Relevant bibliographies by topics / Carbon metal bond cleavage

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Carbon metal bond cleavage'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Carbon metal bond cleavage"

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Kakiuchi, Fumitoshi, and Takuya Kochi. "Transition-Metal-Catalyzed Carbon-Carbon Bond Formation via Carbon-Hydrogen Bond Cleavage." Synthesis 2008, no. 19 (September 5, 2008): 3013–39. http://dx.doi.org/10.1055/s-2008-1067256.

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Zhu, Chunyin, Wei Wei, Peng Du, and Xiaobing Wan. "Metal free amide synthesis via carbon–carbon bond cleavage." Tetrahedron 70, no. 51 (December 2014): 9615–20. http://dx.doi.org/10.1016/j.tet.2014.11.003.

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Murakami, Masahiro, and Takanori Matsuda. "ChemInform Abstract: Metal-Catalyzed Cleavage of Carbon-Carbon Bond." ChemInform 42, no. 20 (April 21, 2011): no. http://dx.doi.org/10.1002/chin.201120217.

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Wang, Yifan, and Aimin Liu. "Carbon–fluorine bond cleavage mediated by metalloenzymes." Chemical Society Reviews 49, no. 14 (2020): 4906–25. http://dx.doi.org/10.1039/c9cs00740g.

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Organic fluorochemicals are widely distributed in the environment, causing ecological and health concerns. However, defluorination is a challenging process. This article summarizes the defluorination mechanisms learned from metal-containing enzymes.
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Masarwa, Ahmad, and Ilan Marek. "Selectivity in Metal-Catalyzed CarbonCarbon Bond Cleavage of Alkylidenecyclopropanes." Chemistry - A European Journal 16, no. 32 (August 17, 2010): 9712–21. http://dx.doi.org/10.1002/chem.201001246.

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Edelbach, Brian L., A. K. Fazlur Rahman, Rene J. Lachicotte, and William D. Jones. "Carbon−Fluorine Bond Cleavage by Zirconium Metal Hydride Complexes." Organometallics 18, no. 16 (August 1999): 3170–77. http://dx.doi.org/10.1021/om9902481.

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Zhu, Chunyin, Wei Wei, Peng Du, and Xiaobing Wan. "ChemInform Abstract: Metal Free Amide Synthesis via Carbon-Carbon Bond Cleavage." ChemInform 46, no. 18 (April 16, 2015): no. http://dx.doi.org/10.1002/chin.201518092.

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Darensbourg, Marcetta Y., and Donald J. Darensbourg. "The Chemistry of the Metal-Carbon Bond. Volume 2. The Nature and Cleavage of Metal-Carbon Bonds." Organometallics 5, no. 4 (April 1986): 828. http://dx.doi.org/10.1021/om00135a600.

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Eaborn, Colin. "The Chemistry of the Metal—Carbon Bond. Volume 2, The Nature and Cleavage of Carbon—Metal Bonds." Journal of Organometallic Chemistry 288, no. 3 (June 1985): c61. http://dx.doi.org/10.1016/0022-328x(85)80139-x.

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Murakami, Masahiro, and Takanori Matsuda. "Metal-catalysed cleavage of carbon–carbon bonds." Chem. Commun. 47, no. 4 (2011): 1100–1105. http://dx.doi.org/10.1039/c0cc02566f.

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Dissertations / Theses on the topic "Carbon metal bond cleavage"

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Saraf, Sushma L. "Oxidative Carbon-Carbon Bond Cleavage Reactions of Metal Flavonolato and Chlorodiketonate Complexes." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/5161.

