Dissertations / Theses on the topic 'Natural products'
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Bringans, Scott D. "Studies on natural product derivatives : HIV therapies incorporating marine natural products." Thesis, University of Canterbury. Chemistry, 2001. http://hdl.handle.net/10092/6699.
Full textAguilar, Aguinaga Rodrigo, Torres Alexander César Enrique Alva, Esquivel Karla Paola Bernedo, Deza Jhoselyn Lucia Nicole Gomez, and Melgarejo Michael Richard Ganoza. "Shampoo Sólido Natural: Pashoo." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/651789.
Full textPashoo is a company that was created thanks to the idea of five students who are studying the tenth cycle at the Universidad Peruana de Ciencias Aplicadas (UPC), which is oriented to the beauty and health care industry through manufacturing and marketing 100% natural bar shampoo based on selected ingredients according to their nutritional values that they provide to the hair. We have shampoos of different scents and for all types of hair such as jojoba oil, coconut, almond, argan and avocado shampoo combined with natural essences that give the client a feeling of relaxation. On the other hand, we have segmented our customers so that our product can solve their problems. For this project, we are looking at women who have problems with hair loss and irritation on the scalp and who are looking for organic and natural products that are aware of the care of the environment. We will distribute our products through fairs and by delivery using social media and our webpage as communication channels where customers can find necessary information about us and our products. In the same way, show the validations of the business model, the development of the business, the financial and marketing plan, as well as the operations that were carried out throughout this project, finally leaving our conclusions and recommendations for the completion of the project of business.
Trabajo de investigación
Woods, Katherine B. "Bioactive natural products." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/26234.
Full textDesjardine, Kelsey Lorne. "Bioactive marine natural products." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31286.
Full textScience, Faculty of
Chemistry, Department of
Graduate
Dagli, Selma. "Studies in natural products." Thesis, University of Glasgow, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392427.
Full textTele, Chhagan Godha. "Studies in natural products." Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU539757.
Full textLaguna, Egea Juan Carlos. "Acción farmacológica a nivel hepático de los derivados polifenólicos de Cynara scolymus L." Doctoral thesis, Universitat de Barcelona, 1986. http://hdl.handle.net/10803/673012.
Full textDorel, Bruscas Ruth. "New annulation strategies: from polycyclic aromatic hydrocarbons to natural products." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/401589.
Full textEsta Tesis Doctoral cubre tres campos de la química orgánica sintética dedicados a la síntesis de nuevos materiales basados en hidrocarburos aromáticos policíclicos (HAPs), el desarrollo de nuevas metodologías sintéticas catalizadas por complejos metálicos, y la síntesis de derivados de productos naturales. El desarrollo de nuevas estrategias para la síntesis de nuevos fragmentos de grafeno con estructuras bien definidas es un campo de gran interés dada su potencial implementación en dispositivos de electrónica molecular. Los fragmentos de grafeno con estructuras circulares resultan particularmente interesantes debido a sus extraordinarias propiedades optoelectrónicas y de autoensamblaje. En este contexto se desarrolló la síntesis un nuevo fragmento circular de grafeno de elevada simetría C54H20, tetrabenzocircumpireno, cuyas propiedades electrónicas fueron examinadas mediante microscopía de efecto túnel (STM). Los acenos están constituidos por anillos de benceno fusionados en línea, y representan otra atractiva clase de HAPs debido a sus propiedades semiconductoras. Sin embargo, su aplicación en dispositivos electrónicos está limitada por su baja solubilidad y su inherente inestabilidad. Una posible solución para salvar estas limitaciones es preparar derivados parcialmente saturados más estables, los cuales pueden usarse como precursores de los sistemas conjugados. Así, se estableció un nuevo método para la preparación de acenos parcialmente saturados, el cual está basado en una ciclación catalizada por oro(I) de 1,7-eninos que derivan de un precursor común. Este método resultó ser general y permitió la preparación de diversos dihidrotetracenos funcionalizados, así como de hidroacenos con hasta nueve anillos linealmente fusionados.
