Bibliographies thématiques / Au-catalyzed

Littérature scientifique sur le sujet « Au-catalyzed »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Au-catalyzed"

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Pung, Swee Yong, Chee Chee Tee, Kwang Leong Choy et Xiang Hui Hou. « Growth Mechanism of Au-Catalyzed Zno Nanowires : VLS or VS-VLS ? » Advanced Materials Research 364 (octobre 2011) : 333–37. http://dx.doi.org/10.4028/www.scientific.net/amr.364.333.

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A systematic study was carried out to study the effect of process parameters on the growth of Au-catalyzed ZnO nanowires (NWs). Growth of Au-catalyzed ZnO NWs could be mainly occurred at the tip or at the base of NWs. This study provided useful information in determining the process window for the tip-growth Au-catalyzed ZnO NWs. Besides, a generic growth mechanism, i.e. a combination of Vapor-Liquid-Solid and Vapor-Solid (VLS and VS) mechanism is proposed to explain the tip-growth and base-growth Au-catalyzed ZnO NWs.
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Rodriguez, Jessica, Nicolas Adet, Nathalie Saffon-Merceron et Didier Bourissou. « Au(i)/Au(iii)-Catalyzed C–N coupling ». Chemical Communications 56, no 1 (2020) : 94–97. http://dx.doi.org/10.1039/c9cc07666b.

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Reeves, Ryan D., Caitlin N. Kinkema, Eleanor M. Landwehr, Logan E. Vine et Jennifer M. Schomaker. « Stereodivergent Metal-Catalyzed Allene Cycloisomerizations ». Synlett 31, no 06 (4 février 2020) : 627–31. http://dx.doi.org/10.1055/s-0037-1610746.

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Metal-catalyzed allene cycloisomerizations provide rapid entry into five-membered carbocyclic frameworks, a common motif in natural products and pharmaceuticals. While both Au(I) and Pd(0)-catalyzed allene cycloisomerizations give 5-endo-dig cyclization, Pd prefers the syn diastereomer in contrast to the anti isomer observed with Au. The change in stereoselectivity is proposed to arise from buildup of A1,3 strain during the key carbopalladation step to furnish the cycloisomerized products in moderate to good dr with yields comparable to Au(I) catalysts.
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Shi, Min, et Qiang Wang. « Synthesis of Cyclic and Heterocyclic Compounds via Gold-Catalyzed Reactions ». Synlett 28, no 17 (27 juillet 2017) : 2230–40. http://dx.doi.org/10.1055/s-0036-1590827.

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This account outlines the latest advances from our group in the field of gold catalysis. A variety of cyclic and heterocyclic compounds, containing different sized skeletons, are synthesized selectively by fine-tuning the substrates, catalysts, and ligands. Au(I)/Au(III) redox catalysis is applied in our latest work through adding external oxidation. The reaction mechanisms are discussed in detail. Moreover, the photoredox catalytic process is also introduced briefly, which opens avenues for the development of new strategies in gold chemistry.1 Introduction2 Gold-Catalyzed Cycloisomerization of Enynes3 Gold-Catalyzed Intramolecular Cyclization of Propargylic Ester Substrates4 Gold-Catalyzed C(sp3)–H Functionalizations5 The Au(I)/Au(III) Redox Catalytic Cycle6 Conclusion
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Лещенко, Е. Д., et В. Г. Дубровский. « Моделирование профиля состава осевой гетероструктуры InSb/GaInSb/InSb в нитевидных нанокристаллах ». Письма в журнал технической физики 48, no 19 (2022) : 20. http://dx.doi.org/10.21883/pjtf.2022.19.53590.19339.

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The formation of the double InSb/GaInSb/InSb heterostructure in self-catalyzed and Au-catalyzed nanowires is studied theoretically. We calculate the compositional profiles across the axial heterostructures and study the influence of different growth parameters on the heterointerface properties, including temperature, Sb and Au concentrations.
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Leshchenko E. D. et Dubrovskii V. G. « Modeling the compositional profiles across axial InSb/GaInSb/InSb nanowire heterostructures ». Technical Physics Letters 48, no 10 (2022) : 17. http://dx.doi.org/10.21883/tpl.2022.10.54790.19339.

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The formation of the double InSb/GaInSb/InSb heterostructure in self-catalyzed and Au-catalyzed nanowires is studied theoretically. We calculate the compositional profiles across the axial heterostructures and study the influence of different growth parameters on the heterointerface properties, including temperature, Sb and Au concentrations. Keywords: III-V nanowires, axial heterostructure, heterointerface, modeling
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Bhunia, Sabyasachi, et Rai-Shung Liu. « Access to molecular complexity via gold- and platinum-catalyzed cascade reactions ». Pure and Applied Chemistry 84, no 8 (31 mars 2012) : 1749–57. http://dx.doi.org/10.1351/pac-con-11-09-13.

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We report recent progress on Au- and Pt-catalyzed cascade reactions to access complicated molecular frameworks. Reported reactions include new cyclization/cycloaddition cascades on carbonyl and epoxide substrates tethered with an allene, alkene, and alkyne. Such substrates enable Au-catalyzed cascade reactions comprising an initial cyclization to form reactive 1,n-dipole that undergoes subsequent cycloadditions with suitable dipolarophiles.
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Dubrovskii, V. G., N. V. Sibirev, Y. Berdnikov, U. P. Gomes, D. Ercolani, V. Zannier et L. Sorba. « Length distributions of Au-catalyzed and In-catalyzed InAs nanowires ». Nanotechnology 27, no 37 (8 août 2016) : 375602. http://dx.doi.org/10.1088/0957-4484/27/37/375602.

