Relevant bibliographies by topics / Salen chiraux

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  2. Dissertations / Theses
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Academic literature on the topic 'Salen chiraux'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "Salen chiraux"

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Gualandi, Andrea, Francesco Calogero, Simone Potenti, and Pier Giorgio Cozzi. "Al(Salen) Metal Complexes in Stereoselective Catalysis." Molecules 24, no. 9 (2019): 1716. http://dx.doi.org/10.3390/molecules24091716.

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Salen ligands are a class of Schiff bases simply obtained through condensation of two molecules of a hydroxyl-substituted aryl aldehyde with an achiral or chiral diamine. The prototype salen, or N,N′-bis(salicylidene)ethylenediamine has a long history, as it was first reported in 1889, and immediately, some of its metal complexes were also described. Now, the salen ligands are a class of N,N,O,O tetradentate Schiff bases capable of coordinating many metal ions. The geometry and the stereogenic group inserted in the diamine backbone or aryl aldehyde backbone have been utilized in the past to ef
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Adão, Pedro, Mannar R. Maurya, Umesh Kumar, et al. "Vanadium-salen and -salan complexes: Characterization and application in oxygen-transfer reactions." Pure and Applied Chemistry 81, no. 7 (2009): 1279–96. http://dx.doi.org/10.1351/pac-con-08-09-07.

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Salen complexes are a versatile and standard system in oxidation catalysis. Their reduced derivatives, called salan, share their versatility but are still widely unexplored. We report the synthesis of a group of new vanadium-salen and -salan complexes, their characterization and application in the oxidation of simple organic molecules with H2O2. The ligands are derived from pyridoxal and chiral diamines (1,2-diaminocyclohexane and 1,2-diphenylethylenediamine) and were easily obtained in high yields. The VIV complexes were prepared and characterized in the solid state (Fourier transform infrare
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Zuo, Shengli, Shuxiang Zheng, Jianjun Liu та Ang Zuo. "Mechanochemical synthesis of unsymmetrical salens for the preparation of Co–salen complexes and their evaluation as catalysts for the synthesis of α-aryloxy alcohols via asymmetric phenolic kinetic resolution of terminal epoxides". Beilstein Journal of Organic Chemistry 18 (10 жовтня 2022): 1416–23. http://dx.doi.org/10.3762/bjoc.18.147.

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In this paper, we report the mechanochemical synthesis of unsymmetrical salens using grinding and ball milling technologies, respectively, both of which were afforded in good yield. The chelating effect of the unsymmetrical salens with zinc, copper, and cobalt was studied and the chiral Co–salen complex 2f was obtained in 98% yield. Hydrolytic kinetic resolution (HKR) of epichlorohydrin with water catalyzed by complex 2f (0.5 mol %) was explored and resulted in 98% ee, suggesting complex 2f could serve as an enantioselective catalyst for the asymmetric ring opening of terminal epoxides by phen
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Li, Ningning, Quanyu Ma, and Jiaxi Xu. "Scandium(III)-Enlarged Salen Complex-Catalyzed Asymmetric Michael Addition of Indoles to Enones." Molecules 30, no. 3 (2025): 459. https://doi.org/10.3390/molecules30030459.

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Salens are a class of important ligands and have been widely applied in asymmetric catalytic organic reactions. Enlarged salen-like ligands containing flexible chains were synthesized from L-phenylalanine, ethane/propanediamines, and salicylaldehydes, and successfully utilized in the scandium-catalyzed enantioselective Michael addition of indoles and enones (2-cinnamoylpyridine 1-oxides). The catalytic system demonstrates excellent reactivity and stereoselective control over electron-rich indole substrates with up to 99% yield and 99% enantiomeric excess. The enlarged Salen ligands with flexib
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Karukurichi, Kannan R., Xiang Fei, Robert A. Swyka, et al. "Mini-ISES identifies promising carbafructopyranose-based salens for asymmetric catalysis: Tuning ligand shape via the anomeric effect." Science Advances 1, no. 6 (2015): e1500066. http://dx.doi.org/10.1126/sciadv.1500066.

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This study introduces new methods of screening for and tuning chiral space and in so doing identifies a promising set of chiral ligands for asymmetric synthesis. The carbafructopyranosyl-1,2-diamine(s) and salens constructed therefrom are particularly compelling. It is shown that by removing the native anomeric effect in this ligand family, one can tune chiral ligand shape and improve chiral bias. This concept is demonstrated by a combination of (i) x-ray crystallographic structure determination, (ii) assessment of catalytic performance, and (iii) consideration of the anomeric effect and its u
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Chaudhary, Pooja, Geeta Devi Yadav, Krishna K. Damodaran, and Surendra Singh. "Synthesis of new chiral Mn(iii)–salen complexes as recoverable and reusable homogeneous catalysts for the asymmetric epoxidation of styrenes and chromenes." New Journal of Chemistry 46, no. 3 (2022): 1308–18. http://dx.doi.org/10.1039/d1nj04758b.

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Soundararajan, Karthikeyan, Helen Ratna Monica Jeyarajan, Raju Subimol Kamarajapurathu, and Karthik Krishna Kumar Ayyanoth. "Facile and innovative catalytic protocol for intramolecular Friedel–Crafts cyclization of Morita–Baylis–Hillman adducts: Synergistic combination of chiral (salen)chromium(III)/BF3·OEt2 catalysis." Beilstein Journal of Organic Chemistry 17 (August 26, 2021): 2186–93. http://dx.doi.org/10.3762/bjoc.17.140.

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The chiral (salen)Cr(III)/BF3·OEt2 catalytic combination was found to be an effective catalyst for intramolecular Friedel–Crafts cyclization of electron-deficient Morita–Baylis–Hillman adducts. In presence of mild reaction conditions the chiral (salen)Cr(III)/BF3·OEt2 complex affords 2-substituted-1H-indenes from unique substrates of Morita–Baylis–Hillman adducts via an easy operating practical procedure.
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Ikbal, Sk Asif, Yoko Sakata, and Shigehisa Akine. "A chiral spirobifluorene-based bis(salen) zinc(ii) receptor towards highly enantioselective binding of chiral carboxylates." Dalton Transactions 50, no. 12 (2021): 4119–23. http://dx.doi.org/10.1039/d1dt00218j.

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Pappalardo, Andrea, Francesco P. Ballistreri, Rosa Maria Toscano, et al. "Alkene Epoxidations Mediated by Mn-Salen Macrocyclic Catalysts." Catalysts 11, no. 4 (2021): 465. http://dx.doi.org/10.3390/catal11040465.

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Three new chiral Mn macrocycle catalysts containing 20 or 40 atoms in the macrocycle were synthetized and tested in the enantioselective epoxidation of cis-β-ethyl-styrene and 1,2-dihydronathalene. The effect of the presence of a binaphtol (BINOL) compound in the catalyst backbone has been evaluated, including by Density Functional Theory (DFT) calculations.
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Jia, Yihong, Asma A. Alothman, Rui Liang, et al. "Oligomeric (Salen)Mn(III) Complexes Featuring Tartrate Linkers Immobilized over Layered Double Hydroxide for Catalytically Asymmetric Epoxidation of Unfunctionalized Olefins." Materials 13, no. 21 (2020): 4860. http://dx.doi.org/10.3390/ma13214860.

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A series of oligomeric (salen)Mn(III) complexes featuring tartrate linkers were prepared and immobilized over layered double hydroxide, and then used as catalysts for asymmetric epoxidation of unfunctionalized olefins. Comprehensive characterizations including 1H NMR, FT-IR, UV-Vis, elemental analysis, GPC, and ICP-AES were used to illustrate structures of oligomeric (salen)Mn(III) complexes, while powdered XRD, nitrogen physisorption, together with XPS studies provided further details to detect structures of heterogeneous catalysts. Interestingly, scanning electron microscopy found an interes
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Dissertations / Theses on the topic "Salen chiraux"

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Zulauf, Anaïs. "Nouveaux complexes salen chiraux polymérisés pour la catalyse asymétrique hétérogène." Paris 11, 2009. http://www.theses.fr/2009PA112170.

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Nous avons développé une méthode originale d’insolubilisation de complexes de type salen chiraux basée sur leur polymérisation par oxydation électrochimique. Ces nouveaux complexes ont été préparés puis électropolymérisés grâce à l’introduction de substituants thiophènes sur les positions 5,5’ du salen. Les polymères insolubles obtenus ont été testés en tant que catalyseurs asymétriques hétérogènes dans différentes réactions de formation de liaisons carbone-carbone ou carbone-hétéroatome catalysé par des complexes de chrome notamment les réactions d��hétéro Diels-Alder, de Henry, d’ouverture d
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Zidelmal, Nacim. "SILIPOLYSALEN : étude du greffage par polymérisation contrôlée de complexes de salen sur silicium pour une application en catalyse asymétrique hétérogène." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS058.

