad por aplicación tópica varió en función del éster de alilo. El cinamato de alilo y el naftoato de alilo fueros los compuestos más activos en huevos y larvas neonatas de C. pomonella, G. molesta y L. botrana, mientras que el salicilato de alilo no produjo mortalidad a la dosis más alta testada (10 mg/mL). El cinamato de alilo fue el único éster activo por aplicación tópica en A. pisum mientras que todos los esteres testados lo fueron para T. castaneum. Los esteres de alilo estudiados produjeron pérdida de viabilidad celular en todas las líneas celulares de insectos cuando dicha viabilidad fue analizada mediante dos metodologías distintas (MTT y Azul de Tripano), y siendo ésta debida a la disrupción de la membrana celular. El cinamato de alilo fue el producto más activo, y las células del aparato digestivo de Choristoneura fumiferana (Lepidoptera) las más sensibles. La acción insecticida por ingestión en larvas de S. littoralis y C. pomonella, y en ninfas de A. pisum, fue confirmada y el aparato digestivo fue señalado como principal punto de acción de los esteres de alilo. Los correspondientes ácidos y dicloropropilesteres presentaron una menor o igual acción insecticida que los esteres de alilo siendo dicha acción también debida a un efecto en la membrana celular. Las diferencias en la acción de los distintos compuestos podrían ser debidas a diferencias en las propiedades lipofílicas de los compuestos y su interacción con las membranas celulares. Los esteres de alilo produjeron un efecto en la comunicación química de T. castaneum pero no en A. pisum, lo que podría utilizarse para mantener los productos almacenados libres de T. castaneum. En cuanto a C. pomonella y L. botrana, todos los esteres de alilo probados produjeron una respuesta en las antenas de los machos de C. pomonella, mientras que tan solo el cinamato de alilo la produjo en las antenas de hembras de C. pomonella y en machos y hembras de L. botrana. Esta respuesta no se tradujo en un aumento de la atracción de machos hacia cebos con mezclas de ester de alilo y feromona en ensayos de túnel de viento, pero si aumentó el número de hembras atraídas. Este hecho podría utilizarse par incrementar el número de hembras capturadas en trampas de feromona. Estos resultados, sugieren el papel de los esteres de alilo en el control de plagas, especialmente del cinamato de alilo.
Arnosti, André. "Ação dos ésteres do ácido ricinoléico do óleo de mamona nas glândulas salivares e nos ovários de carrapatos Rhipicephalus sanguineus (Latreille, 1806) (Acari : Ixodidae). Análise histológica /." Rio Claro : [s.n.], 2011. http://hdl.handle.net/11449/87703.
Full textBanca: Gislaine Cristina Roma
Banca: Gilberto Orivaldo Chierice
Banca: Roberta Cornelio Ferreira Nocelli
Banca: Gervasio Henrique Bechara
Resumo: O presente trabalho traz informações que mostram a interferência dos ésteres do ácido ricinoléico extraídos do óleo de mamona (Ricinus communis), no ciclo secretor das glândulas salivares e na vitelogênese de fêmeas do carrapato Rhipicephalus sanguineus, agindo diretamente nos processos de alimentação e de reprodução, respectivamente. Para a realização deste estudo, coelhos hospedeiros infestados com carrapatos, foram alimentados com ração comercial comum (controle-GC) e com ração enriquecida com os ésteres em diferentes concentrações (tratamento- GT). As glândulas salivares sofreram danos, e tiveram o citoplasma das células acinares alterado, trazendo prejuízos ao seu funcionamento, além desta substância ter acelerado a degeneração do órgão como um todo. Os ésteres interferiram na atividade de secreção celular alterando a composição da glicoproteína salivar, especialmente nas células glandulares dos ácinos II. O efeito dos ésteres na vitelogênese foi observado nos ovócitos dos carrapatos do grupo tratamento (GT), os quais apresentaram células germinativas com alterações citoplasmáticas, inibição do desenvolvimento dos ovócitos I e II para os estágios avançados (IV e V), além da interferência na maturação dos ovócitos V. Além disso, nas ampolas dos ovários dos indivíduos tratados, espermatozóides não foram observados no seu interior confirmando a ação dos ésteres no processo de reprodução. Ficou demonstrado também que os danos causados pelos ésteres nas células das glândulas salivares e dos ovários desses ectoparasitas, aumentaram na mesma proporção que houve aumento das concentrações do produto, provocando intensa degeneração dos órgãos
