Etudes Sur La Catalyse De La Reaction De Huisgen Et Nouvelles Applications Synthetiques

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Etudes sur la catalyse de la réaction de Huisgen et nouvelles applications synthétiques

Author : Hichem Elamari
Publisher :
ISBN 13 :
Total Pages : 261 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis Etudes sur la catalyse de la réaction de Huisgen et nouvelles applications synthétiques by : Hichem Elamari

Download or read book Etudes sur la catalyse de la réaction de Huisgen et nouvelles applications synthétiques written by Hichem Elamari and published by . This book was released on 2011 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Au cours de ce travail, nous avons effectué une étude méthodologique pour la préparation de banques de triazoles, en utilisant la réaction de la chimie « clic ». Ces études ont démontré que la réaction entre un alcyne vrai activé et un azoture est possible dans les conditions sans solvant et sans catalyseur pour conduire un mélange d’isomères 1,4 et 1,5 avec un rendement moyen de 76%. Nous avons remarqué que l’addition des métaux (SiO2, MgCl2, Al2O3, FeCl3 et CuCl2) permettait d’améliorer les rendements des réactions, et on a observé que la silice est la meilleur catalyseur, alors que la catalyse au cuivre (I) donne une sélectivité complète pour l’isomère 1,4. Ce résultat est bien confirmé par l’étude de la régiosélectivité qui montre que les molécules contenant deux types d’alcynes (activé et non activé) peuvent êtres fonctionnalisés séquentiellement et sélectivement. Nous avons aussi préparé les bis-triazoles en deux étapes : la première sur l’alcyne activé sans catalyseur et la deuxième étape se fait sur l’alcyne non activé par catalyse au cuivre (I), ce qui permet de dire que les alcynes terminaux portant un groupement carbonyle en  de la triple liaison sont beaucoup plus réactifs.Nous avons également pu étendre l’application de la catalyse supportée dans la réaction de Huisgen dans les domaines de la synthèse de dérivés de produits naturels et d’éthers couronne. En utilisant la synthèse classique et en flux continu, nous avons pu préparer des structures originales dérivées de l’acide quinique porteuse de cycles triazoliques. Ces composés seront testés pour leur activité biologique. Nous avons également entrepris la synthèse de dérivés nouveaux d’éthers couronnes azotes afin d’incorporer à ces structures des bras contenant un ou deux noyaux triazoles. L’obtention de ces substances permettra d’ouvrir l’étude de leur propriétes complexantes dans l’avenir

Nouveaux systèmes catalytiques au cuivre pour la cycloaddition de Huisgen

Author : Lydie Harmand
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (836 download)

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Book Synopsis Nouveaux systèmes catalytiques au cuivre pour la cycloaddition de Huisgen by : Lydie Harmand

Download or read book Nouveaux systèmes catalytiques au cuivre pour la cycloaddition de Huisgen written by Lydie Harmand and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de la thèse était le développement de catalyseurs pour la cycloaddition entre alcynes et azotures catalysée par le cuivre(I) (CuAAC), une des réactions les plus importantes de la chimie moderne. Dans un premier temps, nous avons montré que le complexe de cuivre(II) [Cu(C186-tren)]Br2 pouvait être utilisé comme catalyseur pour cette réaction, et ceci sans ajout d'un réducteur sacrificiel externe de type ascorbate de sodium. Des études spectroscopiques (RPE, UV-visible) suggèrent que l'alcyne sert de « réducteur interne ». Dans un deuxième temps, l'utilisation d'un ligand tren portant trois groupements tert-butylbenzène (tBuBz3tren) a permis d'obtenir des complexes supramoléculaires de cuivre(II) solubles dans l'eau par formation de complexes d'inclusion avec des beta-cyclodextrines. Ces complexes se sont avérés être de bons catalyseurs pour la CuAAC, particulièrement en utilisant l'ascorbate de sodium comme réducteur. Nous avons ensuite préparé le complexe de cuivre(II), [Cu(tBuBz3tren)kétoprofénate]kétoprofénate, dont le contre-ion est l'anion kétoprofénate qui possède une fonction benzophénone comme photosensibilisateur. Sous irradiation à 365 nm, ce complexe est réduit très efficacement en cuivre(I) par transfert d'électron photo-induit. Nos études ont montré que le précatalyseur de cuivre(II) peut donc être activé très efficacement par la lumière pour générer une espèce cuivre(I) très réactive pour la cycloaddition de Huisgen. Le contrôle de l'activité catalytique du complexe a été testé dans le méthanol ou le toluène pour la réaction entre différents azotures et alcynes. Les triazoles correspondants ont été isolés avec d'excellents rendements par simple filtration. De plus, une fois la réaction initiée photochimiquement, il est possible de la stopper instantanément en introduisant de l'air dans le milieu réactionnel. Il s'agit du premier exemple de catalyseur photoactivable pour la chimie click.