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The research presented in this dissertation has focused on studies of metal complexes which undergo oxidative aliphatic carbon-carbon bond cleavage using dioxygen as the oxidant. The goal of this research was to assess the reactivity and elucidate mechanistic details of the carbon-carbon bond cleavage reactions. The first part of this dissertation explores the light-induced dioxygenase reactivity of ruthenium flavonolato compounds. These compounds are of particular interest as they are currently being explored for their anti-cancer activity. The RuII(n6-p-cymene) flavonolato compounds studied were found to undergo photoinduced carbon-carbon bond cleavage albeit with low quantum efficiency. The cleaved products were found to be significantly less toxic than the starting material. The reactivity and loss of toxicity offers the possibility of light-induced deactivation of such compounds to limit overall toxicity. The remainder of the research presented in this dissertation is directed at understanding mechanistic features that govern the aliphatic carbon-carbon bond cleavage reactivity of mononuclear copper(II) chlorodiketonate complexes. Synthetic organic chemists have utilized molecular oxygen and copper catalysts for many organic transformations. However, few reports have appeared demonstrating aliphatic carbon-carbon bond cleavage mediated by copper and O2 and mechanistic details of these processes are limited. The previously reported complex [(6-Ph2TPA)Cu(PhC(O)CClC(O)Ph)]ClO4 was found to undergo aliphatic carbon-carbon bond cleavage under ambient conditions in the presence of O2. Notably, a catalytic amount of chloride anion increases the rate of this reaction. In order to understand this enhanced reactivity, we have performed mechanistic experiments to probe this system. These include: (1) spectroscopic studies to probe anion binding to the copper center; (2) variable temperature kinetic studies to benchmark computational studies; and (3) evaluation of the impact of electron density within the chlorodiketonate substrate on the rate of the reaction. The nature of the anion in the [(6-Ph2TPA)Cu(PhC(O)CClC(O)Ph)]ClO4 system was found to play a significant role in terms of the energy barriers associated with O2 activation and O-O bond cleavage. The electronic nature of the chlorodiketonate was found to affect the kinetics for the C-C bond cleavage reaction suggesting a change in mechanism for O2 activation depending on the substituent present.
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Sawano, Shota. "Transformation of Organic Molecules Based on Ring Opening of Four-Membered Carbon Skeletons." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/200505.

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Gray, Steven Daniel. "Activation of nitrogen heterocycles towards the fundamental reactions of hydrodenitrogenation catalysis: Transition metal mediated carbon-nitrogen bond cleavage, hydrogenation, and ring degradation." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187054.

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Treatment of the η(N,C)-pyridine complex [η²(N,C)-2,4,6-NC₅ᵗBU₃H₂]TA(DIPP)₂Cl (DIPP = 2,6-diisopropylphenoxide) with LiBEt₃H affords the C-N bond scission product (DIPP)₂Ta(=NCᵗBu=CHCᵗBu=CHCHᵗBu) (4). Reaction of [η²(N,C)-2,4,6-NC₅ᵗBU₃H₂]TA(DIPP)₂Cl with the appropriate alkyl lithium or Grignard reagent provides the alkyl derivatives [η²(N,C)-2,4,6-NC₅ᵗBU₃H₂]TA(DIPP)₂R [R = Me (5); Et (6); ⁿPr (7); ⁿBu (8); Ph (9); CH₂SiMe₃ (10)] in high yield. The molecular structure of the ethyl complex, [η²(N,C)-2,4,6-NC₅ᵗBU₃H₂]TA(DIPP)₂Et (6) has been determined. Upon thermolyzing complexes 5 - 9, a metal-ta-pyridine ligand alkyl migration is effected and the C-N bond cleavage products (DIPP)₂Ta(=NCᵗBu=CHCᵗBu=CHCHᵗBuR) [R = Ph (11); Me (12); Et (13); ⁿPr (14); ⁿBu (15)] are formed. Kinetic and mechanistic studies of the 5 → 12 conversion, indicate that methyl migration is strictly intramolecular; thus a formal endo attack on the η²(N,C)-pyridine ligand has occurred. While (DIPP)₂Ta(=NCᵗBu=CHCᵗBu=CHCHᵗBu) (4) and (DIPP)₂Ta(=NCᵗBu=CHCᵗBu=CHCᵗBuPh) (11) are indefinitely stable and are structurally characterized, the β-hydrogen containing alkyl derivatives, (DIPP)₂Ta(=NCᵗBu=CHCᵗBu=CHCᵗBuCHR') [R' = H (12); Me(13); Et (14); ⁿPr (15)] decompose to provide the metallapyridine complex, [(DIPP₂Ta(μ- NCᵗBu=CHCᵗBu=CH)₂ (16) and the t-butyl-substituted alkenes ᵗBuCH=CHR', respectively. The structure of 16 is reported. Labelling studies reveal the source of the ᵗBuCH=CH₂ in the 5 → 12 → 16 conversion and the decomposition of 12 to 16 and ᵗBuCH=CH₂ is proposed to proceed via the eight-membered, ring-expansion isomer, (DIPP₂)Ta(=NCᵗBu=CHCᵗBu=CHCᵗBuCH₂) (17). An acetonitrile adduct of this intermediate, (DIPP)Ta(=NCᵗBu=CHCᵗBu=CHCᵗBuCH₂)(MeCN)₂ (17-MeCN), has been trapped. An overall mechanism for the decomposition (DIPP)₂Ta(=NCᵗBu=CHCᵗBu=CHCᵗBuCH₂R') [R' = H (12); Me(13); Et (14); ⁿPr (15)] to [(DIPP)₂Ta(μ-NCtBu=CHCᵗBu=CH)₂ (16) and ᵗBuCH=CHR', based on these observations, is proposed. The heterocyclic complexes [η¹(N)-QUIN]Ta(Oar)₃Cl₂ (18) and [η ¹(N)-6MQ]- Ta(Oar)₃Cl₂ (19) (QUIN = quinoline, and 6MQ = 6-methylquinoline) are prepared from Ta(Oar)₃Cl₂(OEt₂) and QUIN or 6MQ. [η¹(N)-6MQ]Ta(OAr)₂Cl₃ (20) is prepared similarly from Ta(OAr)₂Cl₃(OEt₂). Upon rapid, two-electron reduction of these complexes, an η¹(N) → η²(N,C) bonding rearrangement is effected and the thermally sensitive, d² species [η²(N,C)-QUIN]Ta(Oar)₃ (21), [η²(N,C)-6MQ]Ta(Oar)₃ (22), and [η²(N,C)-6MQ]Ta(OAr)₂- Cl(OEt₂) (25) can be isolated. The PME₃ adducts [η²(N,C)-QUIN]Ta(Oar)₃(PMe₃) (23) and [η²(N,C)-6MQ]Ta(Oar)₃(PMe₃) (24) can be prepared by simple coordination of PMe₃ to the base-free compounds 21 and 22. The quinoline ligand of [η²(N,C)-QUIN]Ta(Oar)₃ (21) is readily hydrogenated under mild reaction conditions to afford 1,2,3,4- tetrahydroquionline. When Ta(Oar)₂Cl₃(OEt₂) is reduced by one electron in the presence of QUIN or 6MQ, the d¹ bis(ligand) complexes [η¹(N)-6MQ]₂Ta(Oar)₂Cl₂ (26) and [η¹(N)- QUIN]₂Ta(OAr)₂Cl₂ (27) can be isolated. The relevance of these studies with respect to industrial hydrodenitrogenation (HDN) catalysis is discussed.
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Allpress, Caleb J. "Oxidative Aliphatic Carbon-Carbon Bond Cleavage Reactions." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/2003.

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The work presented in this dissertation has focused on synthesizing complexes of relevance to dioxygenase enzymes that oxidatively cleave aliphatic carbon-carbon bonds. The goal of this research was to elucidate mechanistic aspects of the activation of aliphatic carbon-carbon bonds towards cleavage by reaction with oxygen, and also investigate the regioselectivity of these reactions. The oxidative cleavage of a variety of enolizable substrates has been explored by utilizing several transition metal complexes supported by an aryl-appended tris(pyridylmethyl)amine ligand. In order to probe the widely-accepted “chelate hypothesis” for how changes in regiospecificity are achieved as a function of metal ion, we synthesized the compound [(6Ph2TPA)Fe(PhC(O)COHC(O)Ph)]OTf. Based on UV-vis and IR spectroscopy, the acireductone enolate was found to bind via a six-membered chelate ring. By comparison with the reactivity of [(6Ph2TPA)Ni(PhC(O)COHC(O)Ph)]ClO4, we determined that the chelate hypothesis was an insufficient explanation of the observed regioselectivity. Rather, ferrous ion-mediated hydration of a vicinal triketone intermediate was the key factor in determining the regioselectivity of the C-C cleavage reaction. We have developed a high-yielding synthetic route to protected precursors of C(1)H acireductones. Preparation of the complexes [(6Ph2TPA)M(PhC(O)COCHOC(O)CH3)]ClO4 (M = Fe, Ni) followed by judicious choice of deprotecting conditions allowed us to investigate the oxygen reactivity of a mono-nuclear complex with a dianionic acireductone substrate for the first time. This provides a promising strategy to continue investigations of complexes of relevance to the enzyme- substrate adduct of the acireductone dioxygenases. Divalent late first-row transition metal complexes have been used to investigate some new strategies for the activation of dioxygen and subsequent cleavage of C-C bonds. We have utilized photoreduction of a Ni(II) center to generate a highly O2-reactive Ni(I) fragment that leads to cleavage of a chloro-diketonate substrate. Additionally, we have found a Cu(II)-mediated thermal cleavage of chloro-diketonate substrates at room temperature. This reaction is interestingly accelerated by the addition of a catalytic amount of chloride ion.
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Dombrowski, James Michael. "Catalytic Cleavage of Carbon-Carbon Sigma Bonds Using Transition Metals." Thesis, Boston College, 2005. http://hdl.handle.net/2345/407.

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Thesis advisor: Lawrence T. Scott
The focus of this project was to probe the ability of various transition metal complexes to cleave carbon-carbon bonds in a C30H12 hemifullerene. The hemifullerene was synthesized in our lab from commercial 1-tetralone and bromonaphthalene in six steps. Palladium and nickel complexes were used to open the five membered rings along the periphery of the C30H12 bowl. Diphosphine complexes of nickel were capable of opening either all three five membered rings or one of the periphery five membered rings and the central six membered ring
Thesis (BS) — Boston College, 2005
Submitted to: Boston College. College of Arts and Sciences
Discipline: Chemistry
Discipline: College Honors Program
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Nicholls, Julian Charles. "Carbon-carbon bond cleavage in agostic cobalt complexes." Thesis, University of Salford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258557.

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King, Janice E. "Carbon-sulfur bond cleavage by environmental bacteria." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318772.

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Morris, A. D. "A study of carbon carbon bond cleavage in strained hydrocarbon systems." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47189.

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Wang, Jiaqi. "Transition Metal Catalyzed Oxidative Cleavage of C-O Bond." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801914/.

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The focus of this thesis is on C-O bonds activation by transition metal atoms. Lignin is a potential alternative energy resource, but currently is an underused biomass species because of its highly branched structure. To aid in better understanding this species, the oxidative cleavage of the Cβ-O bond in an archetypal arylglycerol β-aryl ether (β–O–4 Linkage) model compound of lignin with late 3d, 4d, and 5d metals was investigated. Methoxyethane was utilized as a model molecule to study the activation of the C-O bond. Binding enthalpies (ΔHb), enthalpy formations (ΔH) and activation enthalpies (ΔH‡) have been studied at 298K to learn the energetic properties in the C-O bond cleavage in methoxyethane. Density functional theory (DFT) has become a common choice for the transition metal containing systems. It is important to select suitable functionals for the target reactions, especially for systems with degeneracies that lead to static correlation effects. A set of 26 density functionals including eight GGA, six meta-GGA, six hybrid-GGA, and six hybrid-meta-GGA were applied in order to investigate the performance of different types of density functionals for transition metal catalyzed C-O bond cleavage. A CR-CCSD(T)/aug-cc-pVTZ was used to calibrate the performance of different density functionals.
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Johnson, Anne Elizabeth. "L-ribulose-5-phosphate 4-epimerase, epimerisation through carbon-carbon bond cleavage." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27169.pdf.

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Books on the topic "Carbon metal bond cleavage"

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Murakami, Masahiro, and Masahiro Murakami, eds. Cleavage of Carbon-Carbon Single Bonds by Transition Metals. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.

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Nicholls, Julian Charles. Carbon-carbon bond cleavage in agostic Cobalt complexes. Salford: University of Salford, 1989.

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Hartley, Frank R., and Saul Patai, eds. The Metal-Carbon Bond: Vol. 2 (1985). Chichester, UK: John Wiley & Sons, Ltd., 1985. http://dx.doi.org/10.1002/9780470771747.

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Hartley, Frank R., and Saul Patai, eds. The Metal-Carbon Bond: Vol. 3 (1985). Chichester, UK: John Wiley & Sons, Ltd., 1985. http://dx.doi.org/10.1002/9780470771754.