Abstract: The present study brings information which shows the interference of ricinoleic acid esters extracted from castor oil (Ricinus communis) on the secretory cycle of Rhipicephalus sanguineus female ticks' salivary glands and vitellogenesis, acting directly on the feeding and reproduction processes respectively. To perform this study, host rabbits were infested with ticks, fed with regular commercial rabbit food (control-CG) and with food enriched with ester in different concentrations (treatment- TG). The salivary glands were damaged and had the cytoplasm of acinar cells altered, impairing their functioning, and the toxic substance also accelerated the degeneration of the organ as a whole. The esters interfered in the cellular secretion activity altering the composition of salivary glycoproteins, especially in the glandular cells of acini II. The effect of the esters in the vitellogenesis was observed in the oocytes of ticks belonging to the treatment group (TG), whose germinative cells presented cytoplasmic alterations, inhibition of the development of oocytes I and II for advanced stages (IV and V) and interference in the maturation of oocytes V. In addition, spermatozoa were not observed in the interior of the ovaries ampoules, confirming the acaricidal potential of the esters. It was also demonstrated that the damages caused by esters in the salivary glands cells and ovary cells of these ectoparasites increased in the same proportion of the increase in the concentrations of the toxic product, causing intense degeneration of the organs
Mestre
Alezra, Valérie. "Nouvelles voies d'accés à des sérines alpha-substituées énantiopures à partir d'aziridino-esters ou d'oxazolidino-esters." Paris 5, 2000. http://www.theses.fr/2000PA05P614.
Full textMudholkar, Seema. "Effect of oleic acid esters on the microencapsulation of 5-fluorouracil by poly(ortho esters) polymer." Scholarly Commons, 1998. https://scholarlycommons.pacific.edu/uop_etds/2345.
Full textMohammadi, Farahnaz. "Total synthesis of lavendamycin esters and analogs." Virtual Press, 1993. http://liblink.bsu.edu/uhtbin/catkey/865964.
Full textDepartment of Chemistry
Helm, Matthew D. "Heteroaromatic Boronic Esters Through Alkynylboronate Cycloaddition." Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485124.
Full textPainter, Susan Elizabeth. "Anaerobic biodegradation of phthalic acid esters." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25185.
Full textSmyth, G. Darren. "Asymmetric synthesis via #beta#-amino esters." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297678.
Full textMujtaba, Nadeam. "Homochiral heterocycles from β-amino esters." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418480.
Full textDrayton, Sally Katherine. "Palladium-catalysed cyclisation of allylic esters." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358604.
Full textStrickland, Gary. "Epoxide polymerisations initiated by metaborate esters." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263661.
Full textCoulbeck, Eliot. "Parallel kinetic resolutions using active esters." Thesis, University of Hull, 2009. http://hydra.hull.ac.uk/resources/hull:2401.
Full textPullen, Roger. "Poly(itaconate) esters as marine antifoulants." Thesis, Southampton Solent University, 1998. http://ssudl.solent.ac.uk/2436/.
Full textBurns, Christine Elizabeth. "Heterogeneously catalysed preparation of ketophosphonate esters." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326407.
Full textSaket, M. M. "Percutaneous absorption of some steroid esters." Thesis, Cardiff University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372583.
Full textKhan, Ghulam Ahmed. "Enzymatic synthesis of L-DOPA esters." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333598.
Full textBryant, Jonatham James Lloyd. "Investigations of commercial cyclic aromatic esters." Thesis, University of York, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387552.
Full textAnhoury, Roland. "Les esters en thérapeutique médicamenteuse humaine." Paris 5, 1995. http://www.theses.fr/1995PA05P239.
Full textBouillon, Camille. "Synthèse de dendrimères poly(amino)esters." Aix-Marseille 2, 2009. http://theses.univ-amu.fr.lama.univ-amu.fr/2009AIX22073.pdf.
Full textDendrimères represents a new class of organic compounds used in several domains of application such as the medicine, in particular, thanks to their perfectly ordered, defined and hypertrendy spherical architecture. On the basis of our recent and very promising results with PAMAM dendrimers for the transfer of siARN and of DNA, and to improve the efficiency and the biocompatibility of these non viral vectors, we have developed biodegradable dendrimers “susceptible” to be degraded in vivo by enzymatic hydrolysis or by variation of pH. For the synthesis of this new family of poly(amino)ester dendrimers, we envisaged two strategies of syntheses: the one basing on the growth of the dendrimer via the amine formation by Michaël addition, and the other one basing on the construction of the dendrimer via the ester formation by the reaction between an acid and an alcohol. Finally we developed an original and efficient method according to three step sequence to prepare our poly(amino)ester dendrimer using an activation of the carboxylic functions, then a transesterification with the adequate alcohol followed by a scavenging of the excess of alcohol. So we obtained dendrimers of small generation having 12 tert-butyl esters, acid functions or amines in surface
Colin, Sylvie. "Nouveaux accès aux esters α-aminoboroniques." Rouen, 1999. http://www.theses.fr/1999ROUES026.
Full textKirkham, James. "Alkynylboronate cycloadditions towards aromatic boronic esters." Thesis, University of Sheffield, 2011. http://etheses.whiterose.ac.uk/2107/.
Full textBen, Halima Taoufik. "Engaging Esters as Cross-Coupling Electrophiles." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39493.
Full textRigo, Davide <1994>. "Synthesis and applications of isopropenyl esters." Master's Degree Thesis, Università Ca' Foscari Venezia, 2018. http://hdl.handle.net/10579/13861.
Full textHARRATA, ABDELKAMEL. "Reactivite en phase gazeuse de cations radicaux : ceto-esters et dioxolannes-esters et de cations acylium substitues." Paris 6, 1989. http://www.theses.fr/1989PA066708.
Full textRamiandrasoa, Guy. "Etude de l'accès sélectif aux esters 2,3-difonctionnels." Rouen, 1993. http://www.theses.fr/1993ROUES017.
Full textParacatu, Luana Chiquetto [UNESP]. "Ácido cafeico e seus ésteres: inibição do burst oxidativo de neutrófilos e efeito anti-Helicobacter pylori." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/93126.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Universidade Estadual Paulista (UNESP)
A ação patogênica do Helicobacter pylori envolve a colonização do trato gastrointestinal e a produção de EROs por neutrófilos atraídos e ativados pelo agente da infecção. A reação mediada pelos PMN é, todavia, ineficaz para eliminar o H. pylori e as EROs contribuem para a lesão tecidual e desenvolvimento de gastrites e úlcera péptica. O ácido cafeico é um dos mais importantes compostos fenólicos, e apresenta diferentes propriedades biológicas, entre elas antioxidante e antimicrobiana. O objetivo deste estudo foi avaliar a atividade antioxidante e anti-H.pylori do ácido cafeico e seus ésteres. Foram avaliados os ésteres: cafelato de metila, cafelato de butila e cafelato de heptila e realizada uma comparação entre as propriedades antioxidantes do ácido cafeico e tais ésteres, por meio de ensaio de quimiluminescência dependente de luminol e lucigenina, ensaio de inibição da produção do ácido hipocloroso e também ensaios morfológicos com e sem a presença de NBT. Os resultados deste estudo mostraram que os ésteres do ácido cafeico apresentaram melhores resultados em comparação com o ácido cafeico para a capacidade antioxidante. O cafelato de heptila apresentou os melhores resultados para a quimiluminescência dependente de luminol e lucigenina induzida por H. pylori e/ou zymozan opsonizado na concentração de 10 µM e 1 µM . O efeito do ácido cafeico e seus ésteres, também foi estudado na inibição da produção de ácido hipocloroso por neutrófilos ativados com PMA. O cafelato de heptila novamente provou ser melhor em capacidade antioxidante, levando a crer que a lipofilicidade deste composto...
