Готові списки джерел за темами / C–H Bond - Maleimides

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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "C–H Bond - Maleimides"

1

He, Qiyuan, Yusuke Ano, and Naoto Chatani. "The Pd-catalyzed C–H alkylation of ortho-methyl-substituted aromatic amides with maleimide occurs preferentially at the ortho-methyl C–H bond over the ortho-C–H bond." Chemical Communications 55, no. 67 (2019): 9983–86. http://dx.doi.org/10.1039/c9cc05321b.

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2

Zhao, Sheng-Yin, Hong-Ru Tan, Lun Wang, Jia-Nan Zhu, and Zhen-Hua Yang. "Iodine-Promoted C(sp 2)–H Thiolation of Maleimides with Dimethyl Sulfoxide and Thiols." Synthesis 50, no. 20 (July 30, 2018): 4113–23. http://dx.doi.org/10.1055/s-0037-1609585.

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Iodine-promoted C(sp 2)–H methylthiolation of maleimides using DMSO as synthon has been developed to afford 3-methylthiomaleimides in moderate yields under metal-free conditions. In addition, 3-thiomaleimides were synthesized from maleimides and thiols in the presence of iodine and triethylamine. The methods are simple and efficient for the formation of C–S bond.
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Pan, Changduo, Yun Wang, Chao Wu, and Jin-Tao Yu. "Rhodium-catalyzed C7-alkylation of indolines with maleimides." Organic & Biomolecular Chemistry 16, no. 5 (2018): 693–97. http://dx.doi.org/10.1039/c7ob03039h.

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4

Jeganmohan, Masilamani, Meledath Sudhakaran Keerthana, and Ramasamy Manoharan. "Cobalt(III)-Catalyzed Redox-Neutral Coupling of Acrylamides with Activated Alkenes via C–H Bond Activation." Synthesis 52, no. 11 (March 30, 2020): 1625–33. http://dx.doi.org/10.1055/s-0039-1690866.

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A cobalt(III)-catalyzed coupling of substituted acrylamides with maleimides in the presence of 30 mol% pivalic acid providing olefin-migrated succinimide derivatives in a redox-neutral manner is described. The coupling reaction was examined with various substituted acrylamides and maleimides. The scope of the C–H alkylation reaction was also examined with substituted acrylates. A possible reaction mechanism involving a five-membered cobaltocycle as a key intermediate is proposed.
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5

Sun, Meng, Xiang-Xiang Chen, Jiang-Tao Ren, Jing-Lei Xu, Hu Xie, Wei Sun, and Ya-Min Li. "Cobalt(III)-Catalyzed 1,4-Addition of C(sp3)–H Bonds to Maleimides." Synlett 29, no. 12 (May 29, 2018): 1601–6. http://dx.doi.org/10.1055/s-0037-1609847.

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Quinolines and succinimides play a crucial role in many pharmaceutical and natural products. Although sp2 C–H bond addition reactions have been extensively investigated, Co(III)-catalyzed sp3 C–H bond 1,4-addition reactions are relatively unexplored. In this manuscript, an efficient and atom-economic protocol for alkylation reactions of 8-methylquinolines with maleimides is presented. The reaction exhibits exceptional reactivity, satisfactory yields, excellent chemo- and regioselectivity, and tolerates a variety of functional groups.
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6

Bettadapur, Kiran R., Veeranjaneyulu Lanke, and Kandikere Ramaiah Prabhu. "A deciduous directing group approach for the addition of aryl and vinyl nucleophiles to maleimides." Chemical Communications 53, no. 46 (2017): 6251–54. http://dx.doi.org/10.1039/c7cc02392h.