Chemistry of Penicillin

Author : Hans T. Clarke
Publisher : Princeton University Press
ISBN 13 : 1400874912
Total Pages : 1116 pages
Book Rating : 4.4/5 (8 download)

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Book Synopsis Chemistry of Penicillin by : Hans T. Clarke

Download or read book Chemistry of Penicillin written by Hans T. Clarke and published by Princeton University Press. This book was released on 2015-12-08 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book makes available, for interested scientists to procure, absorb, and evaluate, the vast body of information on the research and results of the work on the chemistry of penicillin done in England and the United States during the war. The National Academy of Sciences arranged for the preparation of this summary, Dr. H. T. Clarke and Dr. J. R. Johnson representing the United States on the editorial board, and Sir Robert Robinson representing Britain. The body of the work was prepared by more than 60 outstanding biochemists and biophysicists, who describe the phases of research to which they contributed the most. The work of 23 academic, medical, industrial, and government laboratories is reported. Originally published in 1949. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.

Nanocellulose

Author : Jin Huang
Publisher : John Wiley & Sons
ISBN 13 : 3527342699
Total Pages : 514 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Nanocellulose by : Jin Huang

Download or read book Nanocellulose written by Jin Huang and published by John Wiley & Sons. This book was released on 2019-08-05 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensively introduces readers to the production, modifications, and applications of nanocellulose This book gives a thorough introduction to the structure, properties, surface modification, theory, mechanism of composites, and functional materials derived from nanocellulose. It also provides in-depth descriptions of plastics, composites, and functional nanomaterials specifically derived from cellulose nanocrystals, cellulose nanofibrils, and bacterial cellulose. It includes the most recent progress in developing a conceptual framework of nanocellulose, as well as its numerous applications in the design and manufacture of nanocomposites and functional nanomaterials. The book also looks at the relationship between structure and properties. Featuring contributions from many noted experts in the field, Nanocellulose: From Fundamentals to Advanced Materials examines the current status of nanocomposites based on nanocelluloses. It covers surface modification of nanocellulose in the nanocomposites development; reinforcing mechanism of cellulose nanocrystals in nanocomposites; and advanced materials based on self-organization of cellulose nanocrystals. The book studies the role of cellulose nanofibrils in nanocomposites, as well as a potential application based on colloidal properties of cellulose nanocrystals. It also offers strategies to explore biomedical applications of nanocellulose. Provides comprehensive knowledge on the topic of nanocellulose, including the preparation, structure, properties, surface modification and strategy Covers new reports on the application of nanocellulose Summarizes three kinds of nanocellulose (cellulose nanocrystals, cellulose nanofibrils, and bacterial cellulose) and their production, modification, and applications Nanocellulose: From Fundamentals to Advanced Materials is a useful resource for specialist researchers of chemistry, materials, and nanotechnology science, as well as for researchers and students of the subject.

Polysaccharide-Based Nanocrystals

Author : Jin Huang
Publisher : John Wiley & Sons
ISBN 13 : 3527336192
Total Pages : 328 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Polysaccharide-Based Nanocrystals by : Jin Huang

Download or read book Polysaccharide-Based Nanocrystals written by Jin Huang and published by John Wiley & Sons. This book was released on 2015-03-09 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polysaccharide nanocrystals, an emerging green nanoingredient (nanomaterial) with high crystallinity obtained by acid hydrolysis of biomass-based polysaccharides, are of scientific and economic significance owing to their abundance, biodegradation potential, and fascinating functional performance. This versatile class of materials can be used in nanocomposites such as rubber or polyester, and in functional materials such as drug carriers, bio-inspired mechanically adaptive materials or membranes, to name but a few. This book encompasses the extraction, structure, properties, surface modification, theory, and mechanism of diverse functional systems derived from polysaccharide nanocrystals. This highly sought-after trendy book is currently the only monograph devoted to the most current knowledge pertaining to this exciting subject area. It is ideal for researchers and stakeholders who wish to broaden and deepen their knowledge in the fast-moving and rapidly expanding R&D field of polymeric materials.