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Xu, Shao Hong. « Au-Catalyzed Homocoupling of Terminal Alkynes ». Applied Mechanics and Materials 184-185 (juin 2012) : 900–903. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.900.

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The homocoupling reaction of alkynes was carried out smoothly in the presence of 10 mol% AuCl3 using I2 as oxidant to generate diyned products in high yields. The method is simple, efficient, safe and AuClPh3 also showed comparable catalytic activity to this transformation.
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Aponick, Aaron, Chuan-Ying Li et Berenger Biannic. « Au-Catalyzed Cyclization of Monoallylic Diols ». Organic Letters 10, no 4 (février 2008) : 669–71. http://dx.doi.org/10.1021/ol703002p.

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Thèses sur le sujet "Au-catalyzed"

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Ma, Ruoyu. « Chiral NHC-Au(I) Catalyzed Enantioselective Reactions ». Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1585432603722902.

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Yaguchi, Momo. « The Effect of Lattice Strain in Electrochemical Oxidations Catalyzed by Au-PdPt Core-shell Octahedral Nanoparticles ». Thesis, Boston College, 2012. http://hdl.handle.net/2345/2928.

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Thesis advisor: Chia-kuang Frank Tsung
Pt-based alloy and core-shell nanoparticles have been intensively studied to regulate its size and shape. It has known that these nanoparticles show enhanced catalytic activity in various important fields such as heterogeneous catalysis, and electrochemical energy storage including fuel cells and metal-air batteries. Here, we report a facile hydrothermal synthesis of sub-10 nm PdPt alloy and sub-20 nm Au@PdPt core-shell structures. By using a mild reducing agent in aqueous solution, metal precursors are co-reduced. Specific gases are introduced during the synthesis to optimize the reaction conditions. The PdPt alloy and Au@PdPt core-shell nanostructures were characterized and confirmed by TEM, HRTEM, EDS, ICP-OES and XRD. The resulting PdPt and Au@PdPt particles are monodispersed single crystalline and octahedral shape enclosed by (111) facets. The electrocatalytic activity for the oxidation of formic acid was tested. It was found that the catalytic activity toward the formic acid oxidation of Au@PdPt core-shell particles were much higher than those of PdPt alloy particles. In addition, Pt-rich compositions were the most active in both PdPt alloy and Au@PdPt core-shell nanoparticles. Further studies on thinner alloy-shell core-shell nanoparticles reveal that there is a volcano-curve relationship between the lattice strain strength related to alloy-shell thickness and the catalytic performance. It is proposed that there are three key parameters that can determine the catalytic activity: the alloy composition, the presence of the gold core, and the thickness of alloy-shell
Thesis (MS) — Boston College, 2012
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
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Cera, Gianpiero <1985&gt. « Au(I) Catalyzed Manipulation of Propargylic Alcohols : A New Route Towards the Synthesis of Indole Alkaloids ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6417/1/Cera_Gianpiero_Tesi-1.pdf.

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In this work we presented several aspects regarding the possibility to use readily available propargylic alcohols as acyclic precursors to develop new stereoselective [Au(I)]-catalyzed cascade reactions for the synthesis of highly complex indole architectures. The use of indole-based propargylic alcohols of type 1 in a stereoselective [Au(I)]-catalyzed hydroindolynation/immiun trapping reactive sequence opened access to a new class of tetracyclic indolines, dihydropyranylindolines A and furoindolines B. An enantioselective protocol was futher explored in order to synthesize this molecules with high yields and ee. The suitability of propargylic alcohols in [Au(I)]-catalyzed cascade reactions was deeply investigated by developing cascade reactions in which was possible not only to synthesize the indole core but also to achieve a second functionalization. Aniline based propargylic alcohols 2 were found to be modular acyclic precursors for the synthesis of [1,2-a] azepinoindoles C. In describing this reactivity we additionally reported experimental evidences for an unprecedented NHCAu(I)-vinyl specie which in a chemoselective fashion, led to the annulation step, synthesizing the N1-C2-connected seven membered ring. The chemical flexibility of propargylic alcohols was further explored by changing the nature of the chemical surrounding with different preinstalled N-alkyl moiety in propargylic alcohols of type 3. Particularly, in the case of a primary alcohol, [Au(I)] catalysis was found to be prominent in the synthesis of a new class of [4,3-a]-oxazinoindoles D while the use of an allylic alcohol led to the first example of [Au(I)] catalyzed synthesis and enantioselective functionalization of this class of molecules (D*). With this work we established propargylic alcohols as excellent acyclic precursor to developed new [Au(I)]-catalyzed cascade reaction and providing new catalytic synthetic tools for the stereoselective synthesis of complex indole/indoline architectures.
In questo lavoro di tesi abbiamo presentato diversi aspetti riguardanti la possibilità di utilizzare alcoli propargilici come precursori aciclici nello sviluppo di nuove reazioni a cascata stereoselettive [Au(I)] catalizzate per la sintesi di architetture indoliche altamente funzionalizzate. Alcoli propargilici su base indolica di tipo 1, sono stati utilizzati per sviluppare un processo a cascata per la sintesi di una nuova classe di indoline tetra cicliche, diidropiranilindoline A e furoindoline B. Un protocollo enantioselettivo è stato successivamente studiato per la sintesi di tali strutture con buone rese ed elevati eccessi enantiomerici. Diversi alcoli propargilici sono stati studiati nello sviluppare reazioni a cascata [Au(I)] catalizzate per la sintesi e funzionalizzazione di anelli indolici. Precursori su base anilinica di tipo 2, si sono rivelati essere precursori di eccellenza per la sintesi di [1,2-a]-azepino-indoli di tipo C. Nel descrivere quest’ultima reattività abbiamo riportato evidenze sperimentali di una nuova specie [Au(I)]-carbenica in grado di dirigere la chiusura dell’anello a sette termini in maniera altamente chemoselettiva. La flessibilità chimica degli alcoli propargilici è stata infine studiata cambiata la natura dell’intorno chimico con differenti gruppi N-alchilati in precursori di tipo 3. Utilizzando come catena un alcol primario, la selettività della reazione si è dimostrata completamente rivolta verso la sintesi della classe dei [4,3-a]-ossazino-indoli D, mentre utilizzando alcoli allilici abbiamo riportato il primo esempio di sintesi e funzionalizzazione enantioselettiva [Au(I)]catalizzata, di questa classe di molecole (D*). Concludendo, in questo lavoro abbiamo stabilito gli alcoli propargilici, essere precursori d’eccezione in reazioni a cascata Au(I) catalizzate riportando nuovi strumenti sintetici per la sintesi stereo selettiva di architetture indoliche ed indoliniche estremamente complesse.
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Cera, Gianpiero <1985&gt. « Au(I) Catalyzed Manipulation of Propargylic Alcohols : A New Route Towards the Synthesis of Indole Alkaloids ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6417/.