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Hartley, Frank R., ed. The Metal-Carbon Bond: Vol. 4 (1987). Chichester, UK: John Wiley & Sons, Inc., 1987. http://dx.doi.org/10.1002/9780470771778.

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Hartley, Frank R., ed. The Metal-Carbon Bond: Vol. 5 (1989). Chichester, UK: John Wiley & Sons, Inc., 1989. http://dx.doi.org/10.1002/9780470772263.

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Roberts, Stanley M., Jianliang Xiao, John Whittall, and Tom E. Pickett, eds. Catalysts for Fine Chemical Synthesis, Volume 3, Metal Catalysed Carbon-Carbon Bond-Forming Reactions. Chichester, UK: John Wiley & Sons, Ltd, 2004. http://dx.doi.org/10.1002/0470862017.

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R, Hartley F., and Patai Saul, eds. The Nature and cleavage of metal carbon bonds. Chichester: J. Wiley, 1985.

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Murakami, Masahiro, and Naoto Chatani. Cleavage of Carbon-Carbon Single Bonds by Transition Metals. Wiley & Sons, Limited, John, 2015.

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Murakami, Masahiro, and Naoto Chatani. Cleavage of Carbon-Carbon Single Bonds by Transition Metals. Wiley & Sons, Incorporated, John, 2015.

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Book chapters on the topic "Carbon metal bond cleavage"

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Murakami, Masahiro, and Naoki Ishida. "Fundamental Reactions to Cleave Carbon-Carbon σ-Bonds with Transition Metal Complexes." In Cleavage of Carbon-Carbon Single Bonds by Transition Metals, 1–34. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.ch1.

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Daub, Guido W. "Oxidatively Induced Cleavage of Transition Metal-Carbon Bonds." In Progress in Inorganic Chemistry, 409–23. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470166239.ch4.

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Murakami, Masahiro, and Naoki Ishida. "Total Syntheses of Natural Products and Biologically Active Compounds by Transition-Metal-Catalyzed C-C Cleavage." In Cleavage of Carbon-Carbon Single Bonds by Transition Metals, 253–72. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.ch8.

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Dahlenburg, Lutz. "Cleavage of the Carbon-Hydrogen Bond on Achiral and Chiral Transition Metal Complexes." In Organic Synthesis via Organometallics (OSM 4), 41–57. Wiesbaden: Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-84062-2_4.

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Tatsumi, Kazuyuki, and Hiroyuki Kawaguchi. "Carbon—Sulfur Bond Cleavage of Thiolates on Electron-Deficient Transition Metals." In ACS Symposium Series, 336–47. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0653.ch021.

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Tobisu, Mamoru. "Reactions via Cleavage of Carbon-Carbon Bonds of Ketones and Nitriles." In Cleavage of Carbon-Carbon Single Bonds by Transition Metals, 193–220. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.ch6.

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Matsuda, Takanori. "Reactions of Three-Membered Ring Compounds." In Cleavage of Carbon-Carbon Single Bonds by Transition Metals, 35–88. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.ch2.

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Matsuda, Takanori. "Reactions of Four-Membered Ring Compounds." In Cleavage of Carbon-Carbon Single Bonds by Transition Metals, 89–118. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.ch3.

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Satoh, Tetsuya, and Masahiro Miura. "Reactions Involving Elimination of CO2and Ketones." In Cleavage of Carbon-Carbon Single Bonds by Transition Metals, 119–64. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.ch4.

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Yorimitsu, Hideki. "Retro-allylation and Deallylation." In Cleavage of Carbon-Carbon Single Bonds by Transition Metals, 165–92. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527680092.ch5.

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Conference papers on the topic "Carbon metal bond cleavage"

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Yus, M., E. Alonso, J. Ferrandez, F. Foubelo, I. Gomez, D. Guijarro, A. Gutierrez, et al. "Arene-Catalysed Reductive Cleavage of the Benzylic Carbon-Sulfur Bond: Generation of Benzylic Lithium Reagents." In The 4th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2000. http://dx.doi.org/10.3390/ecsoc-4-01801.

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Dodson, Leah, J. Weber, and Michael Thompson. "BOND INSERTION IN METAL–CARBON DIOXIDE ANIONIC CLUSTERS STUDIED BY INFRARED PHOTODISSOCIATION 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.ra03.

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Franke, Daniel J., Justin D. Morrow, Neil A. Duffie, Michael Zinn, and Frank E. Pfefferkorn. "Towards Improved Hybrid Joining of Aluminum Alloys to Carbon Fiber Composites With Friction Stir Welding." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8747.

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The current methods for welding aluminum alloys to carbon fiber composites rely heavily on the adhesive bond created when a melted polymer solidifies in contact with the aluminum surface. This bond may be improved by achieving mechanical interlocking of the carbon fibers and the aluminum alloy, so that load bearing fibers contribute to the bond strength. Friction Stir Welding (FSW) holds potential as a process to achieve such interlocking by locally heating and plasticizing the metal under significant load to cause infiltration of the metal into the carbon fiber weave. During preliminary investigations, AA6061-T6 was friction stir welded in contact with dry carbon fiber bundles, and the infiltration of aluminum into the fibers was measured. The results were compared to an accepted polymer infiltration model that was adapted for aluminum infiltration, giving promising initial agreement. This suggests that the plasticized aluminum in FSW can be treated as a fluid with an effective viscosity, and that well established polymer infiltration models can form the base of a metal composite FSW model.
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Duncan, Andrew, Poh-Sang Lam, and Thad Adams. "Tensile Testing of Carbon Steel in High Pressure Hydrogen." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26736.

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An infrastructure of new and existing pipelines and systems will be required to carry and to deliver hydrogen as an alternative energy source under the hydrogen economy. Carbon and low alloy steels of moderate strength are currently used in hydrogen delivery systems as well as in the existing natural gas systems. It is critical to understand the material response of these standard pipeline materials when they are subjected to pressurized hydrogen environments. The methods and results from a testing program to quantify hydrogen effects on mechanical properties of carbon steel pipeline and pipeline weld materials are provided. Tensile properties of one type of steel (A106 Grade B) in base metal, welded and heat affected zone conditions were tested at room temperature in air and high pressure (10.34 MPa or 1500 psig) hydrogen. A general reduction in the materials ability to plastically deform was noted in this material when specimens were tested in hydrogen. Furthermore, the primary mode of fracture was changed from ductile rupture in air to cleavage with secondary tearing in hydrogen. The mechanical test results will be applied in future analyses to evaluate service life of the pipelines. The results are also envisioned to be part of the bases for construction codes and structural integrity demonstrations for hydrogen service pipeline and vessels.
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Roberts, Kendric, and Yen-Lin Han. "Investigating Density Functional Theory’s Effectiveness in Studying Metal-Organic Frameworks Structures." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11013.

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Abstract In combatting human induced climate change, carbon capture provides the potential to more slowly ease away from the dependence on hydrocarbon fuel sources, while mitigating the amount of CO2 released into the atmosphere. One promising material to use is metal-organic frameworks (MOF’s). MOF’s offer an immense variety in potential exceptionally porous structures, a property important in separation. As a result of practical experimental measurements being expensive and time consuming, interest in accomplishing the same goal through modeling has also increased. Using density functional theory to optimize the approximate experimentally measured atomic geometries has been shown to have sufficient accuracy. A previous study by Nazarian et al. was performed to optimize structures on the CoRE MOF Database using a supercomputer. The purpose of this study was to attempt to replicate their work done with a single MOF using computational resources more commonly available. Furthermore, as time tends to be the limiting factor in conducting these studies, the use of a smearing function was adjusted for two optimizations to see if any considerable improvement on the efficiency of the optimizations could be made. Our results show both optimizations improved the bond length accuracy relative to the raw data compared with the optimization from Nazarian, et al. The optimization with a more present smearing effect was able to converge the electron field in roughly half the time, while still showing nearly the same results, except for slightly more variability in the bond lengths involving transition metals. Unfortunately, the improvement in bond length, did not correspond in consistent improvement of the larger cell defining metrics. This shows that either a different energy minimum was found or the relationship between the larger cell parameters, with the more local parameters such as bond length is too complex for the method to effectively solve.
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6

Kumar, Anand, and Anchu Ashok. "Catalytic Decomposition of Ethanol over Bimetallic Nico Catalysts for Carbon Nanotube Synthesis." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0039.