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A Rh(iii)-catalyzed C–H activation followed by conjugate addition to maleimides, using carboxylic acid as a traceless/deciduous directing group, to formally furnish a Csp2–Csp3 bond is presented.
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7

Zhao, Sheng-Yin, Zhen-Hua Yang, Jia-Nan Zhu, Ze-Hui Jin, and Jian Zheng. "Copper-Catalyzed Intermolecular Thioamination of Maleimides with Thiols and Formamides: A One-Step Construction of 3-Amino-4-thiomaleimides Using Formamides as Nitrogen Sources." Synthesis 50, no. 23 (August 7, 2018): 4627–36. http://dx.doi.org/10.1055/s-0037-1610536.

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A highly efficient copper-catalyzed intermolecular C(sp2)–H thioamination of maleimides with thiols and formamides in the presence of fluoroboric acid is reported using various readily available formamides as nitrogen sources and solvents. A diverse range of 3-amino-4-thiomaleimides is obtained with good yields under mild conditions, involving C–N and C–S bond formation. This methodology enriches current C–N and C–S bond formation chemistry and features operational simplicity and excellent functional-group tolerance.
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Chen, Xiangxiang, Jiangtao Ren, Hu Xie, Wei Sun, Meng Sun, and Biao Wu. "Cobalt(iii)-catalyzed 1,4-addition of C–H bonds of oximes to maleimides." Organic Chemistry Frontiers 5, no. 2 (2018): 184–88. http://dx.doi.org/10.1039/c7qo00687j.

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9

Mangialetto, Jessica, Kiano Gorissen, Lise Vermeersch, Bruno Van Mele, Niko Van den Brande, and Freija De Vleeschouwer. "Hydrogen-Bond-Assisted Diels–Alder Kinetics or Self-Healing in Reversible Polymer Networks? A Combined Experimental and Theoretical Study." Molecules 27, no. 6 (March 17, 2022): 1961. http://dx.doi.org/10.3390/molecules27061961.

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Diels–Alder (DA) cycloadditions in reversible polymer networks are important for designing sustainable materials with self-healing properties. In this study, the DA kinetics of hydroxyl-substituted bis- and tetrafunctional furans with bis- and tris-functional maleimides, both containing ether-functionalized spacers, is investigated by modelling two equilibria representing the endo and exo cycloadduct formation. Concretely, the potential catalysis of the DA reaction through hydrogen bonding between hydroxyl of the furans and carbonyl of the maleimides or ether of the spacers is experimentally and theoretically scrutinized. Initial reaction rates and forward DA rate constants are determined by microcalorimetry at 20 °C for a model series of reversible networks, extended with (i) a hydroxyl-free network and hydroxyl-free linear or branched systems, and (ii) polypropylene glycol additives, increasing the hydroxyl concentration. A computational density-functional theory study is carried out on the endo and exo cycloadditions of furan and maleimide derivatives, representative for the experimental ones, in the absence and presence of ethylene glycol as additive. Additionally, an ester-substituted furan was investigated as a hydroxyl-free system for comparison. Experiment and theory indicate that the catalytic effect of H-bonding is absent or very limited. While increased concentration of H-bonding could in theory catalyze the DA reaction, the experimental results rule out this supposition.
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Muniraj, Nachimuthu, and Kandikere Ramaiah Prabhu. "Cobalt(III)-Catalyzed C–H Activation: Azo Directed Selective 1,4-Addition of Ortho C–H Bond to Maleimides." Journal of Organic Chemistry 82, no. 13 (June 19, 2017): 6913–21. http://dx.doi.org/10.1021/acs.joc.7b01094.

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Дисертації з теми "C–H Bond - Maleimides"

1

Torkelson, Jeffrey Robert. "C-H bond activation and C-C bond formation at adjacent metals." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ34848.pdf.

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2

Guo, Xiangyu. "Ruthenium-catalyzed C-C bond formation via functional-group directed C-H bond activation." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110570.

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AbstractRuthenium-Catalyzed C-C Bond Formation via Functional-Group Directed C-H Bond ActivationXiangyu GuoAdvisor: Prof. Chao-Jun LiMcGill UniversityThis thesis is an investigation on the formation of carbon-carbon (C-C) bonds in the presence of ruthenium catalyst.In the first part of this thesis, oxidative dehydrogenative coupling reactions for carbon-carbon (C-C) bond formation are described. A ruthenium-catalyzed dimerization of 2-phenylpyridine derivatives is demonstrated to synthesize biaryls using iron(III) chloride as the terminal oxidant. In addition, the oxidative cross coupling of arenes and cycloalkanes is also illustrated, achieving a unique para-selectivity.In the second part of the thesis, a ruthenium-catalyzed olefination via decarbonylative addition of aldehydes to terminal alkynes is described. Conjugated and isolated C=C bonds can be chemoselectively generated in two catalytic systems starting from aromatic and aliphatic aldehydes. The method provides an alternative synthesis of C=C bonds from direct C-H bond addition to triple bonds.
RésuméRuthenium-Catalyzed C-C Bond Formation via Functional-Group Directed C-H Bond ActivationXiangyu GuoSuperviseur: Prof. Chao-Jun LiUniversité McGillCette thèse est le résultat de la recherche sur la formation de liaisons carbone-carbone (C-C), catalysé par le ruthénium. La première partie de cette thèse expose les résultats sur la formation de liaison carbone-carbone (C-C) par la réaction de couplage oxydant par déshydrogénation. La synthèse de composés biaryl par l'utilisation d'un catalyseur de ruthénium a permis la dimérisation des dérivés de la 2-phénylpyridine en présence de chlorure de fer (III) comme oxydant terminal. En outre, l'oxydative cross-coupling entre arènes et cycloalcanes, a montrer une notable, para-sélectivité. La seconde partie de cette thèse, décrit les résultats obtenue sur la réaction d'oléfination decarbonylative entre un aldéhyde et un alcyne vrai, catalyser par le ruthénium. En partant d'aldéhydes aromatiques ou aliphatiques et par l'utilisation de deux systèmes catalytiques, la synthèse chemioselective de double liaison C=C conjuguée ou isolée ont pu être réalisé. Cette réaction fournit ainsi, une intéressante alternative à la synthèse de doubles liaisons C=C par la directe addition de liaison C-H sur une triple liaison.
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Laren, Martijn Wouter van. "Palladium-catalyzed C-H and C-N bond formation." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/75422.

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4

Vastine, Benjamin Alan. "Understanding mechanisms for C-H bond activation." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2679.

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5

Wiley, Jack Scott. "C-H bond activation in iridium complexes /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/8510.

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6

Truscott, Fiona Rosemary. "Transition metal catalysed C-C bond formation via C-H functionalisation." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:6a1ef296-8d63-470d-96bd-3e01a887c81f.

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The functionalisation of C-H bonds has been widely studied in organic synthesis. This work presents the results of investigation into two areas of current research, copper-catalysed aromatic C-H functionalisation and rhodium-catalysed hydroacylation. Chapter 1 presents the development of palladium- and copper-catalysed aromatic C-H functionalisation with particular attention paid to regiocontrol. Chapter 2 describes the development of copper-catalysed cross-coupling of perfluorinated arenes and alkenyl halides along with efforts to expand this methodology to a more general reaction. In Chapter 3 the development of chelation-controlled rhodium-catalysed hydroacylation is discussed. Chapter 4 outlines the utilisation of amino acid derived N-methylthiomethyl aldehydes in rhodium-catalysed hydroacylation methodology.
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Catino, Arthur John. "Oxidative C-H and C-C bond functionalization catalyzed by dirhodium caprolactamate." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/4188.

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Thesis (Ph. D.)--University of Maryland, College Park, 2006.
Thesis research directed by: Chemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Gao, Longhui. "C-H bond activation catalyzed by Ruthenium nanoparticles." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS348/document.