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In this work we presented several aspects regarding the possibility to use readily available propargylic alcohols as acyclic precursors to develop new stereoselective [Au(I)]-catalyzed cascade reactions for the synthesis of highly complex indole architectures. The use of indole-based propargylic alcohols of type 1 in a stereoselective [Au(I)]-catalyzed hydroindolynation/immiun trapping reactive sequence opened access to a new class of tetracyclic indolines, dihydropyranylindolines A and furoindolines B. An enantioselective protocol was futher explored in order to synthesize this molecules with high yields and ee. The suitability of propargylic alcohols in [Au(I)]-catalyzed cascade reactions was deeply investigated by developing cascade reactions in which was possible not only to synthesize the indole core but also to achieve a second functionalization. Aniline based propargylic alcohols 2 were found to be modular acyclic precursors for the synthesis of [1,2-a] azepinoindoles C. In describing this reactivity we additionally reported experimental evidences for an unprecedented NHCAu(I)-vinyl specie which in a chemoselective fashion, led to the annulation step, synthesizing the N1-C2-connected seven membered ring. The chemical flexibility of propargylic alcohols was further explored by changing the nature of the chemical surrounding with different preinstalled N-alkyl moiety in propargylic alcohols of type 3. Particularly, in the case of a primary alcohol, [Au(I)] catalysis was found to be prominent in the synthesis of a new class of [4,3-a]-oxazinoindoles D while the use of an allylic alcohol led to the first example of [Au(I)] catalyzed synthesis and enantioselective functionalization of this class of molecules (D*). With this work we established propargylic alcohols as excellent acyclic precursor to developed new [Au(I)]-catalyzed cascade reaction and providing new catalytic synthetic tools for the stereoselective synthesis of complex indole/indoline architectures.
In questo lavoro di tesi abbiamo presentato diversi aspetti riguardanti la possibilità di utilizzare alcoli propargilici come precursori aciclici nello sviluppo di nuove reazioni a cascata stereoselettive [Au(I)] catalizzate per la sintesi di architetture indoliche altamente funzionalizzate. Alcoli propargilici su base indolica di tipo 1, sono stati utilizzati per sviluppare un processo a cascata per la sintesi di una nuova classe di indoline tetra cicliche, diidropiranilindoline A e furoindoline B. Un protocollo enantioselettivo è stato successivamente studiato per la sintesi di tali strutture con buone rese ed elevati eccessi enantiomerici. Diversi alcoli propargilici sono stati studiati nello sviluppare reazioni a cascata [Au(I)] catalizzate per la sintesi e funzionalizzazione di anelli indolici. Precursori su base anilinica di tipo 2, si sono rivelati essere precursori di eccellenza per la sintesi di [1,2-a]-azepino-indoli di tipo C. Nel descrivere quest’ultima reattività abbiamo riportato evidenze sperimentali di una nuova specie [Au(I)]-carbenica in grado di dirigere la chiusura dell’anello a sette termini in maniera altamente chemoselettiva. La flessibilità chimica degli alcoli propargilici è stata infine studiata cambiata la natura dell’intorno chimico con differenti gruppi N-alchilati in precursori di tipo 3. Utilizzando come catena un alcol primario, la selettività della reazione si è dimostrata completamente rivolta verso la sintesi della classe dei [4,3-a]-ossazino-indoli D, mentre utilizzando alcoli allilici abbiamo riportato il primo esempio di sintesi e funzionalizzazione enantioselettiva [Au(I)]catalizzata, di questa classe di molecole (D*). Concludendo, in questo lavoro abbiamo stabilito gli alcoli propargilici, essere precursori d’eccezione in reazioni a cascata Au(I) catalizzate riportando nuovi strumenti sintetici per la sintesi stereo selettiva di architetture indoliche ed indoliniche estremamente complesse.
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Charpenay, Mélanie. « Fenestradiènes et cyclooctatriènes : synthèse directe par réaction en cascade palladocatalysée ». Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00836869.

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Ces travaux de thèse nous ont permis de mettre au point différentes voies de synthèse de systèmes polycycliques complexes tels que des fenestradiènes et des cyclooctatriènes, par réactions en cascades palladocatalysées. Celles-ci débutent par une réaction de cyclocarbopalladation 4-exo-dig et est suivie par un couplage de Sonogashira. Dans des conditions adéquates, une réaction d'addition d'alcyne sur une triple liaison a ensuite lieu et [permet] d'accéder à un intermédiaire de type tétraène, dont les quatre doubles liaisons conjuguées permettent au système de subir spontanément une électrocyclisation à huit électrons. Sous contrôle des conditions d'irradiation, une réaction supplémentaire d'élecrocyclisation à six électrons re s'effectue alors. Plusieurs exemples de [4.6.4.6] fenestradiènes, ainsi que des cyclooctatriènes 6-4-8 et 7-4-8 comportant des différents substituants ont ainsi été synthétisés, en partant du même substrat de départ de structure relativement simple et en utilisant des réactifs et catalyseurs courants. Notre étude souligne notamment la remarquable régiosélectivité de la réaction d'addition d'alcyne qui se déroule lors de cette cascade réactionnelle catalysée au palladium.
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Zhang, Man. « Design, synthesis, and evaluation of bioactive molecules ; Chiral polyvinylpyrrolidones supported Cu/Au nanoclusters catalyzed cyclization of 5-substituted nona-1,8-dien-5-ols ». Diss., Kansas State University, 2017. http://hdl.handle.net/2097/35470.

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Doctor of Philosophy
Department of Chemistry
Duy H. Hua
Small molecules are of great importance in drug discovery currently. The first three chapters discussed the design, synthesis and bio-evaluation of three different classes of small molecules and exploration of their biological targets. Triacsin C analogs were designed as long chain fatty acyl-CoA synthetase (ACSL) inhibitors for attenuating ischemia and reperfusion (I/R) injury. Oxadiazole derivatives were designed as T-type calcium channel inhibitors, which have potential application in the treatment of seizure and epilepsy. Tricyclic pyrone derivatives were reported as anti-Alzheimer lead compounds in previous research done by the Hua group. TP70 and CP2 were synthesized to explore their pharmacokinetics properties. Chapter 4 described chiral-substituted poly-N-vinylpyrrolidones (CSPVP) supported Cu/Au nanoclusters mediation of cyclization reaction of 5-substituted nona-1,8-dien-5-ols. A five-member cyclized lactone possessing a stereogenic tetrasubstituted carbon center was formed in a one-step Cu/Au nanoclusters-hydrogen peroxide oxidation reaction. This developed a novel and simple method to synthesize tetrasubstituted carbon stereogenic center. Drawbacks of the method in my initial study were low reaction yield and moderate enantioselectivity. The chemical yield and enantioselectivity have been significantly improved by introducing bulkier substitution in C3 and C4 positions of CSPVP according to the updates of ongoing research.
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Li, Jihui. « Copper-Catalyzed Domino C-N Bond Formation for Synthesis of N-Containing Compounds (Benzimidazoles, Imidazoles, and Guanidines) - Approach toward Total Synthesis of Natural Product Raputindoles ». Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112130.

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Cette thèse est constituée de trois parties : 1) Le contexte bibliographique, 2) le développement de réactions domino cupro-catalysées et 3) une approche vers la synthèse totale des raputindoles.La première partie introduit d’abord le concept de réactions domino ainsi que leurs applications, puis les réactions catalysées par du cuivre permettant de former des liaisons C-N sont passées en revue en incluant les couplages de Ullmann, Goldberg et de Chan-Lam, les séquences d’activation oxydante de liaisons C-H/formation de liaison C-N, l’insertion de nitrènes et l’hydroamination de liaisons C-C multiples. En se basant sur ces réactions élémentaires permettant de former une liaison C-N unique, les développements récents de réactions domino sont ensuite détaillés.La deuxième partie peut être subdivisée en 3 sections : 1) la synthèse de benzimidazoles, 2) la synthèse d’imidazoles and 3) la synthèse de guanidines. Un rappel des méthodes existantes pour la synthèse de ces motifs est proposé dans chaque section. Notre travail, basé sur la formation de liaisons C-N multiples selon une séquence cupro-catalysée domino, est ensuite détaillé. Celui-ci nous a permis d’aboutir au développement de voies d’accès aux benzimidazoles, en utilisant une réaction séquentielle catalysée par du cuivre en présence d’oxygène à partir d’acides boroniques et d’amidines, à la synthèse d’imidazoles par une réaction de di-amination d’alcynes vrai par des amidines et à l’obtention de guanidines et de 2-aminobenzimidines par une réaction à 3 composant. Ces réactions domino montrent une bonne efficacité et permettent d’assembler des hétérocycles à partir de précurseurs aisément accessibles.La dernière partie est consacrée à la synthèse des raputindoles. La structure, les activités et les réactions clé pour la construction de ces alcaloïdes sont discuté d’abord, nous amenant à proposer une rétrosynthèse pour accéder à ces molécules. Les réactions qui ont retenues notre attention pour construire ces molécules sont une annelation [3+2] irido-catalysée d’acides o-formylarylboronique et de 1,3-diènes, la synthèse de Leimgruber-Batcho pour obtenir des indoles et une séquence d’alkylboration-protodéboration. A partir de cela 3 stratégies ont été évaluées, montrant que l’accès à ce type de composé naturel est envisageable en combinant ces étapes
This thesis consists in three parts: bibliographic background, copper-catalyzed reactions for synthesis of N-containing compounds, approach to the synthesis of raputindoles.The first part introduces the domino reactions and their applications, then, copper-mediated reactions for construction of C-N bond formation are reviewed including Ullmann, Goldberg and Chan-Lam coupling, oxidative C-H activation/C-N formation, insertion of nitrenes and carbenoids, and hydroamination of multi-C-C bonds. This can be used as guides to design domino reaction. Following these copper-mediated single C-N bond formation reactions, recent developments of copper-catalyzed domino reactions for synthesis of heterocycles are described.The second part can be divided into three sections: 1) synthesis of benzimidazoles, 2) synthesis of imidazoles and 3) synthesis of guanidines. Each section summarizes the existing methods used for their synthesis. Following it, our synthetic work involving copper-catalyzed C-N bond formation domino reactions is discussed in detail. Our objectives include the synthesis of benzimidazoles through copper-catalyzed sequential reaction of benzamidines and boronic acids, synthesis of imidazoles via copper-catalyzed domino reaction of benzamidines and acetylenes, and synthesis of guanidines and 2-aminobenzimidazoles by Cu-catalyzed three-component reaction of cyanamides, boronic acids and amines. These copper-catalyzed domino reactions show high efficiencies from readily available and simple starting materials.The last part is about the total synthesis of raputindoles. The structure and bioactivities of raputindoles and key reactions for the total synthesis of raputindoles are introduced first, the synthetic strategies are then proposed on basis of relative synthetic methods. The key reactions we use for the synthesis of raputindoles are iridium catalyzed [3+2] annulation of o-formylarylboronic acids and 1,3-dienes, Leimgruber-Batcho indole synthesis, transition-metal catalyzed SN2 substitution and alkylborylation-protondeborylation. According to the three strategies we proposed, lots of relative reactions were investigated. The results show that it is possible to synthesize the raputindole molecules based on the iridium catalyzed [3+2] annulation of 2-formylarylboronic acids and 1,3-dienes
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Gomes, Umesh Prasad. « Catalyst-assisted and catalyst-free growth of III-V semiconductor nanowires ». Doctoral thesis, Scuola Normale Superiore, 2017. http://hdl.handle.net/11384/85884.

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The aim of this thesis is to understand the dynamics of the nucleation and growth of III-V semiconductor nanowires and associated heterostructures grown by chemical beam epitaxy. These nanowires represent well-controlled and high quality materials suitable for both fundamental physics and applications in optical and electronic devices. The first part of the thesis investigates growth recipes to obtain Au-catalyzed InAs NWs with controlled morphology. Good control of NW length and diameter distributions has been achieved by a systematic study of two different Au deposition techniques: Au thin film deposition and colloidal dispersion. Triggered by the issues of Au contamination and CMOS compatibility, the second part of the thesis is dedicated to the investigation of the nucleation and growth mechanisms of Au-free InAs NWs on Si (111) substrates. A thorough analysis of the silicon substrate preparation is conducted and an optimized silicon surface for the nucleation of Au-free nanowires is identified. We show that the silicon surface can be modified by in situ and ex situ parameters allowing us to control the density of NWs. Growth conditions were established for growing InAs NWs either by catalyst-free or self-catalyzed mechanisms on Si (111). The catalyst-free growth proceeds in the vapor-solid growth mechanism without the use of any catalyst particle while the self-catalyzed growth proceeds in the vapor-liquid-solid mechanism involving a liquid In droplet. Growth models are proposed in order to interpret the experimental findings. The third part of the thesis concerns the growth of axial and radial (core-shell) heterostructured NWs. Nanowire heterostructures combining either highly lattice mismatched materials (GaAs and InAs) or almost lattice matched materials (InAs and GaSb) are investigated. GaAs/InAs and InAs/GaAs axial heterostructures are grown by Au-catalyzed method. Here, it is demonstrated that the catalyst composition, rather than other growth parameters, as postulated so far, controls the growth mode and the resulting NW morphology. We have also explored the growth of core-shell InAs/GaSb heterostructures by catalyst-free mechanism. The morphology and structural properties of InAs/GaSb core-shell heterostructures are optimized to fabricate Esaki tunnel diodes exploiting their broken-gap band alignment.
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Zhou, Edouard. « Nouveaux systèmes catalytiques appliqués aux formations de liaisons C—C par couplage croisé catalysé par des sels de fer : applications, mécanismes ». Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEC008.

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Jabeen, Fauzia. « III-V semiconducting nanowires by molecular beam epitaxy ». Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3097.