Modern Tools for the Synthesis of Complex Bioactive Molecules

Author : Janine Cossy
Publisher : John Wiley & Sons
ISBN 13 : 9780470616185
Total Pages : 0 pages
Book Rating : 4.6/5 (161 download)

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Book Synopsis Modern Tools for the Synthesis of Complex Bioactive Molecules by : Janine Cossy

Download or read book Modern Tools for the Synthesis of Complex Bioactive Molecules written by Janine Cossy and published by John Wiley & Sons. This book was released on 2012-10-09 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: All the latest tools needed to plan and perform the synthesis of complex bioactive molecules Focusing on organic, organometallic, and bio-oriented processes, this book explores the impact and use of the latest synthetic tools for the synthesis of complex biologically active compounds. Readers will discover step by step how these synthetic tools have provided new, elegant solutions to many synthetic puzzles. Moreover, they will discover innovative methods that make it possible to control the exact connectivity of atoms within a molecule in order to set precise three-dimensional arrangements. Modern Tools for the Synthesis of Complex Bioactive Molecules features sixteen chapters, each one written by one or more leading experts in organic synthesis from around the world. It covers a broad range of topics that enable readers to take advantage of the latest methods for synthesizing complex molecules, including: Modern catalysis, emphasizing key transformations such as C-H functionalizations, cross-couplings, gold-catalyzed reactions, metathesis-based syntheses, and asymmetric organocatalysis Eco-compatible transformations, including rearrangements and domino reactions Tools for the synthesis of carbohydrates and alkaloids New techniques, including the use of fluorous tags and engineered biosynthesis The last two chapters explore target- and diversity-oriented organic synthesis as well as the use of DNA-based asymmetric catalysis, which are all promising tools for the successful synthesis of complex bioactive molecules. Modern Tools for the Synthesis of Complex Bioactive Molecules is ideal for students and researchers who need to plan and perform the synthesis of complex molecules as efficiently as possible. The book's expert advice will help these readers quickly resolve a broad range of problems that can arise in organic syntheses.

Reactions and Syntheses

Author : Lutz F. Tietze
Publisher : John Wiley & Sons
ISBN 13 : 3527338144
Total Pages : 667 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Reactions and Syntheses by : Lutz F. Tietze

Download or read book Reactions and Syntheses written by Lutz F. Tietze and published by John Wiley & Sons. This book was released on 2015-06-22 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of this classic text book has been completely revised, updated, and extended to include chapters on biomimetic amination reactions, Wacker oxidation, and useful domino reactions. The first-class author team with long-standing experience in practical courses on organic chemistry covers a multitude of preparative procedures of reaction types and compound classes indispensable in modern organic synthesis. Throughout, the experiments are accompanied by the theoretical and mechanistic fundamentals, while the clearly structured sub-chapters provide concise background information, retrosynthetic analysis, information on isolation and purification, analytical data as well as current literature citations. Finally, in each case the synthesis is labeled with one of three levels of difficulty. An indispensable manual for students and lecturers in chemistry, organic chemists, as well as lab technicians and chemists in the pharmaceutical and agrochemical industries.

Cellulose Nanoparticles

Author : Vijay Kumar Thakur
Publisher :
ISBN 13 : 9781788017992
Total Pages : 1154 pages
Book Rating : 4.0/5 (179 download)

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Book Synopsis Cellulose Nanoparticles by : Vijay Kumar Thakur

Download or read book Cellulose Nanoparticles written by Vijay Kumar Thakur and published by . This book was released on 2021-07-09 with total page 1154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume set covers Cellulose Nanoparticles: Chemistry and Fundamentals and Cellulose Nanoparticles: Synthesis and Manufacturing. These books form a useful reference work for graduate students and researchers in chemistry, materials science, nanoscience and green nanotechnology.

Bioactive Heterocycles

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (123 download)

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Book Synopsis Bioactive Heterocycles by :

Download or read book Bioactive Heterocycles written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: