Dissertations / Theses on the topic 'Organic green chemistry'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 47 dissertations / theses for your research on the topic 'Organic green chemistry.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Goei, Elisabeth Rukmini. "Using Green Chemistry Experiments to Engage Sophomore Organic Chemistry." Miami University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=miami1280437800.
Full textDahl, Jennifer Ann. "Synthesis of functional nanomaterials within a green chemistry context /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2007. http://hdl.handle.net/1794/6131.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 158-183). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.
Granville, Stephanie L. "Studies of Iron Polyfluorometallacycle Complexes Enroute to the "Green" Catalytic Synthesis of Hydrofluorocarbons." Thesis, University of Ottawa (Canada), 2011. http://hdl.handle.net/10393/28894.
Full textKherde, Yogesh A. "Green Synthesis and Evaluation of Catalytic Activity of Sugar Capped Gold Nanoparticles." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1388.
Full textCook, Teresa L. "Developing Green One-Step Organic Reactions in the High Speed Ball Mill." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397736534.
Full textJain, Shashank. "Establishing Chemical Mechanisms And Estimating Phase State Of Secondary Organic Aerosol From Atmospherically Relevant Organic Precursors." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/622.
Full textDemirci, Sema. "Synthesis Of Heteroaryl Substituted Dihydrofuran And Dihydropyran Derivatives By Green Chemistry Approach." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610966/index.pdf.
Full textcatalyst with just 5% catalyst loading. The absolute configurations of dihydrofuran and dihydropyran derivatives are known, since the chiral center configurations of all substrates are preserved throughout all the applied processes.
Harvey, Rebecca. "The Role of Green Leafy Plants in Atmospheric Chemistry: Volatile Emissions and Secondary Organic Aerosol." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/556.
Full textBorghese, Sophie. "Toward green processes organic synthesis by catalysis with metal-doped solids." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01017796.
Full textShah, Monic. "Antimicrobial Nanoparticles: A Green and Novel Approach for Enhancing Bactericidal Efficacy of Commercial Antibiotics." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1389.
Full textBorghèse, Sophie. "Toward green processes organic synthesis by catalysis with metal-doped solids." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAF008/document.
Full textNowadays, the modern chemical industry has to deal with increasing environmental concerns, including the disposal of waste and its economic impact, or the diminution of important worldwide resources such as transition metals. In this Ph.D. thesis, we aimed to bring improvement in this area by the development of green processes, based on the use of recyclable heterogeneous catalysts. By combining the catalytic properties of several metal cations with the properties of solid catalysts such as polyoxometalates or zeolites, we were able to set up new tools for organic synthesis. Silver-doped polyoxometalates proved to be very efficient catalysts in the rearrangement of alkynyloxiranes to furans. Acetals and spiroketals were synthetized by dihydroalkoxylation of alkynediols under catalysis with silver-zeolites. As a perspective, we highlighted the potential applications of such green procedures in the total synthesis of more complex molecules. The first results suggested that these environmental friendly processes should gain increasing interest in the future
Haley, Rebecca. "Nickel Mediated Reactions in a High-speed Ball Mill." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535635347164016.
Full textPerman, Jason Alexander. "Solid-State Synthesis of Imide Ligands for the Self-Assembly of Metal-Organic Materials." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3747.
Full textFang, Yuanxing. "Development of low dimensional nanostructured materials for green energy harvesting." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/66110/.
Full textRiemer, Daniel. "Transition Metal-Free Catalytic Systems for the Utilization of CO2 to Achieve Valuable Chemicals." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-14D4-5.
Full textEisenhart, Andrew. "Quantum Simulations of Specific Ion Effects in Organic Solvents." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1626356392775228.
Full textWitayakran, Suteera. "Laccase in organic synthesis and its applications." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26665.
Full textCommittee Chair: Ragauskas, Arthur; Committee Member: Bunz, Uwe; Committee Member: Cairney, John; Committee Member: Collard, David; Committee Member: Singh, Preet. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Bunch, Nathan. "Oral Fluid Method Validation for Bowling Green State University." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1586969951770212.
Full textButler, Steven Kyle. "An Introductory Study of Solid Materials for Capture and Catalysis of Waste Stream Chemicals." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6845.
Full textHellman, Oskar. "Synthesis of framework porous sorbents using sustainable precursors." Thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445896.
Full textGumrukcu, Yasemin. "Synthesis Of 2-heteroaryl Substituted Chiral Fused Cyclopenta[c]pyridine Derivatives Via Pauson-khand Reaction." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611176/index.pdf.
Full textGreen Chemistry&rdquo
approach.
Akanksha, Tyagi. "Development of novel hybrid catalysis for carbon-carbon couplings by titanium oxide photocatalyst and metal cocatalyst." Kyoto University, 2018. http://hdl.handle.net/2433/232379.