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Les molécules marquées par des isotopes de l’hydrogène possèdent de nombreuses applications dans divers domaines tels que la chimie, la biologie ou en science des matériaux. Dans le domaine de la recherche de nouveaux médicaments, les études liées à la pharmacocinétique nécessitent un accès rapide à des molécules marquées afin de ne pas impacter les coûts et les délais de développement. Le développement de la métabolomique a aussi entrainé une augmentation du besoin en molécules marquées isotopiquement. En effet, les molécules deuterées peuvent être utilisées en tant qu’étalons internes pour la quantification rapide des métabolites présents dans des tissus ou des fluides biologiques. La première partie de cette thèse concerne le développement d’une méthode générale de marquage de motifs de type thioéther dans des molécules complexes à l’aide d’une nouvelle réaction d’échange isotopique (catalysée par des nanoparticules de Ruthénium). D’un point de vue fondamental cette transformation représente le premier exemple de (Csp³)-H activation dirigée par un atome de soufre. En termes d’application, cette nouvelle réaction permet la synthèse rapide d’étalons internes pour la quantification LC-MS/MS et le marquage tritium de molécules complexes. La seconde partie de cette thèse relate le développement d’une nouvelle méthode d’homocouplage de phénylpyridines catalysée par Ru/C. Différents substrats comportant des substituants riches et pauvres en électron ont été couplés avec de bons rendements. Ces dimères ont ensuite été utilisés pour synthétiser de nouveaux complexes de bore dont les propriétés photophysiques ont été étudiées. Dans une troisième partie, la mise au point d’une réaction palladocatalysée permettant d’obtenir des molécules polycycliques contenant un motif de type pyridine est développée
Deuterated and tritiated compounds are widely used in numerous applications in chemistry, biology and material science. In the drug discovery and development process, ADME studies require quick access to labelled molecules, otherwise the drug development costs and timeline are significantly impacted. The rapid development of metabolomics has also increased the need for isotopically labelled compounds. In particular, deuterated molecules are used as internal standards for quantitative LC-MS/MS analysis of metabolites in biological fluids and tissues. In this context, a general method allowing the deuterium and tritium labelling of bioactive thioethers using a HIE reaction is described in the first chapter. From a fundamental point of view, this transformation is the first example of (Csp³)-H activation directed by a sulfur atom. In terms of application, this new reaction has been proved to be useful for the preparation of deuterated LC-MS/MS reference materials and tritiated pharmaceuticals owning high specific activity.In the second chapter of this manuscript, the development of a method allowing the cross-dehydrogenative homocoupling of 2-arylpyridines catalyzed by Ru/C is developed. Various substrates with different substituents were efficiently coupled to give the desired dimers in good yield. In terms of application, a series of pyridine-boron complexes derived from the phenyl pyridine dimers were also synthesized and their photophysical properties were studied.In the third chapter, a regioselective palladium catalyzed intramolecular arylation reaction allowing the synthesis of pyridine containing polycyclic compounds is described
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Ebe, Yusuke. "Iridium-Catalyzed Carbon-Carbon Bond Formation Reactions via C-H Bond Activation." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225417.

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Locati, Abel Jean Serge. "Computational study of c-h bond cleavage and c-c bond formation processes catalyzed by transition metal complexes." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/79120.

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La primera parte de la tesis se dedica al estudio del mecanismo de una reacción de activación C-H por un complejo de niobio. Se racionalizó el mecanismo de activación de enlaces C-H del benceno por el complejo TpMe2NbCH3(c-C3H5)(MeCCMe). El intermedio clave es un complejo inusual de 2-ciclopropeno. Conseguimos también racionalizar las selectividades obtenidas para la activación de varios alquilaromáticos por el complejo de niobio 2-ciclopropeno. También se investigó el papel del ligando alquino en estos complejos y su posible papel en procesos de migración de ligandos. En la segunda parte de la tesis, se investigaron las reacciones de acoplamiento cruzado con reactivos basados en silicio. Los resultados sugieren que la transmetalación es más fácil después de la disociación de la fosfina, o cuando un ligando bromuro está coordinado al paladio. El efecto beneficioso de la dibencilidenoacetona en el acoplamiento también fue aclarado.
The first part of the thesis is mainly devoted to the mechanism of a C-H activation reaction by a niobium complex. The mechanism of C-H bond activation of benzene by the TpMe2NbCH3-(c-C3H5)-(MeCCMe) complex was rationalized. The key intermediate is an unusual 2-cyclopropene complex. We rationalized the selectivities obtained for the activation of several alkylaromatics by the 2-cyclopropene niobium complex. The intriguing role of the alkyne ligand of the same complex, and its possible role in the migration processes, was investigated. In the second part of the thesis, we focused on the silicon based cross-coupling. The results suggest than the transmetalation is easier after phosphine dissociation, and in presence of the bromide ligand on the palladium. The beneficial effect of dibenzylideneacetone on the coupling was clarified.
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Книги з теми "C–H Bond - Maleimides"