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2007/2008
This thesis is devoted to the study of the growth of III-V nanowires (NWs) by catalyst assisted and catalyst free molecular beam epitaxy (MBE). The nanostructures have been routinely characterized by scanning electron microscopy (SEM) and, to a minor extent by transmission electron microscopy (TEM). X-ray photoemission spectroscopy (XPS), scanning photoemission microscopy (SPEM), extended X-ray absrorption fi ne structure analysis (EXAFS), photoluminescence (PL) and trans- port measurements have given an important contribution on specifi c topics. The first section of this thesis reports on GaAs, InAs, and InGaAs NWs growth by Au assisted MBE. A substrate treatment is proposed that improves uniformity in the NWS morphology. Thanks to a careful statistical analysis of the NWs shape and dimensions as a function of growth temperature and duration, evidence is found of radial growth of the NWs taking place together with the axial growth at the tip. This eff ect is interpreted in term of temperature dependent diff usion length of the cations on the NWs lateral surface. The control of the NWs radial growth allowed to grow core shell InGaAs/GaAs NWs, displaying superior optical quality. A new procedure is proposed to protect NWs surface from air exposure. This procedure allowed to perform ex-situ SPEM studies of electronic properties of the NWs. The second part of this thesis is devoted to Au-free NWs growth. GaAs and InAs NWs were successfully grown for the first time using Mn as catalyst. Incorporation of Mn in the NW is studied using EXAFS technique. It is shown that Mn atoms are incorporated in the body of GaAs NWs. Use of low growth temperature is suggested in order to improve the Mn incorporation inside GaAs NWs and obtain NWs with magnetic properties. Finally, growth of GaAs and InAs NWs on cleaved Si subtrate is demonstrated without the use of any outside metal catalyst. Two kinds of nanowires have been obtained. The experimental findings suggest that the two types of nanowires grow after di fferent growth processes.
Questa tesi e' dedicata allo studio della crescita di nanofili di semiconduttori III- V tramite epitassia da fasci molecolari (MBE) assistita da catalizzatore e senza l'uso di catalizzatori. Le nanostrutture sono state caratterizzate sistematicamente tramite microscopia elettronica a scansione (SEM), e in maniera minore microscopia elettronica in trasmissione (TEM). Altre tecniche come la spettroscopia di fotoemissione da raggi x (XPS), la microscopia da fotoemissione in scansione (SPEM), la spettroscopia di assorbimento x (in particolare la extended X-ray absorpition fine structure analysis (EXAFS)) la fotoluminescenza (PL), e il trasporto elettrico hanno dato importanti contributi su problematiche specifiche. La prima parte di questa tesi riguarda la crescita di nanofili di GaAs, InAs e InGaAs tramite MBE assistita da oro. Viene proposto un trattamento del substrato che migliora nettamente l'omogeneita' morfologica dei nanofili. Grazie ad un'attenta analisi statistica della forma e delle dimensioni dei nanofili in funzione della temperatura e del tempo di crescita e' stata dimostrata la crescita radiale dei nanofili, che avviene insieme alla crescita assiale che ha luogo alla punta del nanofilo. Le osservazioni sperimentali sono state interpretate in termini di dipendenza dalla temperatura della lunghezza di diffusione dei cationi sulle super ci laterali dei nanofili. Il controllo della crescita radiale ha permesso di crescere nanofili di InGaAs/GaAs core shell, costituiti cioe' da una anima centrale di InGaAs (core) e uno strato esterno di GaAs (shell) , che hanno dimostrato eccellente qualita' ottica. Viene quindi proposta una nuova procedura per proteggere la super ficie dei nanofili durante l'esposizione all'aria. Grazie a questa e' stato possibile realizzare ex-situ uno studio SPEM delle proprieta' elettroniche dei nanofili. La seconda parte della tesi riguarda la crescita di nanofili senza l'uso di oro. Viene per la prima volta dimostrata la possibilita' di crescere nanofili di GaAs e InAs usando il manganese come catalizzatore. L'incorporazione del Mn come impurezza nei nanofili e' stata studiata tramite EXAFS. Le misure hanno dimostrato che atomi di Mn sono effettivamente incorporate nel corpo dei nano fili. La crescita delle nanostrutture a temperatura piu' bassa potrebbe migliorare qualitativamente l'incorporazione del Mn e permettere la crescita di nanofili con proprieta' magnetiche. Viene in fine dimostrata la crescita di nanofili di GaAs e di InAs senza l'utilizzo di materiali diversi da quelli costituenti il semiconduttore. Tale risultato e' ottenuto su superfici sfaldate di silicio. Sono state osservate nanostrutture di due tipi, che sulla base dei dati sperimentali sembrano essere dovuti a due diversi meccanismi di crescita.
XXI Ciclo
1977
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Livres sur le sujet "Au-catalyzed"

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Bandini, Marco, dir. Au-Catalyzed Synthesis and Functionalization of Heterocycles. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-35144-5.

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Soriano, Elena, et José Marco-Contelles, dir. Computational Mechanisms of Au and Pt Catalyzed Reactions. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21083-9.

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Elena, Soriano, José Marco-Contelles et B. Alcaide. Computational mechanisms of Au and Pt catalyzed reactions. Heidelberg : Springer, 2011.

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Bandini, Marco. Au-Catalyzed Synthesis and Functionalization of Heterocycles. Springer London, Limited, 2016.

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Bandini, Marco. Au-Catalyzed Synthesis and Functionalization of Heterocycles. Springer International Publishing AG, 2016.

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Bandini, Marco. Au-Catalyzed Synthesis and Functionalization of Heterocycles. Springer, 2018.

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Soriano, Elena, et José Marco-Contelles. Computational Mechanisms of Au and Pt Catalyzed Reactions. Springer, 2013.

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Soriano, Elena, et José Marco-Contelles. Computational Mechanisms of Au and Pt Catalyzed Reactions. Springer, 2011.

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Chapitres de livres sur le sujet "Au-catalyzed"

1

Xiao, Yuanjing, et Junliang Zhang. « Au- and Pt-Catalyzed CH Activation/Functionalizations for the Synthesis of Heterocycles ». Dans Transition Metal-Catalyzed Heterocycle Synthesis via CH Activation, 359–402. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527691920.ch12.

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Liu, Zhiming, et Wenjian Wu. « COMPLEX OXIDATION OF TMB CATALYZED WITH PEROXIDASE-LIKE AU NANOPARTICLES ». Dans Nanociências e Nanotecnologia : Pesquisa e Aplicações, 87–97. Editora Artemis, 2022. http://dx.doi.org/10.37572/edart_2908226686.

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Taber, Douglass F. « The Trost Synthesis of Bryostatin 16 ». Dans Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0099.

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In a showcase for the specific transition metal–catalyzed couplings that he has developed, including the elegant Ru-catalyzed coupling of 1 and 2, Barry M. Trost of Stanford University reported (Nature 2008, 456, 485; J. Am. Chem. Soc. 2010, 132, 16403) the total synthesis of the potent anticancer agent, bryostatin 16 4. The preparation of 1 began with commercial 2,2-dimethylpropanediol 5. Brown allylation of the aldehyde 6 followed by protection and oxidative cleavage delivered 8. Condensation (J. Am. Chem. Soc. 2000, 122, 11727) with 9 followed by selective reduction and Sn-catalyzed lactonization led to 10, which was carried on to the ketone 1. The aldehyde 6 was also the starting material for the preparation of 2. Addition of the anion 12 followed by hydrolysis established the unsaturated aldehyde, which was combined with 13 to give the racemic alcohol 14. Oxidation followed by Itsuno-Corey reduction then completed the synthesis of 2. What followed was a spectacular sequence of three transition metal–catalyzed transformations. Intermolecular Ru-mediated coupling of 1 with 2 delivered the tetrahydropyran 3. Pd catalysis effected the selective intramolecular coupling of the two alkynes of the derived ester 15, to give 16. The constrained alkynyl alcohol 16 cyclized under Au catalysis to give the dihydropyran 17, completing the construction of the skeleton of bryostatin 16 4. The route to the bryostatins outlined here is short enough (26 linear steps) and flexible enough to allow a thorough search of structure–activity relationships for this potent class of natural products.
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Taber, Douglass F. « Organic Functional Group Protection and Deprotection ». Dans Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0016.

