Bibliografías temáticas / Homolysis

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Literatura académica sobre el tema "Homolysis"

Autor: Grafiati
Publicado: 25 de mayo de 2024
Última modificación: 31 de julio de 2025

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Artículos de revistas sobre el tema "Homolysis"

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Zhang, Chen, Junxia Pi, Shu Chen, Ping Liu, and Peipei Sun. "Construction of a 4H-pyrido[4,3,2-gh]phenanthridin-5(6H)-one skeleton via a catalyst-free radical cascade addition/cyclization using azo compounds as radical sources." Organic Chemistry Frontiers 5, no. 5 (2018): 793–96. http://dx.doi.org/10.1039/c7qo00926g.

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The new radical addition/cyano insertion/homolytic aromatic substitution cascade reaction initiated by the thermal homolysis of azo compounds under catalyst-free conditions produced polycyclic phenanthridine derivatives.
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2

Shin, Jeongcheol, Jiseon Lee, Jong-Min Suh, and Kiyoung Park. "Ligand-field transition-induced C–S bond formation from nickelacycles." Chemical Science 12, no. 48 (2021): 15908–15. http://dx.doi.org/10.1039/d1sc05113j.

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d–d excitations can accelerate C–S reductive eliminations of nickelacycles via intersystem crossing to a repulsive 3(C-to-Ni charge transfer) state inducing Ni–C bond homolysis. This homolytic photoreactivity is common for organonickel(ii) complexes.
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3

Qianzhu, Haocheng, Wenjuan Ji, Xinjian Ji, et al. "Reactivity of the nitrogen-centered tryptophanyl radical in the catalysis by the radical SAM enzyme NosL." Chemical Communications 53, no. 2 (2017): 344–47. http://dx.doi.org/10.1039/c6cc08869d.

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The nitrogen-centered tryptophanyl radical produced by the radical SAM enzyme NosL can undergo both Cα–Cβ and Cα–C homolytic cleavages, and we show that the Cα–Cβ homolysis is energetically more favorable. The kinetics of NosL catalysis are also reported in this Communication.
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4

Ishihara, Koji, and Thomas Wilson Swaddle. "The pressure dependence of rates of homolytic fission of metal–ligand bonds in aqueous solution." Canadian Journal of Chemistry 64, no. 11 (1986): 2168–70. http://dx.doi.org/10.1139/v86-356.

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The volume of activation for the exclusively homolytic decomposition of protonated 4-pyridylmethylchromium(III) ion in aqueous HClO4 at 63.4 °C is +19 cm3 mol−1, with negligible dependence on pressure up to 350 MPa at least. The origins of the strongly positive volumes of activation that characterize homolysis of complex cations in aqueous solution are examined.
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Yorimitsu, Hideki. "Homolytic substitution at phosphorus for C–P bond formation in organic synthesis." Beilstein Journal of Organic Chemistry 9 (June 28, 2013): 1269–77. http://dx.doi.org/10.3762/bjoc.9.143.

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Organophosphorus compounds are important in organic chemistry. This review article covers emerging, powerful synthetic approaches to organophosphorus compounds by homolytic substitution at phosphorus with a carbon-centered radical. Phosphination reagents include diphosphines, chalcogenophosphines and stannylphosphines, which bear a weak P–heteroatom bond for homolysis. This article deals with two transformations, radical phosphination by addition across unsaturated C–C bonds and substitution of organic halides.
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6

Cameron, Dale R., Alison M. P. Borrajo, Gregory R. J. Thatcher, and Brian M. Bennett. "Organic nitrates, thionitrates, peroxynitrites, and nitric oxide: a molecular orbital study of the (X = O, S) rearrangement, a reaction of potential biological significance." Canadian Journal of Chemistry 73, no. 10 (1995): 1627–38. http://dx.doi.org/10.1139/v95-202.

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The rearrangement of organic thionitrate to sulfenyl nitrite potentially mediates the release of nitric oxide from organic nitrates, such as nitroglycerin, in the presence of thiol. The biological activity of these nitrovasodilators is proposed to result from release of nitric oxide in vivo. The thionitrate rearrangement bears analogy to the rearrangement of peroxynitrous acid to nitric acid, which has been proposed to mediate the biological toxicity of nitric oxide and superoxide. In this paper, the two concerted rearrangement processes and competing homolytic reactions are explored using mol
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Edeleva, Mariya, Gerard Audran, Sylvain Marque, and Elena Bagryanskaya. "Smart Control of Nitroxide-Mediated Polymerization Initiators’ Reactivity by pH, Complexation with Metals, and Chemical Transformations." Materials 12, no. 5 (2019): 688. http://dx.doi.org/10.3390/ma12050688.