Full text0048
新制・課程博士
博士(人間・環境学)
甲第21178号
人博第850号
新制||人||203(附属図書館)
29||人博||850(吉田南総合図書館)
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 吉田 寿雄, 教授 内本 喜晴, 教授 田部 勢津久
学位規則第4条第1項該当
Losfeld, Guillaume. "L’association de la phytoextraction et de l’écocatalyse : un nouveau concept de chimie verte, une opportunité pour la remédiation de sites miniers." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20193.
Full textIncreasing pressure on mineral resources has drawn research efforts into innovative supply and recycling. Metal-rich biomass produced in phytoextraction proved an interesting starting-material for Green Chemistry. It allows the production of new catalysts, referred to as ‘ecocatalysts'. They provide the following benefits: access to new molecules, increased yields in chemicals production, increased regio- and chemo-selectivity… This results in potentially high added-value and possible development of a new economic outlet. This new approach to using metal-rich biomass could spur the development of phytoextraction, a technique considered promising for long, yet without credible economic applications. In this regard metallophyte biodiversity hotspots, such as New Caledonia are of particular interest to assess biomass supply. Ambitious and costly ecological restoration of the mining environment in New Caledonia is increasingly questioned. The development of phytoextraction on most degraded areas, e.g. quarries and wastes piles, to produce biomass for Ecocatalysis could provide revenues, while ensuring reclamation. This thesis looks into a possible outlet in New Caledonia, from plants to catalysts and final chemical products
Long, Henry A. III. "Development and Thermodynamic Analysis of an Integrated Mild/Partial Gasification Combined Cycle (IMPGC) Under Green and Brown Field Conditions With and Without Carbon Capture." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2538.
Full textLo, Enlin. "Sustainable Production of Bio-based Succinic Acid from Plant Biomass." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7693.
Full textAquino, Pedro Gregório Vieira. "Síntese de análogos estruturais de aminoguanidinoidrazonas planejadas como protótipos de fármacos anti-hipertensivos e protetores contra infarto do miocárdio e nova metodologia para formação de ligação C-N em meio aquoso." Universidade Federal de Alagoas, 2016. http://www.repositorio.ufal.br/handle/riufal/1863.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
A Hipertensão Arterial Sistêmica (HAS) é uma doença com alta prevalência e baixas taxas de controle, que traz como uma das principais complicações o infarto. No centro da gênese destas doenças encontramos os chamados Produtos Finais de Glicação Avançada (AGEs), cujo primeiro inibidor descrito foi a aminoguanidina. Dentre o arsenal terapêutico disponível para o tratamento da hipertensão estão as guanidinas agonistas de receptores α2‐adrenérgicos de ação central. Tendo em vista a alta prevalência de HAS e taxas de mortalidade associadas às complicações decorrentes da doença, este trabalho propõe a síntese de aminoguanidinoidrazonas (AGHs) com aplicação potencial para o tratamento da HAS e em outro momento, a criação de arcabouços moleculares rígidos para estas AGHs flexíveis que permitam a obtenção de protótipos que, retendo a atividade anti‐hipertensiva, sejam úteis para prevenção dos danos provocados pelas doenças isquêmicas do coração. Foram sintetizadas 20 AGHs carregando diferentes substituintes aromáticos, cujos rendimentos variaram da ordem de 70 a 90%, utilizando metodologia clássica de condensação entre a aminoguanidina e diferentes aldeídos aromáticos, sendo aqui descrita pela primeira vez a atividade anti‐hipertensiva para uma delas, o composto 234, também conhecido por LQM01. Dentre as AGHs sintetizadas, quatro foram selecionadas para servirem como base para a síntese de análogos rígidos, sendo obtidas 25 substâncias diferentes, das classes dos diidroimidazois, tetraidropirimidinas, aminotriazinas, aminopirimidinas e benzotriazepinaminas, com rendimentos variando da ordem de 40 a 90%. Destas 25 substâncias, 13 são inéditas, não havendo relatos na literatura de sua obtenção e/ou atividades farmacológicas Em um segundo momento, o presente trabalho propõe também um estudo de desenvolvimento de metodologia inédita de formação de ligação carbononitrogênio em meio aquoso, catalisada por cobre com o intuito de contribuir para o arsenal de reações disponível atualmente para a arilação de aminas primárias e amidas com uma reação que seja de fácil execução, barata e ambientalmente correta. Foram desenvolvidas duas metodologias inéditas, uma permitindo a arilação de aminas primárias e outra, a arilação de amidas primárias, secundárias e algumas aminas heterocíclicas, ambas utilizando água suplementada com TPGS como solvente e glicose como agente redutor. No modelo de arilação de aminas primárias trazemos aqui 34 exemplos de reações, incluindo diferentes aminas alifáticas e aromáticas e haletos aromáticos e heteroaromáticos, cujos rendimentos variaram da ordem de 50 a 90%. Trazemos também 34 exemplos de reações com o sistema catalítico de arilação de amidas, incluindo reações com amidas aromáticas, alifáticas, uma lactama, haletos de arila e heteroarila e também algumas aminas heterocíclicas, cujos rendimentos variaram da ordem de 60 a 90%. O presente trabalho permitiu duas contribuições importantes, uma no campo da Química Medicinal, com a síntese de inovadores arcabouços moleculares rígidos derivados das AGHs com potencial aplicação em doenças cardiovasculares e outra contribuição no campo da Química Orgânica Sintética, com o desenvolvimento de novas metodologias de formação de ligação C‐N em meio aquoso e com a utilização de aditivos sustentáveis.