1

Ribas, Xavi, ed. C-H and C-X Bond Functionalization. Cambridge: Royal Society of Chemistry, 2013. http://dx.doi.org/10.1039/9781849737166.

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Xie, Jin, and Chengjian Zhu. Sustainable C(sp3)-H Bond Functionalization. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49496-7.

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Dixneuf, Pierre H., and Henri Doucet, eds. C-H Bond Activation and Catalytic Functionalization II. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29319-6.

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Dixneuf, Pierre H., and Henri Doucet, eds. C-H Bond Activation and Catalytic Functionalization I. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24630-7.

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Matsumoto, Arimasa. Iron-Catalyzed Synthesis of Fused Aromatic Compounds via C–H Bond Activation. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54928-4.

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Maiti, Debabrata, and Srimanta Guin, eds. Remote CH Bond Functionalizations. Wiley, 2021. http://dx.doi.org/10.1002/9783527824137.

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Xie, Jin, and Chengjian Zhu. Sustainable C(sp3)-H Bond Functionalization. Springer, 2016.

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8

Xie, Jin, and Chengjian Zhu. Sustainable C(sp3)-H Bond Functionalization. Springer London, Limited, 2016.

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9

Lukašēvics, Tomass. Kobalta katalizēta C‒H saites funkcionalizēšana/Cobalt Catalyzed C‒H Bond Functionalization. RTU Press, 2022. http://dx.doi.org/10.7250/9789934227806.

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Over the past few decades, transition metal catalyzed C–H activation has been immensely investigated due to the ability to functionalize relatively unreactive C-H bonds whilst simplifying synthetic schemes and making the synthetic pathway more economical. Nowadays, a great emphasis has been placed on substitution of noble metal catalysts (Pd, Rh, Ru, etc.) with more abundant and cheaper alternatives (Cu, Co, Ni). The aim of the Doctoral Thesis is the development of novel cobalt catalyzed C-H bond functionalization methodology. The Doctoral Thesis is prepared as a collection of publications. The main results of the Thesis were summarized in 4 scientific publications, 3 review articles and 2 book chapters.
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C-H Bond Activation in Organic Synthesis. Taylor & Francis Group, 2015.

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Частини книг з теми "C–H Bond - Maleimides"

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Satoh, Tetsuya, and Masahiro Miura. "C-H Bond Alkenylation." In Metal-Catalyzed Cross-Coupling Reactions and More, 1389–426. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527655588.ch18.

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Otake, Masayuki. "Energy Storage in C–C, H–H and C–H Bond." In Lecture Notes in Energy, 123–33. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-25400-5_8.

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Bouffard, Jean, and Kenichiro Itami. "Rhodium-Catalyzed C–H Bond Arylation of Arenes." In C-H Activation, 231–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/128_2009_12.

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4

Wasa, Masayuki, Kelvin S. L. Chan, and Jin-Quan Yu. "Asymmetric C-H Bond Functionalization." In Asymmetric Synthesis II, 267–72. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527652235.ch33.

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Liu, Guosheng, and Yichen Wu. "Palladium-Catalyzed Allylic C–H Bond Functionalization of Olefins." In C-H Activation, 195–209. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/128_2009_16.