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Because alkoxyamines are employed in a number of important applications, such as nitroxide-mediated polymerization, radical chemistry, redox chemistry, and catalysis, research into their reactivity is especially important. Typically, the rate of alkoxyamine homolysis is strongly dependent on temperature. Nonetheless, thermal regulation of such reactions is not always optimal. This review describes various ways to reversibly change the rate of C–ON bond homolysis of alkoxyamines at constant temperature. The major methods influencing C–ON bond homolysis without alteration of temperature are prot
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Shu, Xing-Zhong, and Xiaobo Pang. "Titanium: A Unique Metal for Radical Dehydroxylative Functionalization of Alcohols." Synlett 32, no. 13 (2021): 1269–74. http://dx.doi.org/10.1055/a-1406-0484.

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AbstractThe dehydroxylative functionalization of alcohols is synthetic appealing, but it remains a long-term challenge in the synthetic community. Low-valent titanium has shown the power to produce carbon radicals from alcohols via homolytic cleavage of the C–OH bonds and thus offers the potential to overcome this problem. In this perspective manuscript, we summarized the recent advance on radical dehydroxylative transformation of alcohols either promoted or catalyzed by titanium. The limitation and outlook of the studies in this field are also provided.1 Introduction2 Recent Developments in D
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9

Philip, R. D. Murray, H. Cox James, D. Chiapinni Nicholas, et al. "Photochemical and Electrochemical Applications of Proton-Coupled Electron Transfer in Organic Synthesis." Chemical Review 122 (November 23, 2021): 2017–291. https://doi.org/10.5281/zenodo.7296738.

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We present here a review of the photochemical and electrochemical applications of multi-site proton-coupled electron transfer (MS-PCET) in organic synthesis. MS-PCETs are redox mechanisms in which both an electron and a proton are exchanged together, often in a concerted elementary step. As such, MS-PCET can function as a non-classical mechanism for homolytic bond activation, providing opportunities to generate synthetically useful free radical intermediates directly from a wide variety of common organic functional groups. We present an introduction to MS-PCET and a practitioner’s guide
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Koppenol, Willem H., and Reinhard Kissner. "Can ONOOH Undergo Homolysis?" Chemical Research in Toxicology 11, no. 2 (1998): 87–90. http://dx.doi.org/10.1021/tx970200x.

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Tesis sobre el tema "Homolysis"

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Marquess, Daniel. "Studies on the insertion-homolysis mechanism for carbon-sulphur bond formation in penicillin biosynthesis." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306548.

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Helling, Christoph [Verfasser], and Stephan [Akademischer Betreuer] Schulz. "Pnictogen–Carbon Bond Homolysis : an approach to the synthesis of group 13 metal-substituted pnictanyl radicals / Christoph Helling ; Betreuer: Stephan Schulz." Duisburg, 2021. http://d-nb.info/123491123X/34.

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Havot, Jeffrey. "Synthèse et étude d'alcoxyamines inédites : de la théranostique à l'activation par résonnance plasmonique." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0080.

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Les alcoxyamines sont des molécules connues pour leur capacité à produire des radicaux via l’homolyse de leur liaison C-ON. Cette homolyse peut être produite par diverses méthodes d’activation, comme par voie thermique, photocatalysée ou encore enzymatique. De plus, il est possible de modifier leur structure de manière exhaustive, afin d’en modifier les propriétés. Toutes ces possibilités permettent d’envisager pour cette famille de composés de nombreuses applications dans des domaines extrêmement variés. Cette thèse présente la synthèse et l’étude physico-chimique d’un certain nombre d’alcoxy
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4

Robertson, Jeremy. "Ring expansion reaction via homolytic pathways." Thesis, University of Oxford, 1990. http://ora.ox.ac.uk/objects/uuid:194ca194-4848-470b-a21f-c16869257b96.

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The preparation of carbocyclic medium rings by two electron processes is reviewed with particular reference to the synthesis of natural products. The formation of medium rings by oxidative and homolytic methods is also reviewed. The synthesis and behaviour of both cis- and tran- ring expansion precursors is described. The 1,4-addition of tributylstannyl lithium to a range of cyclic α,β-unsaturated ketones was performed and procedures found whereby the so-formed enolates could be alkylated with a variety of electrophiles. Using these procedures a range of trans- ring expansion precursors were o
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5

Spratley, A. "Some studies of the homolytic reactions of chlorinated benzenes." Thesis, City University London, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355587.

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Norberg, Daniel. "Quantum Chemical Studies of Radical Cation Rearrangement, Radical Carbonylation, and Homolytic Substitution Reactions." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8178.

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Carré, Christiane. "Étude des réactions photoinduites de l'octahydro-1,2,3,4,6,7,8,9 phénazine en solution ou la voie des diazines vers la photo-homolyse de l'eau." Paris 11, 1985. http://www.theses.fr/1985PA112084.

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Certaines diazines-1,4 - en particulier la phénazine – sont susceptibles de provoquer la photo-homolyse de l’eau. Ce travail porte sur les réactions photoinduites de l’octahydro-1,2,3,4,6,7,8,9 phénazine. Après étude par R. P. E. Des diverses espèces radicalaires formées par transfert d’un électron sur cette molécule, nous avons pu montrer que par irradiation des solutions d’octahydrophénazine dans l’eau ou dans l’alcool, c’est le radical cation qui se forme très rapidement : il résulte de l’arrachement d’un atome d’hydrogène par la molécule monoprotonée excitée. C’est surtout l’octahydrophéna
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8

Ni, Liming. "Synthesis and evaluation of new peptidyl phosphonate analogs of benzamidine, lysine and homolysine as irreversible inhibitors for thrombin and other trypsin-like enzymes." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/27080.

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Lingua, Hugo. "SH2 sur les dialkylzincs par les radicaux α-alcoxycarbonyle, carbozincations et additions radicalaires impliquant des ynamides : approches expérimentales et théoriques". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0564.

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La réactivité de l’α-bromoacrylate d’éthyle et du benzylidène malonate d’éthyle vis à vis des dialkylzincs en milieu aérobie a été étudiée afin d’évaluer la capacité des radicaux α-alcoxycarbonyle tertiaires à évoluer par SH2 sur le métal pour conduire à un énolate de zinc. Le travail expérimental réalisé à partir de l’α-bromoacrylate d’éthyle a permis la synthèse de cyclopropanes et de céto-esters. Dans le cas des benzylidène malonates la réversibilité de l’addition du diéthylzinc sur le substrat, a été mise en évidence. L’effet inhibiteur d’additifs tels que TMSCl ou CuCl concourt à indiquer
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10

Vallet, Anne-Laure. "Réactivités de NHC-Boranes Soufrés." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112261.

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Avec le développement des concepts de la chimie verte, il est devenu nécessaire de remplacer les métaux toxiques par des composés plus respectueux de l’environnement. Donneurs d’hydrogène pour des réactions radicalaires, les hydrures de trialkylétain sont encore très utilisés. Les NHC-boranes se sont révélés de bons remplaçants pour les réactions de désoxygénation. Cependant, les réactions de déshalogénation effectuées avec des NHC-boranes sont moins efficaces et il a fallu avoir recours au concept de catalyse à polarité inversée. Ces travaux ont été le point de départ de cette thèse où la syn
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Libros sobre el tema "Homolysis"

1

Turovsʹkyĭ, A. A. Non-valency interaction in organic peroxides homolysis reactions. Nova Science Publishers, 2011.

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2

(Editor), Gennadii Efremovich Zaikov, Yu B. Monakov (Editor), Alfonso Jimenez (Editor), and Iu B. Monakov (Editor), eds. Homolytic and Heterolytic Reactions: Problems and Solutions. Nova Science Publishers, 2004.

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Homolytic Aromatic Substitution: International Series of Monographs on Organic Chemistry. Elsevier Science & Technology Books, 2014.

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Capítulos de libros sobre el tema "Homolysis"

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Cleaves, Henderson James. "Homolysis." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_733-3.

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Cleaves, Henderson James. "Homolysis." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_733.

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Cleaves, Henderson James. "Homolysis." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_733.

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Cleaves II, Henderson James. "Homolysis." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_733.

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Cleaves II, Henderson James. "Homolysis." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-27833-4_733-4.

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Antal, Michael Jerry, Andrew Brittain, Carlos DeAlmeida, Sundaresh Ramayya, and Jiben C. Roy. "Heterolysis and Homolysis in Supercritical Water." In ACS Symposium Series. American Chemical Society, 1987. http://dx.doi.org/10.1021/bk-1987-0329.ch007.