Blanc, Claire-Line. "Conception et optimisation d’un procédé innovant pour la purification d’acides organiques issus de biotechnologie." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0008.
Full textThe objective of this study is to evaluate the use of preparative chromatography in the context of the elaboration and optimization of an innovative purification process of organic acids from biotechnology. Lactic and succinic acids were mainly studied. They are produced by fermentation and used in industry as additive, for a long time. They are identified as promising building blocks for green chemistry development, from renewable carbon. In particular, they are monomers for bioplastic industry. Unlike historical utilizations, this new type of application requires much higher purity levels. Those purities are currently obtained by additional purification steps, like liquid-liquid extraction, distillation and/or crystallization. We tried to evaluate if the required specifications may be reached by the implementation of preparative chromatography. For this chromatography was studied in details as unitary operation, in order to better understand separation mechanisms of studied compounds and implementation parameters. Two resin types were mainly used, a strong cationic one and a strong anionic one. Firstly, thermodynamic study of the adsorption of three organic acids in pure solution was performed. It revealed very different performances for both resins: adsorption on strong cationic resin is quite linear, whereas on strong anionic one adsorption is strongly nonlinear and fits with Langmuir model. Elution velocity influence on peak shape and so on dispersion was then studied. Column efficiency decreases linearly with elution velocity, accordingly to Van Deemter model. It was shown that the line slope was identical at lab scale and on a pilot ten times bigger. Then it may be used to predict column efficiency evolution during scale-up. Mixing solutions from synthetic or real origin were studied, to evaluate operational parameter influence on the separation, as load, feed concentration, pH… On the strong anionic resin, a first modeling was developed for experimental results. It highlighted that Langmuir type adsorption mechanism is not able to explain peak shape and position. We supposed that an ion exchange mechanism with the organic acid dissociated part may happen. This exchange may have a significant impact on peak shape and position, even if organic acids are mainly in molecular form, because of a low work pH. 4 Separations established at lab scale were validated at pilot scale in continuous chromatography ISMB. It was demonstrated that the anionic resin allows to reach a higher productivity than the cationic one, with a similar productivity. A complete purification process was tested with succinic acid, using bipolar electrodialysis acidification, reverse osmosis concentration, preparative chromatography separation with a strong anionic resin and nanofiltration discoloration. Product was then crystallized, to be compared to an industrial product. Our crystals were close to waited specifications and relatively better than the industrial ones. An additional ion exchange step could have allows to reach polymer grade. We show that chromatography is useful in an organic acid purification process, in order to reach a very high purity
Flack, Kyle M. "Two approaches to green chemistry in industrially driven processes: aluminum tert-butoxide as a rate enhancing Meerwein-Ponndorf-Verley reduction catalyst applied to the technological transfer from batch to continuous flow and structural modifications of functionalized trialkylsilylamines as energy efficient carbon dioxide capture solvents." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44802.
Full textKännaste, Astrid. "Volatiles of Conifer Seedlings : Compositions and Resistance Markers." Doctoral thesis, KTH, Organisk kemi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4723.
Full textQC 20100818
Hammarberg, Daniel. "Grön kemi och hållbar utveckling : Laborationsdesign för gymnasium och högskola." Thesis, KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), 2043. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140231.
Full textDenna uppsats behandar hållbarhet inom kemi, den så kallade gröna kemin. Med arbetet söker jag förena grön kemi med hållbar utveckling och hitta metoder för att undervisa grön kemi i en laborativ miljö. I undersökningen har jag designat och testat två laborationer med inslag av grön kemi och hållbar utveckling. Jag ville undersöka om undervisningsmodellen leder till en begreppsutveckling hos studenter och elever. Studenterna/eleverna har genom enkäter och intervjuer uttalat sig om dels sina egna kunskaper och dels om undervisningens inslag och dess bidrag till deras begreppsutveckling. I ett laborativt sammanhang bör fördelarna med ett laborativt arbetssätt utnyttjas. Förarbete och efterarbete ger laborationen ett sammanhang. Studenten/eleven förstår begreppen bättre om de får testa sina kunskaper i en diskussion. Lärarens roll i diskussionen bör vara att lyfta diskussionsnivån genom att styra samtalet och på ett konstruktivt sätt bidra till att föra diskussionen framåt när det är nödvändigt.
Konnert, Laure. "Préparation par mécanochimie de dérivés d'acides aminés et d'hydantoïnes." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS279.
Full textThe development of environmentally-friendly chemistry has to go through the search for solutions concerning the use of organic solvents. Such solvents are often toxic and volatile, and create, especially in the case of halogenated solvents, environmental damage. The primary objective of this project is to develop alternatives to the use in synthetic chemistry of toxic and volatile organic solvents. Specifically, the goal is to develop methods of chemical transformations that can greatly reduce the use of solvent or replace them with alternative solvents. The development of these methods by mechanochemistry enabled to achieve this goal. Several methodologies have been developed and applied to the protection of amino acids and the synthesis of bioactive molecules such as hydantoins, including the preparation of pharmaceutical compounds such as phenytoin and ethotoin, two drugs prescribed against epilepsy
Mans, Daniel J. "Exocyclic Stereocontrol via Asymmetric Hydrovinylation in the General Synthesis of Pseudopterogorgia Natural Products Stereoselective X-Y-Mediated Cyclization Studies of an Allene-Ynamide and an Allene-Aldehyde." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1203969383.
Full textIsmaili, Jihane. "Synthèse de nouveaux polymères pour l’élaboration d’un papier semi-conducteur." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0097/document.
Full textThe use of organic semiconductors in electronic devices offers interesting prospects. Indeed, they make it possible to lighten the weight of these devices in addition to greatly reducing the cost of their manufacture. However, one of the main problems associated with these organic semiconductors is their manufacturing process, which requires toxic organic solvents and multiple synthesis steps. In this work, a new environmentally friendly synthesis process has been developed. A single step was necessary for the preparation of the semiconductors, using the polycondensation reaction between a diamine and a dialdehyde.This reaction was carried out at room temperature in ethanol, a green solvent and without the use of catalysts, thus minimizing energy consumption and using a reaction medium from a renewable and low-toxicity source. After their doping, these polymers exhibited conduction properties comparable to those observed for conventional organic semiconductors.The second part of this thesis was devoted to the study of the use of paper as a support for organic electronics devices; hus avoiding the use of generally non-biodegradable and/or non-renewable substrates (plastic or glass). Two strategies have been used to this end. The first consisted of a direct deposit of the semiconducting polymers to the surface of cellulose filaments.The second is based on the creation of a covalent bond between the semiconductors and the Kraft pulp, using the copper-catalyzed Huisgen 1,3-dipolar cycloaddition reaction (CuAAc)
Pichette, drapeau Martin. "Nouvelles méthodes de synthèse pour la formation de liaisons C(aryl)-hétéroatome et C(aryl)-C par réactions de substitution nucléophile aromatique et vinylique." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCM0005.
Full textThe primary objective of our doctoral research was centered on the use of aryl halides as electrophiles for nucleophilic aromatic substitution (SNAr). First, we tried to create C(aryl)−heteroatom bonds by reacting heteroatom nucleophiles with aryl halides substituted by electron-withdrawing groups. The results of this study were compared with inconsistencies found in the literature and show that the expected order of reactivity of aryl halides is not always observed. A beneficial effect was observed by adding 2,2,6,6-tetramethylheptane-3,5-dione to the reaction of phenols and aryl halides substituted by electron-donating groups in what is the first method allowing the synthesis of diarylethers without added metal catalysts by this pathway. Second, we developed a general α-arylation reaction of aryl ketones with aryl halides under mild reaction conditions. Use of KOt-Bu, an inorganic base capable of single-electron transfer, and DMF as additive enables the synthesis of α-arylketones in excellent yields. This method was applied to the synthesis of fused heterocycles and (Z) tamoxifen, molecules possessing biological activity. A mechanistic study showed that the carbamoyl anion of DMF is involved in a single-electron transfer reaction with aryl halides as the key step of the mechanism. We next applied this method to the nucleophilic vinylic substitution of β-halogenostyrenes. While literature precedents suggest ionic mechanisms for reactions involving these substrates, we obtained experimental evidence suggesting a radical mechanism. Third, we tried to develop the first protocol enabling the copper-catalyzed synthesis of unsymmetrical biaryls starting from aryl halides and triarylbismuthanes(III). Although many bidentate and tetradentated ligands were tested, further optimization is required in order to develop a general method, as only low yields are obtained. Globally, we have contributed to the determination of the experimental frontier between SNAr and metallic catalysis, to the α-functionnalization of aryl ketones and to the synthesis of biaryls through copper-catalyzed cross-coupling reactions of triarylbismuths
Samorì, Chiara <1982>. "Use of solvents and environmental friendly materials for applications in Green Chemistry." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2840/.