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Corey R. J. Stephenson of Boston University devised (Chem. Commun. 2011, 47, 5040) a protocol using visible light for removing the PMB group from 1 to give 2. John F. Hartwig, now at the University of California, Berkeley, developed (Science 2011, 332, 439) a Ni catalyst for the cleavage of the durable aryl ether of 3 to give 4. Mark S. Taylor of the University of Toronto devised (J. Am. Chem. Soc. 2011, 133, 3724) the catalyst 6, which selectively mediated esterifi cation of 5 to 7. Jean-Marie Beau of the Université Paris-Sud added (Chem. Commun. 2011, 47, 2146) Et3 SiH following the Fe-catalyzed deprotection-protection of 8, resulting in clean conversion to the bis ether 9. Mahmood Tajbakhsh of the University of Mazandaran showed (Tetrahedron Lett. 2011, 52, 1260) that guanidine HCl catalyzed the conversion of 10 to 11. Stephen W. Wright of Pfizer/Groton established (Tetrahedron Lett. 2011, 52, 3171) that the new urethane protecting group of 12, stable to many conditions, could be deprotected to 13 under conditions that spared even a Boc group. Matthias Beller of the Leibniz-Institute for Catalysis protected (Chem. Commun. 2011, 47, 2152) the amine 14 as the readily hydrolyzed imidazole 16. Sentaro Okamoto of Kanagawa University found (Org. Lett. 2011, 13, 2626) a simple reagent combination for the removal of the sometimes reluctant sulfonamide from 17. Jordi Burés and Jaume Vilarrasa of the Universitat de Barcelona removed (Angew. Chem. Int. Ed. 2011, 50, 3275) the oxime from 19 by Au-catalyzed exchange with 20. Pengfei Wang of the University of Alabama, Birmingham, designed (J. Org. Chem. 2011, 76, 2040) a range of photochemically removable protecting groups for aldehydes and ketones. Rafael Robles of the University of Granada selectively protected (J. Org. Chem. 2011, 76, 2277) the diol 24 using the reagent created by the activation of 25. Berit Olofsson of Stockholm University prepared (Org. Lett. 2011, 13, 3462) the phenyl ester 28 by exposing 27 to the diaryl iodonium triflate. Kannoth Manheri Muraleedharan of the Indian Institute of Technology, Madras, selectively (Org. Lett. 2011, 13, 1932) esterified 29 to 30 with catalytic SmCl3.
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Taber, Douglass F. « Heteroaromatic Synthesis : The Tokuyama Synthesis of (−)-Rhazinilam ». Dans Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0066.

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Mei-Huey Lin of the National Changhua University of Education rearranged (J. Org. Chem. 2014, 79, 2751) the initial allene derived from 1 to the γ-chloroenone. Displacement with acetate followed by hydrolysis led to the furan 2. A. Stephen K. Hashmi of Ruprecht-Karls-Universität Heidelberg showed (Angew. Chem. Int. Ed. 2014, 53, 3715) that the Au-catalyzed conversion of the bis alkyne 3, mediated by 4, proceeded selectively to give 5. Tehshik P. Yoon of the University of Wisconsin used (Angew. Chem. Int. Ed. 2014, 53, 793) visible light with a Ru catalyst to rearrange the azide 6 to the pyrrole 7. Cheol-Min Park, now at UNIST, found (Chem. Sci. 2014, 5, 2347) that a Ni catalyst reorganized the methoxime 8 to the pyrrole 9. A Rh catalyst converted 8 to the corresponding pyridine (not illustrated). In the course of a synthesis of opioid ligands, Kenner C. Rice of the National Institute on Drug Abuse optimized (J. Org. Chem. 2014, 79, 5007) the preparation of the pyridine 11 from the alcohol 10. Vincent Tognetti and Cyrille Sabot of the University of Rouen heated (J. Org. Chem. 2014, 79, 1303) 12 and 13 under micro­wave irradiation to give the 3-hydroxy pyridine 14. Tomislav Rovis of Colorado State University prepared (J. Am. Chem. Soc. 2014, 136, 2735) the pyridine 17 by the Rh-catalyzed combination of 15 with 16. Fabien Gagosz of the Ecole Polytechnique rearranged (Angew. Chem. Int. Ed. 2014, 53, 4959) the azirine 18, readily available from the oxime of the β-keto ester, to the pyridine 19. Matthias Beller of the Universität Rostock used (Chem. Eur. J. 2014, 20, 1818) a Zn catalyst to mediate the opening of the epoxide 21 with the aniline 20. A Rh cata­lyst effected the oxidation and cyclization of the product amino alcohol to the indole 22. Sreenivas Katukojvala of the Indian Institute of Science Education & Research showed (Angew. Chem. Int. Ed. 2014, 53, 4076) that the diazo ketone 23 could be used to anneal a benzene ring onto the pyrrole 24, leading to the 2,7-disubstituted indole 25.
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Taber, Douglass. « Preparation of Heteroaromatic Derivatives ». Dans Organic Synthesis. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199764549.003.0067.