This PhD covers three fields of synthetic organic chemistry devoted to the synthesis of new materials based on polycyclic aromatic hydrocarbons (PAHs), the development of new metal-catalyzed synthetic methodology, and the synthesis of natural product derivatives. The development of new strategies for the precise synthesis of structurally well-defined novel graphene cutouts is a field of great interest due to their potential implementation in molecular electronic devices. Particularly interesting PAHs are disc-shaped fragments of graphene because of their unique optoelectronic and self-assembly properties, which are predicted to be enhanced for expanded systems. In this context, an efficient synthesis of a new discotic highly symmetric C54H20 graphene fragment – tetrabenzocircumpyrene – was developed and the electronic properties of this new graphene fragment were examined by scanning tunneling microscopy (STM). Acenes consist of planar sets of linearly fused benzene rings and represent another appealing class of PAHs due to their semiconducting properties. Nonetheless, their applicability in electronic devices is limited by their poor solubility and their inherent instability. One approach to circumvent these limitations is the preparation of more stable partially saturated derivatives, which can be used as precursors of the conjugated systems. Thus, a selective method for the preparation of partially saturated acenes under mild reaction conditions was developed based on a gold(I)-catalyzed cyclization of suitable 1,7-enynes that were assembled from a common precursor. The method proved to be general and allowed the preparation of functionalized dihydrotetracenes, as well as larger hydroacenes with up to nine linearly fused rings. The outstanding ability of gold(I) complexes to construct complex polycyclic frameworks was also examined in the context of the synthesis of natural products. Thus, the gold(I)-catalyzed alkoxycyclization of cyclopropyl-tethered 1,6-enynes allowed the ready assembly of the [3,5,5,7] tetracyclic skeleton of Echinopines, which opened an entry for the preparation of functionalized derivatives of these natural products.
Azzouz, Mariam. "Enantioselective synthesis of natural products." Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/365571.
Full textThe present thesis deals with the development of methodology for the syntheses of several organic molecules that were selected by their interesting biological properties: the antibiotic AT2433-A1, the glycosidase inhibidor nectrisine and analogs of the anti-viral Cidofovir (Figure 1.1) . Although apparently structurally unrelated, they were envisaged to be synthesized through common high-efficient key steps that involve metal-catalyzed process. Enantioselective Synthesis of nectrisine We explore an enantioselective synthesis of nectrisine based on Pd-catalyzed asymmetric allylic amination, cross-metathesis and dihydroxylation as key steps. Scheme 1 shows the retrosynthesis proposed, where the key synthon is the allylamine 4 which is obtained in high enantiomeric purity by a deracemization process using Pd/DACH as a catalytic system. Cross-metathesis will allow increasing the chain length, and at the same time would provide the aldehyde functionality necessary for formation of the cyclic imine moiety in the final nectrisine. Besides, configuration of double bond resulting from cross-metathesis must be E in order to provide the correct configuration of hydroxyl groups in 2 after the dihydroxylation reaction. The stereoselectivity of this reaction will be controlled by the stereocenter in the molecule, which could be also be enhanced by chiral ligands in a matched double stereodifferentiation process. The asymmetric allylic amination from racemic butadiene monoepoxide using (η3-C3H5)PdCl/DACH-naphtyl system and t-Butyl-benzoyl-imido carboxylate as a N-nucleophile proceeded with excellent yield (98%) and enantioselectivity (97%) to obtain the chiral allylic amine synthon 4. Elongation of the chain of the key chiral allylic imide with ethyl acrylate through cross metathesis using Hoveyda-Grubbs catalyst (5 mol %), proceeded quatitatively to obtain the trans alkene intermediates 3. The installation of the syn diol moiety via dihydroxylation of the alkene proceeded with high yield and good diastereoselectivity with OsO4/TMEDA. Hydrolysis of benzoate group in 2 with LiOH and in situ cyclization led to the lactam. Whose hydroxyl functionalities were fully protected by treatment with TBSCl. Subsequent protection with di-t-butyl dicarbonate (Boc) 2O and Et3N in CH2Cl2 gave desired product in 50% yield. The increased carbonyl electrophilicity resulting from NBoc protection should facilitate the smooth reduction of the lactam, which proceeded by reaction with Super Hydride® at −78°C to give lactol. Enantioselective Synthesis of Cidofovir Analogues In this context, the retrosynthetic proposal is shown in Scheme 2. Cidofovir (HPMPC) analogues could be obtained by double bond reduction of product 7 followed by protecting group cleavage on compound 11. Compound 7 in turn can be synthesized from compound 6 via chain elongation mediated by cross-metathesis reaction. Lastly, chiral synthon 6 could be obtained by a palladium-catalyzed dynamic kinetic asymmetric transformation (DYKAT) from racemic butadiene monoepoxide (5). The asymmetric allylic amination of racemic butadiene monoepoxide with cytosine as N-nucleophile was carried out with (η3-C3H5)PdCl/DACH-naphtyl system to obtain chiral allylic cytosine in 85% yield and 72% ee. The reaction was successfully expanded to other pyrimidine and purine bases, among which adenine afforded chiral allyl adenine in 90% yield and 92% ee. Chain elongation via Ru-cross metathesis of key allylic nucleobases and diethyl allylphosphonate with second generation Grubbs catalyst (5 mol%), produced desired compounds in 92% and 90% yield, respectively. Deprotection of all protecting groups with TMSBr afforded the desired unsaturated acyclic nucleosides 8 and 9 in good yields. Hydrogenation with (H2, /Pd/C) at 3 bar rendered the saturated Cidifovir analogues 10. Approaches to the Enantioselective Synthesis of AT2433-A1 The objective of this work was to explore a new enantioselective method to obtain AT2433-A1 with special focus on the synthesis of the 2, 4-dideoxy-4-amino-xyloside moiety. The retrosynthetic proposal is shown in Scheme 5.6. The aminodeoxysugar (19) could be obtained from 16 by eletrophile-induced cyclization. A key point is the selection of group X, since it must control the regioselectivity of the cyclization to an endo-mode and eventually must behave as a leaving group in a future glycosylation reaction. Amino alcohol 16 could be prepared from allylic amine 13 by dihydroxylation, sulphate formation and elimination. Compound 13 can be synthesized from allyl amine 12 via chain elongation mediated by cross-metathesis reaction. Lastly, chiral allyl amine 12 could be obtained, similarly to the previous chapters, by a palladium-catalyzed dynamic kinetic asymmetric transformation (DYKAT) from the racemic butadiene monoepoxide 5. On the other hand, the intermediate 15 could be also obtained by addition to the Garner aldehyde (18) followed by deprotection of the protecting groups in 17. The asymmetric allylic amination from racemic butadiene monoepoxide using (η3-C3H5)PdCl/DACH-naphtyl system and imide as a nitrogen nucleophile proceeded with good yield (96%) and enantioselectivity (90%). Chain elongation of key chiral allylic amine 12 was carried out by cross metathesis with allyl phenyl sulphide with Hoveyda-Grubbs catalyst (5 mol%) to obtain the corresponding trans alkene 13 in 80% yield. The installation of the diol moiety with OsO4 was unsuccesful, due to the competitive oxidation of sulfur, preventing the completion of the synthesis.
Al-Zereini, Wael. "Natural products from marine bacteria." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982197985.
Full textZheng, Zehua. "Synthesis of bioactive natural products." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59815.
Full textScience, Faculty of
Chemistry, Department of
Graduate
Reddy, Priyanka, and saipriyanka@gmail com. "Studies in Marine Natural Products." RMIT University. Applied Sciencez, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091023.091658.
Full textBrastianos, Harry Charilaos. "Bioactive natural products from nature." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/3960.
Full textPearce, Clive Michael. "Structural studies on natural products." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259614.
Full textHailes, Helen Claire. "The biosynthesis of natural products." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386280.
Full textKirkham, James E. D. "Synthesis of marine natural products." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442593.
Full textPrinsep, Michéle. "Studies in marine natural products." Thesis, University of Canterbury. Chemistry, 1990. http://hdl.handle.net/10092/7256.
Full textStirling, David J. "Studies on marine natural products." Thesis, University of Canterbury. Chemistry, 1996. http://hdl.handle.net/10092/7815.
Full textHart, Joanne B. "Studies on marine natural products." Thesis, University of Canterbury. Chemistry, 1995. http://hdl.handle.net/10092/7850.
Full textBarrow, Colin James. "Studies in marine natural products." Thesis, University of Canterbury. Chemistry, 1988. http://hdl.handle.net/10092/8598.
Full textBuchanan, Malcolm S. "Natural products from the Hepaticae." Thesis, University of Glasgow, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310305.
Full textRayo, Camacho Corona Maria del. "Natural products against protozoal diseases." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301221.
Full textAnderson, Margaret Marie. "Cytotoxic and antimalarial natural products." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320404.
Full textNizami, Shaikh Sirajuddin. "Studies on rutaceous natural products." Thesis, University of Aberdeen, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333766.
Full textMerritt, A. T. "Approaches to clerodane natural products." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47270.
Full textWang, Pu. "Synthetic studies on natural products." Thesis, University of Edinburgh, 1995. http://hdl.handle.net/1842/13199.
Full textHeaviside, Elizabeth Anne. "Analogues of antibacterial natural products." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:6b5bd771-515b-49d0-8ec9-cee115d3aebf.
Full textMadden, Katrina Sophie. "Synthesis of polyene natural products." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12052/.
Full textGuo, Haitao. "Synthesis of heteroaromatic natural products." [Ames, Iowa : Iowa State University], 2009.
Find full textSimpson, Graham Bonar. "The synthesis of natural products." Thesis, Liverpool John Moores University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521739.
Full textSonawane, K. B. "Hplc studies of natural products." Thesis(M.Sc.), CSIR-National Chemical Laboratory, Pune, 1999. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/1940.
Full textGhosh, Rajat Kanti. "Chemical investigation of natural products." Thesis, University of North Bengal, 1988. http://hdl.handle.net/123456789/834.
Full textBertrand, Suzie, and Laure Larcher. "Communication of natural beauty products companies." Thesis, Halmstad University, School of Business and Engineering (SET), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2659.
Full textThroughout this work, this study tries to understand “how organic cosmetics companies advertise through magazines?”
In the first place, the theories about green marketing will be studied and the focus will more specifically be on green marketing communication and the communication on general.
Then, we will analyze qualitatively and quantitatively the organic cosmetics’ communication in fashion and health magazines. We will try to compare the differences in communication between these two magazines’ types.
Afterwards, we link the analysis of advertising with the theory in order to underline if the organic cosmetic companies apply the theory in their communication strategy.
To conclude, we will try to answer the question: “how organic cosmetics companies advertise through magazines?”
Hari, Taylor P. A. "Chemoenzymatic Synthesis of Polyketide Natural Products." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37220.
Full textBayach, Imene. "Non-covalent interactions in natural products." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0050/document.
Full textNatural polyphenols form non-covalent complexes in which π-stacking and H-bonding play a key stabilizing role. The dispersion-corrected DFT calculations have paved the way towards reliable description of aggregation processes of natural products. In this work, these methods are applied at i) understanding of stereo- and regio-selective oligostilbenoids biosynthesis; ii) predicting natural antioxidant aggregation within lipid bilayer membrane, which may allow rationalizing the synergism of vitamin E, vitamin C and polyphenols in their antioxidant action; and iii) modulating optical properties of chalcone derivatives
Li, Guoqiang. "Structure elucidation of bioactive natural products." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0004/NQ29469.pdf.
Full textPfeiffer, Matthew W. B. "Synthetic studies on cyathane natural products." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219217.
Full textMayweg, Alexander V. "Biomimetic synthesis of tropolone natural products." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393410.
Full textThornhill, Andrew John. "Synthetic studies towards marine natural products." Thesis, Bangor University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364987.
Full textHookins, Daniel Ritchie. "Synthesis of oxygenated cyclohexene natural products." Thesis, University of York, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547340.
Full textNicholas, Gillian M. "Studies in New Zealand natural products." Thesis, University of Canterbury. Biochemistry, 1994. http://hdl.handle.net/10092/6092.
Full textHindle, Benjamin D. "Studies in New Zealand natural products." Thesis, University of Canterbury. Chemistry, 1998. http://hdl.handle.net/10092/7073.
Full textJones, Nigel Alan. "Synthesis of carbohydrate-based natural products." Thesis, University of East Anglia, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426420.
Full textGautier, Elisabeth C. L. "Synthetic approaches to epoxyquinol natural products." Thesis, University of East Anglia, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240835.
Full textMalhi, B. S. "Synthetic studies related to natural products." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381529.
Full textPayne, Lloyd James. "Synthetic studies towards selected natural products." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388677.
Full textRowley, David Chapman. "Antiviral natural products from marine sources /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035894.
Full textGraham, Marlowe Saxby. "Synthetic efforts toward quinoid natural products." Thesis, University of Sydney, 2021. https://hdl.handle.net/2123/24543.
Full textChoomuenwai, Vanida. "Antimalarial Natural Products from Terrestrial Macrofungi." Thesis, Griffith University, 2014. http://hdl.handle.net/10072/367345.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Physical Sciences
Science, Environment, Engineering and Technology
Full Text
Stein, Tobias. "Radical synthesis of quinazolinone natural products." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/34389.
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