Full textMonesi, Alessandro <1983>. "Sulfanyl Radical Addition to Alkynes: Revisiting an Old Reaction to Enter the Novel Realms of Green Chemistry, Bioconjugation, and Material Chemistry." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4555/.
Full textVam, Albert. "Kinetics of the Hydro-Deoxygenation of Stearic Acid over Palladium on Carbon Catalyst in Fixed-Bed Reactor for the Production of Renewable Diesel." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1373313020.
Full textTadrent, Sarra. "Réduction sélective de composés organiques en conditions subcritiques." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2441.
Full textAromatic amines are widely regarded as promising reaction intermediates for the production of dyes, antioxidants, pharmaceuticals and agricultural chemicals. The most widely used method for the preparation of aromatic amines is catalytic hydrogenation in general. The catalytic hydrogenation processes of nitroaromatic compounds use transition metals, such as (Pt, Ni, Pd, ..), organic solvents and hydrogen source like H2. However, the use of metal catalysts has certain disadvantages such as the high cost, recycling of the system, as well as certain environmental concerns. Organic solvents were also used during these processes, which required high energy consumption for the recovery of aromatic amines. Finally, the use of H2 can also lead to safety risks. In the present work, “green” and safe processes for the reduction of nitroaromatic compounds into aromatic amines in the presence of carbonaceous materials or lignocellulosic biomass under subcritical conditions have been developed. Initially, our interest in this work focused on the direct use of carbon which has the advantages, its low cost and its availability, this gave rise to a new process that is "greener" and safer. The reaction mechanism of the latter was studied using CIRCE software which is thermodynamic software based on the Monte Carlo method. This process was then applied to various aromatic nitro compounds substituted by an organic function in particular for the preparation of 3-aminobenzoic starting from 3-nitrobenzaldehyde. Subsequently carbonaceous materials were replaced by lignocellulosic biomass which is sawdust impregnated with a base in water in the subcritical state. Indeed, water known as a green solvent could involve new "green" processes in critical conditions and generate H2 makes it possible to supply the dihydrogen necessary for the feasibility of the reaction
Villoria, del Álamo Beatriz. "Síntesis de catalizadores sólidos orgánicos e híbridos orgánicos-inorgánicos y su aplicación." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/163789.
Full text[CA] En aquesta tesi doctoral, la investigació s'ha centrat en el desenvolupament de dife-rents processos catalítics heterogenis emprant materials híbrids orgànic-inorgànics porosos (MOFs i sílices funcionalitzades) i materials orgànics aromàtics (PAFs), que s'han estudiat en diverses reaccions orgàniques. Després de la preparació dels MOFs en estudi, s'han caracteritzat les seues propietats estructurals i s'han determinat els seus centres actius en els clústers metàl·lics (zirconi, hafni o ceri). La reactivitat d'aquests MOFs i dels materials híbrids sílice-amines s'ha estudiat tenint en compte els seus cen-tres catalítics; aquestes reaccions s'han optimitzat duent a termini un estudi dels meca-nismes de reacció. Finalment, s'han preparat sòlids homoquirals de tipus PAF que presenten el sistema binaftilo, la reactivitat del qual també ha sigut provada. Més específicament, en el capítol 3 s'ha estudiat l'esterificació d' amides, que per-met convertir-les en èsters, grups funcionals més versàtils. Aquesta transformació s'ha abordat des de la catàlisi heterogènia via *MOFs basats en zirconi, hafni i ceri de les sèries MOF-808, UiO-66 i MOF-801. El catalitzador més eficient per a l'esterificació d'amides ha sigut el MOF-808-Zr. Mitjançant anàlisi TGA i l'adsorció d'una molècula sonda bàsica (CO) estudiada utilitzant espectroscopia FT-IR, s'han determinat els cen-tres àcids de Lewis i Brönsted presents en ells. Dels MOFs preparats en aquest treball, el MOF 808-Zr posseeix una menor connectivitat dels clústers metàl·lics i una major grandària de porus que el UiO-66 i el MOF-801; a més, té el balanç adequat de centres àcids i bàsics de Brönsted i Lewis per a activar els substrats de la reacció. L'abast de l'alcoholisi amb n-butanol s'ha estés a un gran nombre de substrats (amides primàries, secundàries i terciàries; aromàtiques i alifàtiques). La reacció també s'ha estudiat en condicions no solvolítiques amb alcohols més complexos. El catalitzador és estable durant la reacció i pot ser reutilitzat fàcilment. El mecanisme de reacció en l'esterifica-ció de benzamida amb n-butanol catalitzada per MOF-808-Zr s'ha investigat mitja-nçant l'anàlisi cinètica emprant el model de LHHW i l'estudi in situ de les interaccions moleculars per FT-IR. En el capítol 4, s'ha investigat la deuteració per intercanvi isotòpic deuteri/hidrògen catalitzada per amines suportades en sílices comercials emprant D2O com a font de deuteri. Aquest procediment és aplicable a una gran gamma de substrats, com a com-postos carbonílics, sals d'organofosfoni, nitrocompostos i, inclosa, hormones esteroi-dals. L'estabilitat del catalitzador, SiO2-(CH2)3-NH2, es manté fins a 10 usos de reac-ció sense pèrdues significatives de l'activitat. Finalment, en el capítol 5, s'afronta la síntesi i aplicació de PAFs homoquirals on s'ha integrat l'esquelet del BINOL (1,1′-binaftil-2,2′-diol) i del BINBAM (1,1'-binaftil-2,2'-disulfonimida) generant tres nous PAFs actius en catàlisi asimètrica: PAF-3,3'-(S)-BINOL, PAF-6,6'-(R)-BINOL i PAF 3,3'-(S)-BINBAM. En concret, el PAF-6,6'-(R)-BINOL ha demostrat la seua activitat catalítica en la reacció d'alquilació d'aldehids aromàtics amb dietil-zinc i el catalitzador PAF-3,3'-(S)-BINBAM és actiu en la reacció aldólica de Mukaiyama i la reducció del doble enllaç de compostos carbonílics a,b-insaturats.
[EN] In this Doctoral Thesis, the research has been focused on the development of different heterogeneous catalytic processes using hybrid porous organic-inorganic materials (MOFs and functionalized silicas) and organic aromatic materials (PAFs), which have been studied in various organic reactions. After the preparation of the MOFs under study, their structural properties have been characterised and their active centres in the metal clusters (zirconium, hafnium or cerium) have been determined. The reactivity of these MOFs and the hybrid silica-mine materials has been studied considering their catalytic centres; these reactions have been optimised by carrying out a study of the reaction mechanisms. Finally, homochiral PAF-type solids have been prepared with the binafil system, whose reactivity has also been tested. More specifically, the esterification of amides has been studied in Chapter 3. This reaction allows to convert the amides into esters, which are more versatile functional groups. This transformation has been approached from the heterogeneous catalysis via MOFs based on zirconium, hafnium and cerium of the MOF-808, UiO-66 and MOF-801 series. The most efficient catalyst for amide esterification has been MOF-808-Zr. Using TGA analysis and the adsorption of a basic probe molecule (CO) studied using FT-IR spectroscopy, the acid centres of Lewis and Brönsted present in them have been determined. Among the MOFs prepared in this work, MOF 808-Zr has a lower metal cluster connectivity and a larger pore size than UiO-66 and MOF-801; it also has the appropriate balance of acid and basic Brönsted and Lewis centres to activate the reaction substrates. The scope of n-butanol alcoholysis has been extended to a large number of substrates (primary, secondary and tertiary amides; aromatic and aliphatic). The reaction has also been studied in non-solvolitic conditions with more complex alco-hols. The catalyst is stable during the reaction and can be easily reused. The reaction mechanism in the esterification of benzamide with n-butanol catalysed by MOF-808-Zr has been investigated through kinetic analysis using the LHHW model and the in situ study of molecular interactions by FT-IR. In Chapter 4, the deuteration by isotopic deuterium/hydrogen exchange catalysed by commercial silica-supported amines using D2O as a source of deuterium has been investigated. This procedure is applicable to a wide range of substrates, such as carbonylic compounds, organophosphonium salts, nitro compounds and, even, steroid hormones. The stability of the catalyst, SiO2-(CH2)3-NH2, is maintained for up to 10 reaction uses without significant loss of activity. Finally, in Chapter 5, the synthesis and application of homochiral PAFs, in which the structure of BINOL (1,1′-binaftil-2,2′-diol) and BIN-BAM (1,1' binaftil-2,2'-disulfonimide) has been integrated, is discussed. Three new PAFs active in asymmetric catalysis has been generated: PAF-3,3'-(S)-BINOL, PAF-6,6'-(R)-BINOL and PAF 3,3'-(S)-BINBAM. In particular, PAF-6,6'-(R)-BINOL has demonstrated its catalytic activity in the alkylation reaction of aromatic aldehydes with diethyl zinc and the catalyst PAF-3,3'-(S)-BINBAM is active in the Mukaiyama aldolic reaction and the reduction of the double bond of carbonylic a,b-unsaturated compounds.
Villoria Del Álamo, B. (2021). Síntesis de catalizadores sólidos orgánicos e híbridos orgánicos-inorgánicos y su aplicación [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/163789
TESIS
Manna, Alessandro. "Studio ed ottimizzazione del sistema catalitico per una sintesi alternativa di dimetiladipato con carbonati organici." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25446/.
Full textWang, Yun. "Catalyseurs d'oxydation en conditions de chimie verte : métaux non toxiques, eau oxygénée, transformation de la biomasse, recyclage par greffage." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30241.