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Several new routes to furans and to pyrroles have recently been put forward. Inspired by the Achmatowicz ring expansion, Patrick J. Walsh of the University of Pennsylvania developed (J. Am. Chem. Soc. 2008, 130, 4097) the oxidative rearrangement of 3-hydrox-alkyl furans such as 1 to the 3-aldehyde 2. José M. Aurrecoechea of the Universidad del País Vasco established (J. Org. Chem. 2008, 73, 3650) that cumulated alcohols, available by reduction of alkynes such as 3 with SmI2, rearrange under Pd catalysis, and then add to an acceptor alkene such as 4, to give the furan 5. Vladimir Gevorgyan of the University of Illinois at Chicago used (J. Am. Chem. Soc. 2008, 130, 1440) an Au catalyst to rearrange an allene such as 6 to the bromo furan 7. Fabien L. Gagosz of the Ecole Polytechnique, Palaiseau, also found (Organic Lett. 2007, 9, 3181) that an Au catalyst rearranged the eneyne 8 to the pyrrole 9. Azido esters such as 10 are readily prepared from the corresponding aldehyde by phosphonate condensation. Shunsuke Chiba and Koichi Narasaka of Nanyang Technology University demonstrated (Organic Lett. 2008, 10, 313) that thermal condensation of 10 with acetyl acetone 11 gave the pyrrole 12, while Cu catalyzed condensation with acetoacetate 13 gave the complementary pyrrole 14. Huan-Feng Jiang of South China University of Technology observed (Tetrahedron Lett. 2008, 49, 3805) that condensation of an acid chloride 15 with an alkyne 16, presumably to give the alkynyl ketone, followed by the addition of hydrazine delivered the pyrazole 17. Masanobu Uchiyama of RIKEN and Florence Mongin of the Université de Rennes 1 established (J. Org. Chem. 2008, 73, 177) that a pre-formed pyrazole 18 could be metalated and then iodinated, to give 19. Xiaohu Deng of Johnson & Johnson, San Diego reported (Organic Lett. 2008, 10, 1307; J. Org. Chem. 2008, 73, 2412) complementary routes to pyrazoles, combining 20 and 21 under acidic conditions to give 22, and under basic conditions to give 23.
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Knochel, P. « Palladium-Catalyzed Acylation ». Dans Compounds of Groups 12 and 11 (Zn, Cd, Hg, Cu, Ag, Au), 1. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-003-00088.

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Knochel, P. « Copper-Catalyzed Reactions ». Dans Compounds of Groups 12 and 11 (Zn, Cd, Hg, Cu, Ag, Au), 1. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-003-00116.

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Zhang, L. « Gold-Catalyzed Propargylic Rearrangements ». Dans Compounds of Groups 12 and 11 (Zn, Cd, Hg, Cu, Ag, Au), 1. Georg Thieme Verlag KG, 2011. http://dx.doi.org/10.1055/sos-sd-103-00017.

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Zhang, L. « Gold-Catalyzed Oxidative Homocoupling ». Dans Compounds of Groups 12 and 11 (Zn, Cd, Hg, Cu, Ag, Au), 1. Georg Thieme Verlag KG, 2011. http://dx.doi.org/10.1055/sos-sd-103-00030.

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Actes de conférences sur le sujet "Au-catalyzed"

1

Pung Swee Yong, Choy Kwang Leong et Hou Xianghui. « Growth of Au-catalyzed and self-catalyzed ZnO nanowires using chemical vapor deposition technique ». Dans 2010 International Conference on Enabling Science and Nanotechnology (ESciNano). IEEE, 2010. http://dx.doi.org/10.1109/escinano.2010.5700937.

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Berdnikov, Yury, Nikolay Sibirev, Jan Schmidtbauer, Mattias Borg, Jonas Johansson et Vladimir Dubrovskii. « Broadening of length distributions of Au-catalyzed InAs nanowires ». Dans MEDICAL PHYSICS : Fourteenth Mexican Symposium on Medical Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4954353.

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Zou, Yichao, Zhi-Gang Chen, Yang Huang, John Drennan et Jin Zou. « Au-catalyzed and catalyst-free growth of one-dimensional Bi2Se3 nanostructures ». Dans 2014 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD). IEEE, 2014. http://dx.doi.org/10.1109/commad.2014.7038638.

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Paiman, S., Q. Gao, H. J. Joyce, H. H. Tan, C. Jagadish, Y. Kim, Y. Guo et J. Zou. « Au-catalyzed InP nanowires : The influence of growth temperature and V/III ratio ». Dans Devices (COMMAD). IEEE, 2010. http://dx.doi.org/10.1109/commad.2010.5699767.

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Yao, Luchi, Xiaohao Zhou et Xiaoshuang Chen. « Configurations of nuclei in Au-catalyzed Si nanowire growth : a first-principles study ». Dans Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), sous la direction de Xiangang Luo, Tianchun Ye, Tingwen Xin, Song Hu, Minghui Hong et Min Gu. SPIE, 2016. http://dx.doi.org/10.1117/12.2242625.

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Zhou Zhang, Lai Mun Wong, Shijie Wang et Tom Wu. « Si substrate controlled in-plane synthesis of self-assembled nanostructures catalyzed by Au nanoparticles ». Dans 2010 IEEE 3rd International Nanoelectronics Conference (INEC). IEEE, 2010. http://dx.doi.org/10.1109/inec.2010.5424568.

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Solorio Alvarado, Cesar, Dipak Patil, María del Gamez Montano et Marco Ramirez Morales. « SYNTHESIS OF BENZO[<em>b</em>]CARBAZOLS BY TANDEM Au(I)-CATALYZED CYCLIZATION/MIGRATION/CYCLIZATION ». Dans The 24th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2020. http://dx.doi.org/10.3390/ecsoc-24-08402.

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