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Les complexes métalliques chiraux de type salen sont connus pour la diversité de leur utilisation en catalyse conduisant à la préparation de nombreux synthons énantio-enrichis. Conformément au concept de chimie verte, l'un des principaux objectifs est d'établir une procédure efficace pour la récupération et la réutilisation de ces catalyseurs. Dans ce contexte, l'objectif de ce travail est de fonctionnaliser la surface du silicium par greffage covalent de ces catalyseurs par polymérisation contrôlée notamment la polymérisation radicalaire par transfert d’atome (ATRP) pour leur récupération et
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Hong, Xiang. "Nouveaux catalyseurs hétérogènes chiraux pour le dédoublement cinétique hydrolytique des époxydesTERMINAUX." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00770302.

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L'objectif de ce travail étaient le développement de catalyseurs hétérogènes efficaces pour promouvoir des réactions asymétriques, en utilisant la polymérisation oxydante ou la formation de polymères de coordination. De nouveaux complexes de salen Co(III) chiraux modifiés par des groupements aromatiques sur les position 5, 5' ont été préparés et testés dans le dédoublement cinétique hydrolytique (HKR) des époxydes terminaux en conditions homogènes. Ces complexes ont été ensuite engagés dans les polymérisations oxydantes électrochimiques ou chimiques, et une stratégie de copolymérisation a four
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Voituriez, Arnaud. "Nouveaux ligands soufrés chiraux pour la catalyse asymétrique homogène : vers l'électrocatalyse asymétrique hétérogène." Paris 11, 2004. http://www.theses.fr/2004PA112132.

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L'objectif est la synthèse par électropolymérisation d'un polymère organique conducteur (POC) chiral, chélatant des métaux de transition, pour une utilisation en électrocatalyse asymétrique hétérogène. Cette approche électrochimique devrait remplacer un co-réducteur ou un co-oxydant, nécessaire en quantité sur-stœchiométrique dans certaines réactions catalytiques. Nous avons préparé dix ligands chiraux, de structure dibenzothiophène et benzothiophène-oxazolines. Les tests en catalyse asymétrique dans la réaction de Tsuji-Trost ont permis d'obtenir, avec le DBT-BOx-iPr, 77% ee pour 90% de rende
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Dandachi, Hiba. "Nouveaux Complexes Oligomères Cycliques de Salens Chiraux pour la Catalyse Asymétrique." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS106/document.

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Les ligands de type salen constituent la pierre angulaire des travaux décrits dans cette thèse. L’attention particulière portée aux complexes chiraux correspondants est due à leur utilisation comme catalyseurs énantiosélectives versatiles pour promouvoir une large gamme de réactions d’intérêt. Dans le contexte de la catalyse asymétrique hétérogène, nous nous focalisons plus particulièrement sur l’élaboration de catalyseurs polymères cycliques de salens chiraux, appelés complexes calixsalens. Ainsi, nous avons mis au point une voie d’accès directe aux calixsalens de cobalt (III) par polycondens
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Tucker, S. C. "Towards novel ligands for catalytic asymmetric oxidation." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242038.

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Zhang, Weiqiang. "Synthesis of novel chiral pyrrolidine-type (salen)Mn(III) complexes." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42403.

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The thesis reports the total syntheses of new chiral pyrrolidine-type salen ligands 5.4 and their corresponding Mn(III) complexes 5.5. The salen ligands were synthesized by condensation of tras-(3R,4R)-diaminopyrrolidine (3.12) or trans-(3R,4R)-1-benzyl-3,4-diaminopyrrolidine (3.10) with two equivalents of (R)-3-formyl-2-hydroxy-2'-phenyl-1,1'-binaphthalene [(R)-4.9]. The salen ligands were transformed to their corresponding Mn(III) complexes following a general procedure. The catalytic performances of the synthesized (salen)Mn(III) complexes in asymmetric epoxidation of 1,2-dihydronaphthalene
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Olcay, Elmali. "Asymmetric Syntheses Of Various Novel Chiral Ligands With Norbornene Backbone: The Use Of Chiral Catalyst In Asymmetric Reactions." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606192/index.pdf.