Full textIn order to develop a chemistry more respectful of the environment, access to sustainable processes is mandatory. More specifically, in the field of oxidation chemistry, use of toxic oxidants has to be banished, use of solvents limited and reusable catalysts developed. In this context, two types of greener approaches have been explored. The first approach concerns removal or replacement of acetic acid, an additive - in association with H2O2, favoring exclusive formation of epoxides with Mn and Fe metal complexes as catalysts. For this objective, two strategies have been explored. The first one consists in introducing fluoroalcohol functions in the second coordination sphere of metal complexes with pyridinophane-based ligand to easily activate H2O2. Those complexes did not enhance the catalytic activity for cyclooctene oxidation reactions in comparison to analogous Mn(II) and Fe(III) complexes with unmodified ligands. However, Ni(II) and Co(II) metal complexes with unmodified ligands display interesting catalytic activity for H2 photoproduction. The second strategy aimed to replace acetic acid. Using silica beads functionalized with COOH pendant arms (SiO2@COOH) as additive and H2O2 as oxidant, catalytic epoxidation reactions catalyzed by Mn(II) and Fe(III) metal complexes with BPMEN ligand displayed significant selectivity towards epoxide. The second approach concerns organic-solvent free (ep)oxidation processes with catalysts based on polyoxometalates (POMs). Catalysts SiO2@PMo and SiO2@PW, respectively obtained by ionic grafting of H3PMo12O40 or H3PW12O40 on silica beads functionalized with NH2 pending functions (SiO2@NH2), have been fully characterized. With low catalyst loading, both catalysts displayed efficient oxidation activity and better selectivity than the free POMs. Moreover, recovered beads gave similar conversion and selectivity after two recycling processes
Roumpou, Maria. "The analysis and interpretation of organic residues associated with late bronze age storage vessels from the Toumba, Thessalonikis : an attempt to unravel issues related to storage in the Greek Late Bronze Age, exploiting the potential of analytical chemistry and spectrometry techniques." Thesis, University of Bradford, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.734290.
Full textAmaral, Alexandra Aparecida do. "Síntese de derivados de 3-Indolil-glicina via reação multicomponente de Aza-Friedel-Crafts e avaliação da atividade fitotóxica." Universidade Estadual do Oeste do Paraná, 2018. http://tede.unioeste.br/handle/tede/4017.
Full textMade available in DSpace on 2018-11-13T19:40:33Z (GMT). No. of bitstreams: 1 Alexandra_Amaral_2018.pdf: 6685905 bytes, checksum: ec13a764da46630f5757867d952330fd (MD5) Previous issue date: 2018-07-31
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
It is notable that with technological advances and scientific research, organic synthesis has provided the synthesis of several compounds that are essential to meet the needs of mankind. 3-Indolyl-glycine derivatives have been the subject of several studies, since they are precursors of non-proteinogenic amino acids that act as synthetic intermediates of compounds with important biological activity. However, the synthetic routes described in the literature for these compounds present disadvantages, since they use organic solvents, extreme temperatures, non-recoverable catalysts and long reaction periods. Thus, the search for the development of alternative methodologies has attracted great attention in Organic Synthesis in order to reduce environmental impact, reduce process costs and minimize waste formation. In view of this scenario, the proposal of a new methodology for the synthesis of 3-indolyl glycine derivatives, via a multi-component reaction (Aza-Friedel-Crafts) between indoles, ethylglyoxalate and anilines, which follow the principles established by Green Chemistry, are somewhat of great interest to be studied. After a systematic study of the reaction conditions, two synthetic methodologies were established. In the first methodology a catalyst and surfactant was used in the reaction, under ambient temperature, however this condition led to the formation of by-product from the rearrangement of the desired product. In addition, the catalytic system of this synthetic methodology presented potential to be recycled, but its (re) use showed a decrease in yields, and it is not feasible to use this methodology. Thus, another synthetic methodology was proposed, in which only surfactant was used without the use of the catalyst, with heating of 50 ºC. The second methodology was more feasible, since the yields of the products obtained with the variation of the indole substrate were excellent. The synthesized compounds were evaluated for their biological activity. Bioassays of phytotoxic activity on lettuce seeds (Lactuca sativa) were carried out, in which it was verified that these compounds interfere in seed germination and root growth. Compounds 4b, 4j and 4n showed remarkable germination inhibitory activity at the concentration of 25 ppm. In inhibition of growth, compounds 4a, 4l and 4n showed inhibitory activity already at concentrations of 10 ppm. Such compounds were as active as the glyphosate and atrazine herbicides tested. It is emphasized that compound 4n had inhibitory activity both for germination and for growth of the species studied. Thus, the compounds presented in this paper provide an experimental basis for future studies on pesticides based on 3-Indolyl-glycine derivatives, since it has potential applications for herbicidal activity.