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In this work we investigate the use of NiCo bimetal/oxide as catalyst for hydrogen production from ethanol, with a focus on the deactivation pattern and the nature of the observed carbon deposition. It is well known that sintering and coke deposition during decomposition reaction significantly reduces the activity of the catalysts at higher temperature, by blocking the active sites of the catalysts. During ethanol decomposition reaction, the cleavage of C-C bond produces adsorbed *CH4 and *CO species that further decompose to form carbonaceous compounds. FTIR in-situ analysis was conducted between 50 to 400°C for all the catalysts to understand the reaction mechanism and product selectivity. Cobalt was found to be selective for aldehyde and acetate, whereas bimetallic Ni-Co was selective for the formation of CO at 400°C along with aldehyde. Complete conversion of ethanol was observed at 350°C and 420°C for NiCo and Cobalt respectively indicating an improvement in the rate of conversion when Ni was added to cobalt. The crystallinity, morphology and particle analysis of the used catalyst after reaction were studied using XRD, SEM and TEM respectively. The XRD shows the complete phase change of porous NiCoO2 to NiCo alloy and SEM indicates the presence of fibrous structure on the surface with 91.7 % of carbon while keeping 1:1 ratio of Ni and Co after the reaction. The detailed analysis of carbon structure using HRTEM-STEM shows the simultaneous growth of carbon nano fibers (CNFs) and multiwalled carbon nanotubes (MWCNTs) that were favored on larger and smaller crystallites respectively. Analysis of carbon formation on individual Co catalyst and bimetallic NiCo catalyst shows a clear difference in the initiation pattern of carbon deposition. Metallic Co nanoparticles were found to be more mobile where Co disperses along the catalysts surface, whereas NiCo nanoparticles were relatively less mobile, and maintained their structure.
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Nguyen, Khe C., Sinh T. Do, and Thong V. De. "Novel Proton Exchange Membrane Utilizing Nano Composite for Fuel Cell Application." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17013.

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In the present report, we conducted the study of chemical top down process which seems to provide better efficiency and better cost saving than the physical top down in the fabrication of nano scale, especially, when applying to carbon materials. It is found that the chemical top down performs effectively with multiple attachments of electrolytic groups onto the surface of the carbon powder by diazo coupling reaction. As a result, we are able to isolate the nano scale of carbon particles with strong polar solvents such as water and believe that it is due to electrostatic repulsive force between same sign charges existing in the polarized electrolytic groups... The cleavage of azo bond in a naked carbon product can occur above 110oC in ambient condition but can also escape by a nano composite structure using specific emulsion polymer as binder matrix. Electrolytic groups carry charge from ionization are proven to reduce electron transport but enhance proton transport capability of carbon material, have successfully demonstrated a proton exchange membrane (PEM) which exhibits better heat resistance and higher current density than the commercial Nafion product in the PEM fuel cell application. The diazo coupling product of carbon exhibits a core-shell structure composed of a nano scale hydrophobic core and electrolytic shell, showing apparent “solubility” and named as “liquid” nano carbon (LNC).
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Varavallo, Rogério, Vitor de Melo Moreira, Vinicius Paes, Pedro Brito, José Olivas, and Haroldo Cavalcanti Pinto. "Microstructure and Residual Stress Analysis of Dissimilar Metal Composite Plates Produced by Explosion Welding." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24350.

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In the present work, different corrosion resistant materials (AL-6XN superaustenitic stainless steel, ZERON 100 superduplex stainless steel and Inconel 625 Ni alloy) were joined with ASME SA516-70 carbon steel by explosion welding to form bimetal composite plates. The microstructure of cladded plates was characterized by optical and scanning electron microscopy and the hardness variation across the interface was determined by applying Vickers microhardness. The residual stresses generated by the cladding process were determined by X-ray diffraction. All materials adhered well to the ASME SA516-70 base plate and the cladded interface exhibited the wavy morphology usually associated with strong bond strengths. Hardness increased near the interface due to strain hardening caused by plastic deformation and tensile residual stresses were found to develop on all clad metals.
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Lima, C. R. C., U. Senturk, R. S. Lima, and C. C. Berndt. "Thermal Conductivity Behavior of Sol-Gel Post-Treated Thermal Barrier Coatings." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p1057.