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Stein, Stephen E., and Mahendra M. Suryan. "Homolysis of Substituted Anisoles: Substituent Effects on Phenoxyl Radical Stabilities." In Oxygen Radicals in Biology and Medicine. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-5568-7_15.

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Fink, Richard G. "Coenzyme B12-Based Chemical Precedent for Co-C Bond Homolysis and Other Key Elementary Steps." In Vitamin B12and B12-Proteins. Wiley-VCH Verlag GmbH, 2007. http://dx.doi.org/10.1002/9783527612192.ch25.

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9

Rossi, Roberto A., María E. Budén, and Javier F. Guastavino. "Homolytic Aromatic Substitution." In Arene Chemistry. John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781118754887.ch9.

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Halpern, J. "Homolytic Ligand Dissociation." In Inorganic Reactions and Methods. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145319.ch5.

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Actas de conferencias sobre el tema "Homolysis"

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Tumanov, Vladimir Evgen'vich, and Andrei Ivanovich Prokhorov. "Web database on bond dissociation energies of organic compounds." In 23rd Scientific Conference “Scientific Services & Internet – 2021”. Keldysh Institute of Applied Mathematics, 2021. http://dx.doi.org/10.20948/abrau-2021-21.

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The article presents a scientific service on the Internet "Bond Dissociation Energies of Organic Compounds Database". This web database contains experimental values of dissociation energies of homolytic bonds. The service is intended for use by a wide range of chemists, theorists and practitioners in the open access on the Internet. The paper provides a brief overview of the literature sources of the dissociation energies of bonds of organic molecules, which are calculated theoretically, measured experimentally and estimated from kinetic and thermochemical experimental data. Descriptions of ex
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2

Jeremić, Svetlana R., Jelena R. Đorović Jovanović, Marijana S. Stanojević Pirković, and Zoran S. Marković. "THERMODYNAMICALLY INVESTIGATIONS OF FREE RADICAL SCAVENGER POTENCY OF 1,2,4-TRIHYDROXYTHIOXANTHONE." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.414j.

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The operative mechanism of the antioxidative action of 1,2,4-trihydroxythioxanthone (TX) is investigated in this contribution. Conclusions are made based on enthalpy values, as thermodynamical parameters. All calculations are done using the M06-2X/6-311++G(d,p) level of theory. To imitate polar and non-polar environments, calculations are done in water and benzene as the medium. It is found that, among three possible radicals that TX can generate, the most stable is the one obtained by homolytic cleavage of the O-H group in position 4. It was found that HAT (Hydrogen Atom Transfer) is the most
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3

Rahman, Sheikh Tareq, Keshab K.Adhikary, and Philippe M. Heynderickx. "Gas phase hydroxylation of benzene to phenol by using CO2 as an oxidant over Cu-exchanged ZSM-5 catalysts." In 5th World Conference on Chemistry and Chemical Engineering and 5th World Conference on Advanced Materials, Nanoscience and Nanotechnology. Eurasia Conferences, 2024. https://doi.org/10.62422/978-81-970328-7-5-025.

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Direct hydroxylation of benzene is an assuring strategy to synthesize phenol. Formation of phenol was achieved under the continuous flow micro-reactor system by the concurrent feed of benzene and carbon dioxide over Cu loaded M+-ZSM-5 catalysts (M = Na+, Cs+, Mg2+ Ca2+ and Cr3+). The formation of phenol was observed (9.5% at 450 0C) in the temperature range of 4250C–5250C with a co-feed of CO2 (15 mL/min) and C6H6 (0.8 mL/min). When the catalyst was calcined at 450 0C, the activity peaked in the first hour and then slowly deactivated, but when the calcination temperature for the synthesized ca
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Informes sobre el tema "Homolysis"

1

Lee, Shaoyung. Kinetic study of the reaction of ferrocenes and ferrocenium ions with ground and excited states of tris(2,2-bipyridine)chromium ions and the preparation and homolysis of organocobalt complexes. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6835414.

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Heinekey, D. M. Homolytic activation of hydrocarbons and hydrogen by persistent metal radicals. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/6716196.

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Heinekey, D. M. Homolytic activation of hydrocarbons and hydrogen by persistent metal radicals. Progress report, January 1, 1992--November 1, 1992. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10136755.

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[Homolytic activation of hydrocarbons and hydrogen by persistent radicals]. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/6837370.

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[Homolytic activation of hydrocarbons and hydrogen by persistent radicals]. Final report. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10122867.

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