É notório que com os avanços tecnológicos e com as pesquisas científicas, a síntese orgânica proporcionou a síntese de diversos compostos que são essenciais para suprir as necessidades da humanidade. Os compostos derivados de 3-Indolil-glicina tem sido alvo de diversos estudos, visto que são precursores de aminoácidos não proteinogênicos que atuam como intermediários sintéticos de compostos com importante atividade biológica. Entretanto, as rotas sintéticas descritas na literatura para estes compostos apresentam desvantagens, visto que as mesmas utilizam solventes orgânicos, temperaturas extremas, catalisadores não recuperáveis e longos períodos de reação. Desse modo, a busca pelo desenvolvimento de metodologias alternativas tem atraído grande atenção na Síntese Orgânica de modo a proporcionar a redução do impacto ambiental, reduzir custos do processo e minimizar a formação de resíduos. Diante desse cenário, a proposta de uma nova metodologia para a síntese de derivados de 3-indolil-glicina, via reação multicomponente (Aza-Friedel-Crafts) entre indóis, etilglioxalato e anilinas, que contemplam os princípios estabelecidos pela Química Verde, são algo de grande interesse a ser estudado. Após um estudo sistemático das condições de reacão, estabeleceram-se duas metodologias sintéticas. Na primeira metodologia foi utilizado um catalisador e surfactante na reação, sob temperatura ambiente, entretanto essa condição levou a formação de subproduto oriundo do rearranjo do produto desejado. Além disso, o sistema catalítico dessa metodologia sintética apresentou potencial de ser reciclado, porém sua (re)utilização demonstrou um decréscimo nos rendimentos, não sendo viável o uso dessa metodologia. Desse modo foi proposta outra metodologia sintética, na qual só foi utilizado surfactante sem o uso do catalisador, com aquecimento de 50 ºC. A segunda metodologia se mostrou mais viável, visto que os rendimentos dos produtos obtidos com a variação do substrato indólico foram excelentes. Os compostos sintetizados foram avaliados quanto à sua atividade biológica. Bioensaios de atividade fitotóxica em sementes de alface (Lactuca sativa) foram realizados, nos quais se verificou que estes compostos interferem na germinação das sementes e no crescimento das radículas. Os compostos 4b, 4j e 4n mostraram notável atividade inibitória de germinação na concentração de 25 ppm. Na inibição do crescimento, os compostos 4a, 4l e 4n apresentaram atividade inibitória já nas concentrações de 10 ppm. Tais compostos foram tão ativos quanto os herbicidas glifosato e atrazina testados. Salienta-se que o composto 4n teve atividade inibitória tanto para a germinação quanto para o crescimento da espécie estudada. Desse modo, os compostos apresentados neste trabalho fornecem uma base experimental para futuros estudos sobre pesticidas à base dos derivados de 3-Indolil-glicina, visto que tem aplicações potenciais para atividade herbicida.
"Metal Organic Interactions at Hydrothermal Conditions: Useful Transformations Through Geomimicry." Master's thesis, 2020. http://hdl.handle.net/2286/R.I.57227.
Full textDissertation/Thesis
Masters Thesis Geological Sciences 2020
Shrinidhi, Annadka. "Organic Transformations in Water : Synthetic and Mechanistic Studies towards Green Methodologies." Thesis, 2013. http://etd.iisc.ernet.in/2005/3391.
Full textKairouz, Vanessa. "Design, synthèse et application en catalyse verte d’un ligand alkyl imidazolium β-cyclodextrine." Thèse, 2014. http://hdl.handle.net/1866/11464.
Full textChemistry keeps evolving in new directions. Research has provided improved methodologies for the design and synthesis of targeted molecules. At the same time, the 21st century is witnessing increasing concern about the environmental impacts of chemical wastes. A new philosophy of chemical research and engineering has emerged, known as «Green chemistry». This concept encourages the design of products, processes and technologies that minimize the use and generation of hazardous substances. Therefore, there is an urge to develop environmentally friendly process to convert molecules into product of interest. In the present thesis, we describe the synthesis, characterization and catalytic properties of a novel alkylimidazolium-modified β-cyclodextrin (-CD). Our strategy was to construct a single amphiphilic bimodal ligand by the combination of a mass transfer unit (-CD), covalently bound to a ligand moiety (alkylimidazolium, an N-heterocyclic carbene (NHC) precursor) for aqueous catalysis. First, we demonstrated that the introduction of a dodecyl chain on the imidazolium moiety attached to the primary face of a native β-CD allows the formation of a highly active micellar self-assembled catalytic system in neat water with remarkable recyclable properties for the Suzuki–Miyaura coupling. In addition, we studied the versatility of this self-assembled bimodal system by performing Heck coupling in neat water.
Fortun, Solène. "Étude de ligands de type biguanide dans le couplage de Suzuki-Miyaura dans l'eau." Thèse, 2018. http://hdl.handle.net/1866/22630.
Full text