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Abstract Thermal barrier coatings have been extensively used in several industrial segments. The material used as an insulator in such systems has been partially stabilized zirconia (PSZ) plasma sprayed over a metallic bond coat layer. The ceramic layer is usually porous, thus improving insulation properties. The porosity also increases gas permeability and, therefore, reduces oxidation resistance of the coating. Post-treatments have been applied to reduce the open porosity and improve oxidation resistance. In this work thermal barrier coatings were applied on low carbon steel substrates using two sets of bond coat, i.e., metallic and metal-ceramic. The metallic bond coat was NiCrAlY. The metal-ceramic bond coat was a mixture of NiCrAlY and 8% yttria partially stabilized zirconia, which were applied by simultaneous feeding to the plasma torch from two powder feeders. A sol-gel method was employed to impregnate the porous ceramic top coat with alumina or zirconia. The samples in the as-sprayed and post-treated condition were characterized using mercury intrusion porosimetry (MIP), thermal conductivity. KEY WORDS: Thermal Conductivity, TBCs, Sol-Gel.
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Mally, Timothy S., Michael W. Keller, and Roger H. Walker. "The Effect of Different Types of Surface Preparation on Lap Shear Strength of a Typical Ambient Cured Carbon Fiber Composite Repair System." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97497.

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A crucial factor in a composite repair installation is the degree of surface preparation that is available. The surface profile that is created is directly proportional to the bond strength of the composite repair to the substrate. A NACE-2 near-white metal sandblast is ideal surface preparation for a composite repair. However, this degree of surface preparation is not available for every installation for various reasons. As a result, this paper details the effects of several different kinds of surface preparation on composite bond strength. Details are presented for the lap shear testing of a carbon fiber reinforced polymer (CFRP) according to ASTM D5868. Five different surface preparation techniques are tested, including NACE-2 sandblast, bristle blast, wire brush, carbide grinder, and sand paper. The testing is used to calculate the necessary degree of surface preparation required to sustain an acceptable field repair. Test samples are fabricated according to the ASTM standard, and are tensile tested on an MTI-5K tensile machine. The lap shear values are compared to acceptable values required in the ASME Post Construction Code 2. Industry experience is also considered as it is determined whether these surface preparation methods are acceptable for in-situ composite repair.
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Reports on the topic "Carbon metal bond cleavage"

1

Frost, J. W. Biotic and abiotic carbon to sulfur bond cleavage. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5474561.

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Frost, J. W. Biotic and abiotic carbon to sulfur bond cleavage. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5215659.

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3

Frost, J. W. Biotic and abiotic carbon to sulfur bond cleavage. Final report. Office of Scientific and Technical Information (OSTI), May 1994. http://dx.doi.org/10.2172/10150691.

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4

Kayser, K. J., B. A. Bielaga, K. Jackowski, O. Oduson, and J. II Kilbane. Characterization of carbon-sulfur bond cleavage by axenic and mixed cultures of Rhodococcus rhodochrous IGTS8. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/10177078.

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5

Frost, J. W. Biotic and abiotic carbon to sulfur bond cleavage. Technical report, July 1, 1991--September 30, 1991. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10139558.

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6

Jayatissa, Kuruppu. A Metal-Free Approach to Biaryl Compounds: Carbon-Carbon Bond Formation from Diaryliodonium Salts and Aryl Triolborates. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2226.

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7

Goldman, Alan S. FINAL TECHNICAL REPORT for grant DE-FG02-93ER14353 "Carbon-Hydrogen Bond Functionalization Catalyzed by Transition Metal Systems". Office of Scientific and Technical Information (OSTI), May 2012. http://dx.doi.org/10.2172/1040722.

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8

Goldman, Alan S. Final Report: Carbon-Hydrogen Bond Functionalization Catalyzed by Transition Metal Systems, June 1, 1990 - May 31, 1993. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/764582.

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[Studies of hydrogen-hydrogen and carbon-sulfur bond cleavage; Lewis acid modified molybdenum sulfide complexes; and Syntheses and reactions of pyrrole complexes]. Final report. Office of Scientific and Technical Information (OSTI), January 1998. http://dx.doi.org/10.2172/650154.

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