The pathogenic action of Helicobacter pylori involves the colonization of the gastrointestinal tract and ROS production by neutrophils attracted and activated by the agent of infection. However, the reaction mediated PMN is ineffective to remove the H. pylori and ROS contribute to tissue damage and development of gastritis and peptic ulcer. Caffeic acid is one of most important phenolic compounds, and has different biological properties including antioxidant and antimicrobial activities. The aim of this study was to evaluate the antioxidant and anti-Helicobacter pylori activity of caffeic acid and esters. Esters evaluated: methyl caffeic acid ester, butyl caffeic acid ester and heptyl caffeic acid ester and a comparison between the antioxidant properties of caffeic acid and these esters through luminol and lucigenin chemiluminescence assay dependent, inhibition of production of hypochlorous acid assay, morphological tests with and without the presence of NBT. The results of this study showed that the esters of caffeic acid had better results in comparison with caffeic acid to their antioxidant capacity. The heptyl caffeic acid ester showed the best results for the luminol and lucigenin dependent chemiluminescence induced by H. pylori and / or opsonized zymozan in the concentrations of 10 µM and 1 µM. The effect of caffeic acid and esters, was also studied in inhibiting of production of hypochlorous acid by neutrophils activated with PMA. The heptyl caffeic acid ester again proved to be better at antioxidant activity, implying that... (Complete abstract click electronic access below)
Rajagopal, Thivisa. "Synthesis of Single Isomer Trisubstituted Olefins from beta-chloro-alpha-iodo-alpha, beta-Unsaturated Esters and Alkynyl Esters." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28552.
Full textNelson, Keegan Gregory. "Enantioselective hydrolysis of 1-arylpropargylic esters by enzymatic kinetic resolution and dynamic kinetic resolution of 1-arylallylic esters." Thesis, University of Missouri - Kansas City, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1538847.
Full textChiral 1-arylprop-2-en-1-ols and 1-arylprop-2-yn-1-ols are useful building blocks for modern pharmaceuticals. Previous work has found that enzyme catalysis is a potential new enantioselective synthetic route to the former. We found that Candida antarctica lipase is also an effective catalyst for kinetic resolution of various substituted 1 arylpropargylic acetates and haloacetates, affording the respective (R) -1 arylproargylic alcohols with high enantioselectivity (99-100% ee). By varying the substituents on both sides of the ester bond, we discovered that the deacylation of lipase is likely the rate-determining step for our catalytic system. A greater challenge is designing a dynamic kinetic resolution (DKR) system for such substrates, which combines a resolving catalyst (lipase) with a racemizing catalyst, and can potentially lead to quantitative conversion of a racemic substrate into an enantiopure product. We studied the efficacy of various transition-metal complexes for substrate racemization and will report our results for In and Cu compounds.
While kinetic resolution has been performed on the 1-arylallylic acetates with excellent yield and enantioselectivity and the DKR regime has been designed, the resulting site-isolation system has required further testing and fine tuning. We have herein investigated the utilization of macroscale site-isolation as well as various factors including solvent, and acyl donor effects in order to optimize conditions of the system.
Cavalli, Fabrizia. "Atmospheric oxidation of selected alcohols and esters." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=962378763.
Full textSafranski, David Lee. "Poly(beta-amino esters) for cardiovascular applications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42825.
Full textVelázquez, Janice M. "Conversion of corn oil to alkyl esters." [Ames, Iowa : Iowa State University], 2007.
Find full textJones, Iwan Gwynedd. "Desymmetrization of meso-anhydrides by proline esters." Thesis, Bangor University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265515.
Full textGarrais, S. "Synthesis of Lipid Structures and Matricaria Esters." Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517311.
Full textMcAteer, Elizabeth Ann. "Formation and oxidation reactions of phosphonate esters." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396073.
Full textHodgson, Anne. "Asymmetric alkylation of substituted beta-keto esters." Thesis, University of Aberdeen, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292828.
Full textStead, Angela Louise. "Reactions of alkoxyl radicals with aliphatic esters." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403865.
Full textHodgson, Anne. "Asymmetric alkylation of substituted p-keto esters." Thesis, University of Bath, 1991. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760613.
Full text