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Ackermann, Lutz, and Rubén Vicente. "Ruthenium-Catalyzed Direct Arylations Through C–H Bond Cleavages." In C-H Activation, 211–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/128_2009_9.

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Lebel, Hélène. "Rhodium-Catalyzed CH Aminations." In Catalyzed Carbon-Heteroatom Bond Formation, 137–55. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527633388.ch5.

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You, Shu-Li, and Ji-Bao Xia. "Palladium-Catalyzed Aryl–Aryl Bond Formation Through Double C–H Activation." In C-H Activation, 165–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/128_2009_18.

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Beck, Elizabeth M., and Matthew J. Gaunt. "Pd-Catalyzed C–H Bond Functionalization on the Indole and Pyrrole Nucleus." In C-H Activation, 85–121. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/128_2009_15.

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Ilies, Laurean, and Eiichi Nakamura. "Iron-Catalyzed C–H Bond Activation." In Topics in Organometallic Chemistry, 1–18. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_129.

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Тези доповідей конференцій з теми "C–H Bond - Maleimides"

1

Ulin-Avila, Erick, and Akhilesh Kumar Mishra. "Graphene-based Photonic C-H bond activation." In Frontiers in Optics. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/fio.2021.jtu1a.55.

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Wang, Xueqiang, Joan G. Donaire, and Ruben Martin. "Metal-Free sp2 and sp3 C-H Functionalization/C-O Bond Forming Reaction." In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013815132216.

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3

Nyambo, Silver, Dong-Sheng Yang, and Yuchen Zhang. "PROBING SELECTIVE BOND ACTIVATION IN ALKYLAMINES: LANTHANUM-MEDIATED C-H AND N-H BOND ACTIVATION STUDIED BY MATI SPECTROSCOPY." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.fb01.

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4

Kim, Jong, and Dong-Sheng Yang. "YTTRIUM-ASSISTED C-H AND C-C BOND ACTIVATION OF ETHYLENE PROBED BY MASS-ANALYZED THRESHOLD IONIZATION SPECTROSCOPY." In 71st International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2016. http://dx.doi.org/10.15278/isms.2016.ri06.

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Lian, T., S. E. Bromberg, H. Yang, M. Asplund, R. G. Bergman, and C. B. Harris. "Femtosecond IR Studies of Alkane C-H Bond Activation by Organometallic Compounds." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.fe.27a.

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The mechanism of alkane C-H bond activation by transition metal complexes such as CpM(CO)2 (M=Rh, Ir) has been intensely studied because it represents a first step in a catalytic process using unreactive hydrocarbons.[1] The bond activation reaction starts with the formation of monocarbonyl intermediates such as CpRh(CO). These species have been detected in the gas phase[2] and in liquefied rare Kr and Xe[3] by µs time resolved IR spectroscopy. Unfortunately, the subsequent oxidative insertion of CpRh(CO) into the C-H bond is not well understood due to its rapid rate and low quantum yield (~1%) for formation of the C-H activated product. These properties have hindered previous femtosecond and picosecond time-resolved studies of activation reaction in room temperature alkane solution. [4]
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Baba, Masaaki, Umpei Nagashima, and Tsuneo Hirano. "AB INITIO CALCULATIONS ON ROTATIONAL CONSTANT AND AVERAGED C-H(D) BOND LENGTHS OF BENZENE." In 2020 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2020. http://dx.doi.org/10.15278/isms.2020.tj09.

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7

Kim, Jong, and Dong-Sheng Yang. "SPECTROSCOPIC IDENTIFICATION OF Y(C4H6) ISOMERS FORMED BY YTTRIUM-MEDIATED C-H BOND ACTIVATION OF BUTENES." In 71st International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2016. http://dx.doi.org/10.15278/isms.2016.mh09.

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8

Subramanian, Raghavendran, and Kazem Kazerounian. "Improved Molecular Model of a Peptide Unit for Proteins." In ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/detc2006-99315.