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The synthetic strategy of this study mainly depends upon the asymmetric desymmetrization of meso norbornene type an anhydride. Asymmetric desymmetrization was achieved by using chinchona alkaloids under kinetically controlled conditions. The resultant mono ester carboxylic acid was epimerized to trans configuration. Subsequent esterification followed by lithium aluminum hydride reduction afforded the first chiral diol ligand with 98 % ee. Transformation of diol to corresponding trans diamine was achieved via Mitsunobu-Gabriel combination. The resultant diamine was first transformed into salen
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Hernandez, Sanchez Dalyanne N. "Synthesis of Chiral Salen-type Ligands for Iridium Catalysts Used in C-H Bond Insertion Reactions." Kent State University Honors College / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1620475657966529.

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Wingstrand, Erica. "New Methods for Chiral Cyanohydrin Synthesis." Doctoral thesis, KTH, Kemi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10205.

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This thesis deals with method development in asymmetric catalysis and specifically syntheses of enantioenriched O-functionalized cyanohydrins. The first part describes the development of a method for the synthesis of O‑alkoxycarbonylated and O-acylated cyanohydrins. Ethyl cyanoformate and acyl cyanides were added to aldehydes in a reaction catalyzed by a chiral dimeric Ti-salen complex together with a tertiary amine. High yields and enantioselectivities were in most cases obtained. Mechanistic studies were performed and a reaction mechanism was proposed. ­ The second part describes a method in
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Books on the topic "Salen chiraux"

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Ertürk, Erkan. Methoden zur enantioselektiven Cyclopropanierung, Hetero-Diels-Alder Reaktion und hydrolytisch-kinetischen Racemattrennung: Chiral Metall-Porphyrine und Metall-Salene in der asymmetrichen Lewis-Säure Katalyse. 2006.

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Book chapters on the topic "Salen chiraux"

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Zhang, Wen-Zhen, and Xiao-Bing Lu. "Chiral Salen Complexes." In Privileged Chiral Ligands and Catalysts. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527635207.ch7.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with chiral salen-type ligand." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_666.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with chiral salen-type ligand." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_667.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of iron(III) complex with chiral salen-type ligand." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53971-2_130.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of copper(II) complex with chiral salen-type ligand." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53974-3_244.

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Lee, Kwang Yeon, Young Hee Lee, Chang Kyo Shin, and Geon Joong Kim. "Chiral (Salen) Complexes Encapsulated in Mesoporous ZSM-5 as an Optical Active Catalyst for Asymmetric Phenolic Ring Opening of Terminal Epoxides." In Solid State Phenomena. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.1809.

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Ollevier, T. "2.11 Iron-Based Chiral Lewis Acid Catalysts in Organic Synthesis." In Base-Metal Catalysis 2. Georg Thieme Verlag KG, 2023. http://dx.doi.org/10.1055/sos-sd-239-00149.

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AbstractVarious synthetic applications of iron-based Lewis acid complexes are presented through their most noteworthy and groundbreaking applications in asymmetric catalysis. The iron Lewis acids are organized according to their structure, and then their reactivity. It has been reported that various chiral iron Lewis acids can be used in a broad range of synthetic transformations. Diverse categories of chiral ligands are used in asymmetric catalysis using chiral iron complexes, including N,N′-dioxides, bipyridines, oxazolines, Schiff bases, salen/salan-type structures, and aminopyridines.
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Wong, Y. S. "Chiral Manganese(III)–salen Catalyzed Epoxidation." In 1,3-Dienes. Georg Thieme Verlag KG, 2009. http://dx.doi.org/10.1055/sos-sd-046-00403.

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Garbaccio, R. M., and S. E. Wolkenberg. "Chiral Aluminum–Salen Complex Catalyzed Strecker Synthesis." In Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-01085.

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Vicens, L., A. Palone, and M. Costas. "2.12 Asymmetric C—H Oxidation with Biologically Inspired Manganese and Iron Catalysts." In Base-Metal Catalysis 2. Georg Thieme Verlag KG, 2023. http://dx.doi.org/10.1055/sos-sd-239-00318.

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AbstractEnantioselective oxidation of aliphatic C—H bonds is the most straightforward and atom-economical approach to prepare chiral oxygenated hydrocarbon skeletons, which are ubiquitous in molecules of biological and industrial relevance. In Nature, this reaction is carried out by metalloenzymes with high levels of efficiency and selectivity. Due to the exquisite performance of enzymatic systems, their active site has served as inspiration for the exploration of artificial catalysts, such as those based on porphyrins or coordination compounds with tetradentate salen- or bis-amine-bis-pyridin
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