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Pauling, Corey and Branson in their seminal paper in 1951 reported numerical values for the bond lengths and bond angles for a peptide unit in proteins. These values became the standard model for several decades after that. This classic peptide model was either confirmed or improved upon by other researchers over the years, by using more advanced X-Ray diffraction equipments. In this paper, we have made an attempt to calibrate the values of these bond lengths and bond angles based on a systematic and deterministic approach applied to a collection of proteins defined structurally in the Protein Data Bank (PDB). Our method is based on the assumption that a peptide chain is a serial chain of identical rigid bodies connected by revolute joints (i.e. dihedral angles). The proposed procedure first computes the best estimate for the dihedral angles in the presence of inaccuracies in the atoms’ coordinates data. Then these values are used to find the conformation of the peptide chain using the calibrated model of the peptide unit. Through an optimization process, the structural error (RMSD of all atoms) between the resultant conformation and the PDB data is minimized to yield the best values for the bond length and bond angles in the calibrated peptide unit. Our numerical experiments indicate that by making small changes in the Pauling-Corey peptide model parameters (0.15% to 8.7%) the structural error is reduced significantly (3.0% to 57.4%). The optimum values for the bond angles and bond lengths are as follow: Bond Lengths: N-C(A): 1.4721Å, C(A)-C: 1.6167Å, C-N: 1.2047Å, C=O: 1.1913Å and N-H: 0.9621Å. Bond Bending Angles: N-C(A)-C: 109.6823°, C(A)-C=0: 119.518°, C(A)-C-N: 114.5553°, O=C-N: 125.9233°, C-N-H: 123.5155°, C-N-C(A): 121.5756°, C(A)-N-H: 114.901°. Peptide bond torsion angle: ω: 179.4432°.
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Pint, Bruce A., Michael J. Lance, and J. Allen Haynes. "The Effect of Coating Composition and Geometry on TBC Lifetime." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-65103.

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Several factors are being investigated that affect the performance of thermal barrier coatings (TBC) for use in land-based gas turbines where coatings are mainly thermally sprayed. This study examined high velocity oxygen fuel (HVOF), air plasma sprayed (APS) and vacuum plasma sprayed (VPS) MCrAlYHfSi bond coatings with APS YSZ top coatings at 900°–1100°C. For superalloy 247 substrates and VPS coatings tested in 1-h cycles at 1100°C, removing 0.6wt.%Si had no effect on average lifetime in 1-h cycles at 1100°C, but adding 0.3%Ti had a negative effect. Rod specimens were coated with APS, HVOF and HVOF with an outer APS layer bond coating and tested in 100-h cycles in air+10%H2O at 1100°C. With an HVOF bond coating, initial results indicate that 12.5 mm diameter rod specimens have much shorter 100-h cycle lifetimes than disk specimens. Longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.
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Jay, Raphael M., Ambar Banerjee, Torsten Leitner, Robert Stefanuik, Ru-Pan Wang, Jessica Harich, Emma Beale, et al. "From Femtosecond Excited-State and Dissociation Dynamics to Nanosecond Reaction Kinetics: Following C-H Bond Activation with X-rays." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/up.2022.tu1a.2.

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Using ultrafast X-ray absorption spectroscopy, we observe how a rhodium carbonyl catalyst is formed on femtosecond timescales and reveal the decisive orbital interactions which facilitate the efficient cleavage of an alkane C-H bond from solution.
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Звіти організацій з теми "C–H Bond - Maleimides"

1

Lees, Alistair J. Photochemistry of Intermolecular C-H Bond Activation Reactions. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/761218.

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2

Asplund, M. C. Time resolved infrared studies of C-H bond activation by organometallics. Office of Scientific and Technical Information (OSTI), June 1998. http://dx.doi.org/10.2172/290889.

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Lees, A. J. [Photochemistry of intermolecular C-H bond activation reactions]. Progress report, [September 15, 1994--March 15, 1995]. Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/35271.

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